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refrigeration</title> <meta name="description" content="Search results for: solid state refrigeration"> <meta name="keywords" content="solid state refrigeration"> <meta name="viewport" content="width=device-width, initial-scale=1, minimum-scale=1, maximum-scale=1, user-scalable=no"> <meta charset="utf-8"> <link href="https://cdn.waset.org/favicon.ico" type="image/x-icon" rel="shortcut icon"> <link href="https://cdn.waset.org/static/plugins/bootstrap-4.2.1/css/bootstrap.min.css" rel="stylesheet"> <link href="https://cdn.waset.org/static/plugins/fontawesome/css/all.min.css" rel="stylesheet"> <link href="https://cdn.waset.org/static/css/site.css?v=150220211555" rel="stylesheet"> </head> <body> <header> <div class="container"> <nav class="navbar navbar-expand-lg navbar-light"> <a class="navbar-brand" href="https://waset.org"> <img src="https://cdn.waset.org/static/images/wasetc.png" alt="Open Science Research Excellence" title="Open Science Research Excellence" /> </a> <button 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action="https://publications.waset.org/abstracts/search"> <div id="custom-search-input"> <div class="input-group"> <i class="fas fa-search"></i> <input type="text" class="search-query" name="q" placeholder="Author, Title, Abstract, Keywords" value="solid state refrigeration"> <input type="submit" class="btn_search" value="Search"> </div> </div> </form> </div> </div> <div class="row mt-3"> <div class="col-sm-3"> <div class="card"> <div class="card-body"><strong>Commenced</strong> in January 2007</div> </div> </div> <div class="col-sm-3"> <div class="card"> <div class="card-body"><strong>Frequency:</strong> Monthly</div> </div> </div> <div class="col-sm-3"> <div class="card"> <div class="card-body"><strong>Edition:</strong> International</div> </div> </div> <div class="col-sm-3"> <div class="card"> <div class="card-body"><strong>Paper Count:</strong> 9192</div> </div> </div> </div> <h1 class="mt-3 mb-3 text-center" style="font-size:1.6rem;">Search results for: solid state refrigeration</h1> <div class="card paper-listing mb-3 mt-3"> <h5 class="card-header" style="font-size:.9rem"><span class="badge badge-info">9192</span> Design of Advanced Materials for Alternative Cooling Devices</h5> <div class="card-body"> <p class="card-text"><strong>Authors:</strong> <a href="https://publications.waset.org/abstracts/search?q=Emilia%20Olivos">Emilia Olivos</a>, <a href="https://publications.waset.org/abstracts/search?q=R.%20Arroyave"> R. Arroyave</a>, <a href="https://publications.waset.org/abstracts/search?q=A.%20Vargas-Calderon"> A. Vargas-Calderon</a>, <a href="https://publications.waset.org/abstracts/search?q=J.%20E.%20Dominguez-Herrera"> J. E. Dominguez-Herrera</a> </p> <p class="card-text"><strong>Abstract:</strong></p> More efficient cooling systems are needed to reduce building energy consumption and environmental impact. At present researchers focus mainly on environmentally-friendly magnetic materials and the potential application in cooling devices. The magnetic materials presented in this project belong to a group known as Heusler alloys. These compounds are characterized by a strong coupling between their structure and magnetic properties. Usually, a change in one of them can alter the other, which implies changes in other electronic or structural properties, such as, shape magnetic memory response or the magnetocaloric effect. Those properties and its dependence with external fields make these materials interesting, both from a fundamental point of view, as well as on their different possible applications. In this work, first principles and Monte Carlo simulations have been used to calculate exchange couplings and magnetic properties as a function of an applied magnetic field on Heusler alloys. As a result, we found a large dependence of the magnetic susceptibility, entropy and heat capacity, indicating that the magnetic field can be used in experiments to trigger particular magnetic properties in materials, which are necessary to develop solid-state refrigeration devices. <p class="card-text"><strong>Keywords:</strong> <a href="https://publications.waset.org/abstracts/search?q=ferromagnetic%20materials" title="ferromagnetic materials">ferromagnetic materials</a>, <a href="https://publications.waset.org/abstracts/search?q=magnetocaloric%20effect" title=" magnetocaloric effect"> magnetocaloric effect</a>, <a href="https://publications.waset.org/abstracts/search?q=materials%20design" title=" materials design"> materials design</a>, <a href="https://publications.waset.org/abstracts/search?q=solid%20state%20refrigeration" title=" solid state refrigeration"> solid state refrigeration</a> </p> <a href="https://publications.waset.org/abstracts/108024/design-of-advanced-materials-for-alternative-cooling-devices" class="btn btn-primary btn-sm">Procedia</a> <a href="https://publications.waset.org/abstracts/108024.pdf" target="_blank" class="btn btn-primary btn-sm">PDF</a> <span class="bg-info text-light px-1 py-1 float-right rounded"> Downloads <span class="badge badge-light">215</span> </span> </div> </div> <div class="card paper-listing mb-3 mt-3"> <h5 class="card-header" style="font-size:.9rem"><span class="badge badge-info">9191</span> Solid-State Sodium Conductor for Solid-State Battery</h5> <div class="card-body"> <p class="card-text"><strong>Authors:</strong> <a href="https://publications.waset.org/abstracts/search?q=Yumei%20Wang">Yumei Wang</a>, <a href="https://publications.waset.org/abstracts/search?q=Xiaoyu%20Xu"> Xiaoyu Xu</a>, <a href="https://publications.waset.org/abstracts/search?q=Li%20Lu"> Li Lu</a> </p> <p class="card-text"><strong>Abstract:</strong></p> Solid-state battery adopts solid-state electrolyte such as oxide- and composite-based solid electrolytes. With the adaption of nonflammable or less flammable solid electrolytes, the safety of solid-state batteries can be largely increased. NASICON (Na₃Zr₂Si₂PO₁₂, NZSP) is one of the sodium ion conductors that possess relatively high ionic conductivity, wide electrochemical stable range and good chemical stability. Therefore, it has received increased attention. We report the development of high-density NZSP through liquid phase sintering and its organic-inorganic composite electrolyte. Through reactive liquid phase sintering, the grain boundary conductivity can be largely enhanced while using an organic-inorganic composite electrolyte, interfacial wetting and impedance can be largely reduced hence being possible to fabricate scalable solid-state batteries. <p class="card-text"><strong>Keywords:</strong> <a href="https://publications.waset.org/abstracts/search?q=solid-state%20electrolyte" title="solid-state electrolyte">solid-state electrolyte</a>, <a href="https://publications.waset.org/abstracts/search?q=composite%20electrolyte" title=" composite electrolyte"> composite electrolyte</a>, <a href="https://publications.waset.org/abstracts/search?q=electrochemical%20performance" title=" electrochemical performance"> electrochemical performance</a>, <a href="https://publications.waset.org/abstracts/search?q=conductivity" title=" conductivity"> conductivity</a> </p> <a href="https://publications.waset.org/abstracts/169003/solid-state-sodium-conductor-for-solid-state-battery" class="btn btn-primary btn-sm">Procedia</a> <a href="https://publications.waset.org/abstracts/169003.pdf" target="_blank" class="btn btn-primary btn-sm">PDF</a> <span class="bg-info text-light px-1 py-1 float-right rounded"> Downloads <span class="badge badge-light">123</span> </span> </div> </div> <div class="card paper-listing mb-3 mt-3"> <h5 class="card-header" style="font-size:.9rem"><span class="badge badge-info">9190</span> Energy Interaction among HVAC and Supermarket Environment</h5> <div class="card-body"> <p class="card-text"><strong>Authors:</strong> <a href="https://publications.waset.org/abstracts/search?q=Denchai%20Woradechjumroen">Denchai Woradechjumroen</a>, <a href="https://publications.waset.org/abstracts/search?q=Haorong%20Li"> Haorong Li</a>, <a href="https://publications.waset.org/abstracts/search?q=Yuebin%20Yu"> Yuebin Yu</a> </p> <p class="card-text"><strong>Abstract:</strong></p> Supermarkets are the most electricity-intensive type of commercial buildings. The unsuitable indoor environment of a supermarket provided by abnormal HVAC operations incurs waste energy consumption in refrigeration systems. This current study briefly describes significantly solid backgrounds and proposes easy-to-use analysis terminology for investigating the impact of HVAC operations on refrigeration power consumption using the field-test data obtained from building automation system (BAS). With solid backgrounds and prior knowledge, expected energy interactions between HVAC and refrigeration systems are proposed through Pearson’s correlation analysis (R value) by considering correlations between equipment power consumption and dominantly independent variables (driving force conditions). The R value can be conveniently utilized to evaluate how strong relations between equipment operations and driving force parameters are. The calculated R values obtained from field data are compared to expected ranges of R values computed by energy interaction methodology. The comparisons can separate the operational conditions of equipment into faulty and normal conditions. This analysis can simply investigate the condition of equipment operations or building sensors because equipment could be abnormal conditions due to routine operations or faulty commissioning processes in field tests. With systematically solid and easy-to-use backgrounds of interactions provided in the present article, the procedures can be utilized as a tool to evaluate the proper commissioning and routine operations of HVAC and refrigeration systems to detect simple faults (e.g. sensors and driving force environment of refrigeration systems and equipment set-point) and optimize power consumption in supermarket buildings. Moreover, the analysis will be used to further study FDD research for supermarkets in future. <p class="card-text"><strong>Keywords:</strong> <a href="https://publications.waset.org/abstracts/search?q=energy%20interaction" title="energy interaction">energy interaction</a>, <a href="https://publications.waset.org/abstracts/search?q=HVAC" title=" HVAC"> HVAC</a>, <a href="https://publications.waset.org/abstracts/search?q=R-value" title=" R-value"> R-value</a>, <a href="https://publications.waset.org/abstracts/search?q=supermarket%20buildings" title=" supermarket buildings"> supermarket buildings</a> </p> <a href="https://publications.waset.org/abstracts/17404/energy-interaction-among-hvac-and-supermarket-environment" class="btn btn-primary btn-sm">Procedia</a> <a href="https://publications.waset.org/abstracts/17404.pdf" target="_blank" class="btn btn-primary btn-sm">PDF</a> <span class="bg-info text-light px-1 py-1 float-right rounded"> Downloads <span class="badge badge-light">428</span> </span> </div> </div> <div class="card paper-listing mb-3 mt-3"> <h5 class="card-header" style="font-size:.9rem"><span class="badge badge-info">9189</span> Modeling and Performance Evaluation of Three Power Generation and Refrigeration Energy Recovery Systems from Thermal Loss of a Diesel Engine in Different Driving Conditions</h5> <div class="card-body"> <p class="card-text"><strong>Authors:</strong> <a href="https://publications.waset.org/abstracts/search?q=H.%20Golchoobian">H. Golchoobian</a>, <a href="https://publications.waset.org/abstracts/search?q=M.%20H.%20Taheri"> M. H. Taheri</a>, <a href="https://publications.waset.org/abstracts/search?q=S.%20Saedodin"> S. Saedodin</a>, <a href="https://publications.waset.org/abstracts/search?q=A.%20Sarafraz"> A. Sarafraz</a> </p> <p class="card-text"><strong>Abstract:</strong></p> This paper investigates the possibility of using three systems of organic Rankine auxiliary power generation, ejector refrigeration and absorption to recover energy from a diesel car. The analysis is done for both urban and suburban driving modes that vary from 60 to 120 km/h. Various refrigerants have also been used for organic Rankine and Ejector refrigeration cycles. The capacity was evaluated by Organic Rankine Cycle (ORC) system in both urban and suburban conditions for cyclopentane and ammonia as refrigerants. Also, for these two driving plans, produced cooling by absorption refrigeration system under variable ambient temperature conditions and in ejector refrigeration system for R123, R134a and R141b refrigerants were investigated. <p class="card-text"><strong>Keywords:</strong> <a href="https://publications.waset.org/abstracts/search?q=absorption%20system" title="absorption system">absorption system</a>, <a href="https://publications.waset.org/abstracts/search?q=diesel%20engine" title=" diesel engine"> diesel engine</a>, <a href="https://publications.waset.org/abstracts/search?q=ejector%20refrigeration" title=" ejector refrigeration"> ejector refrigeration</a>, <a href="https://publications.waset.org/abstracts/search?q=energy%20recovery" title=" energy recovery"> energy recovery</a>, <a href="https://publications.waset.org/abstracts/search?q=organic%20Rankine%20cycle" title=" organic Rankine cycle"> organic Rankine cycle</a> </p> <a href="https://publications.waset.org/abstracts/113865/modeling-and-performance-evaluation-of-three-power-generation-and-refrigeration-energy-recovery-systems-from-thermal-loss-of-a-diesel-engine-in-different-driving-conditions" class="btn btn-primary btn-sm">Procedia</a> <a href="https://publications.waset.org/abstracts/113865.pdf" target="_blank" class="btn btn-primary btn-sm">PDF</a> <span class="bg-info text-light px-1 py-1 float-right rounded"> Downloads <span class="badge badge-light">235</span> </span> </div> </div> <div class="card paper-listing mb-3 mt-3"> <h5 class="card-header" style="font-size:.9rem"><span class="badge badge-info">9188</span> Sustainable Refrigerated Transport Engineering</h5> <div class="card-body"> <p class="card-text"><strong>Authors:</strong> <a href="https://publications.waset.org/abstracts/search?q=A.%20A">A. A</a>, <a href="https://publications.waset.org/abstracts/search?q=F.%20Belmir"> F. Belmir</a>, <a href="https://publications.waset.org/abstracts/search?q=A.%20El%20Bouari"> A. El Bouari</a>, <a href="https://publications.waset.org/abstracts/search?q=Y.%20Abboud"> Y. Abboud</a> </p> <p class="card-text"><strong>Abstract:</strong></p> This article presents a study of the thermal performance of a new solar mobile refrigeration prototype for the preservation of perishable foods. The simulation of the refrigeration cycle and the calculation of the thermal balances made it possible to estimate its consumption and to evaluate the capacity of each photovoltaic component necessary for the production of energy. The study provides a description of the refrigerator construction and operation, including an energy balance analysis of the refrigerator performance under typical loads. The photovoltaic system requirements are also detailed. <p class="card-text"><strong>Keywords:</strong> <a href="https://publications.waset.org/abstracts/search?q=composite" title="composite">composite</a>, <a href="https://publications.waset.org/abstracts/search?q=material" title=" material"> material</a>, <a href="https://publications.waset.org/abstracts/search?q=photovoltaic" title=" photovoltaic"> photovoltaic</a>, <a href="https://publications.waset.org/abstracts/search?q=refrigeration" title=" refrigeration"> refrigeration</a>, <a href="https://publications.waset.org/abstracts/search?q=thermal" title=" thermal"> thermal</a> </p> <a href="https://publications.waset.org/abstracts/138620/sustainable-refrigerated-transport-engineering" class="btn btn-primary btn-sm">Procedia</a> <a href="https://publications.waset.org/abstracts/138620.pdf" target="_blank" class="btn btn-primary btn-sm">PDF</a> <span class="bg-info text-light px-1 py-1 float-right rounded"> Downloads <span class="badge badge-light">246</span> </span> </div> </div> <div class="card paper-listing mb-3 mt-3"> <h5 class="card-header" style="font-size:.9rem"><span class="badge badge-info">9187</span> Enhancing the Performance of Vapor Compression Refrigeration Systems Using HFC134a by Nanoparticles Suspensions</h5> <div class="card-body"> <p class="card-text"><strong>Authors:</strong> <a href="https://publications.waset.org/abstracts/search?q=Hafsi%20Khebab">Hafsi Khebab</a>, <a href="https://publications.waset.org/abstracts/search?q=Zirari%20Mounir"> Zirari Mounir</a>, <a href="https://publications.waset.org/abstracts/search?q=Mohamed%20Nadjib%20Bouaziz"> Mohamed Nadjib Bouaziz</a> </p> <p class="card-text"><strong>Abstract:</strong></p> High Global Warming Potential refrigerants (HydroFluroCarbons) are one of the worst greenhouse gases used in a wide variety of applications, including refrigeration and air-conditioning. Nanotechnology is a promising field in sustainable energy to reduce energy and ecological resource consumption for HVACR (heat, ventilation, air conditioning, and refrigeration) systems. Most researchers reported an improvement in heat transfer coefficient, Coefficient of performance. In this report, a brief summary has been done on the performance enhancement of the Vapor Compression Refrigeration system using HFC134a with nano refrigerants. <p class="card-text"><strong>Keywords:</strong> <a href="https://publications.waset.org/abstracts/search?q=nanorefrigerant" title="nanorefrigerant">nanorefrigerant</a>, <a href="https://publications.waset.org/abstracts/search?q=HFCs" title=" HFCs"> HFCs</a>, <a href="https://publications.waset.org/abstracts/search?q=greenhouse%20gases" title=" greenhouse gases"> greenhouse gases</a>, <a href="https://publications.waset.org/abstracts/search?q=GWP" title=" GWP"> GWP</a>, <a href="https://publications.waset.org/abstracts/search?q=HVACR%20systems" title=" HVACR systems"> HVACR systems</a>, <a href="https://publications.waset.org/abstracts/search?q=energy%20saving" title=" energy saving"> energy saving</a> </p> <a href="https://publications.waset.org/abstracts/159665/enhancing-the-performance-of-vapor-compression-refrigeration-systems-using-hfc134a-by-nanoparticles-suspensions" class="btn btn-primary btn-sm">Procedia</a> <a href="https://publications.waset.org/abstracts/159665.pdf" target="_blank" class="btn btn-primary btn-sm">PDF</a> <span class="bg-info text-light px-1 py-1 float-right rounded"> Downloads <span class="badge badge-light">82</span> </span> </div> </div> <div class="card paper-listing mb-3 mt-3"> <h5 class="card-header" style="font-size:.9rem"><span class="badge badge-info">9186</span> Stabilizing of Lithium-Solid-Electrolyte Interfaces by Atomic Layer Deposition Prepared Nano-Interlayers for a Model All-Solid-State Battery</h5> <div class="card-body"> <p class="card-text"><strong>Authors:</strong> <a href="https://publications.waset.org/abstracts/search?q=Rainer%20Goetz">Rainer Goetz</a>, <a href="https://publications.waset.org/abstracts/search?q=Zahra%20Ahaliabadeh"> Zahra Ahaliabadeh</a>, <a href="https://publications.waset.org/abstracts/search?q=Princess%20S.%20Llanos"> Princess S. Llanos</a>, <a href="https://publications.waset.org/abstracts/search?q=Aliaksandr%20S.%20Bandarenka"> Aliaksandr S. Bandarenka</a>, <a href="https://publications.waset.org/abstracts/search?q=Tanja%20Kallio"> Tanja Kallio</a> </p> <p class="card-text"><strong>Abstract:</strong></p> In order to understand the electrochemistry of all-solid-state batteries (ASSBs), the use of electrochemical equivalent circuits with a physical meaning is essential. A model battery is needed whose characterization is independent of the influence of the complex battery assembly. Lithium-Ion Conducting Glass-Ceramic (LICGC), a model solid electrolyte, is chosen for its stability in the air, but on the other hand, it is also well-known for its instability against metallic lithium upon direct contact. Hence, as a first step towards a model ASSB, the interface between lithium and the solid electrolyte (SE) is stabilized with thin (5 nm and 10 nm) coatings of titanium oxide (TO) and lithium titanium oxide (LTO). Impedance data shows that both materials are able to protect the SE surface from rapid degradation due to reducing lithium and, therefore, can serve as a protective interlayer on the anode side of a model ASSB. <p class="card-text"><strong>Keywords:</strong> <a href="https://publications.waset.org/abstracts/search?q=all-solid-state%20battery" title="all-solid-state battery">all-solid-state battery</a>, <a href="https://publications.waset.org/abstracts/search?q=lithium%20anode" title=" lithium anode"> lithium anode</a>, <a href="https://publications.waset.org/abstracts/search?q=solid%20electrolytes" title=" solid electrolytes"> solid electrolytes</a>, <a href="https://publications.waset.org/abstracts/search?q=interlayers" title=" interlayers"> interlayers</a> </p> <a href="https://publications.waset.org/abstracts/163463/stabilizing-of-lithium-solid-electrolyte-interfaces-by-atomic-layer-deposition-prepared-nano-interlayers-for-a-model-all-solid-state-battery" class="btn btn-primary btn-sm">Procedia</a> <a href="https://publications.waset.org/abstracts/163463.pdf" target="_blank" class="btn btn-primary btn-sm">PDF</a> <span class="bg-info text-light px-1 py-1 float-right rounded"> Downloads <span class="badge badge-light">115</span> </span> </div> </div> <div class="card paper-listing mb-3 mt-3"> <h5 class="card-header" style="font-size:.9rem"><span class="badge badge-info">9185</span> Evaluation of Advanced Architectures for Commercial Refrigeration Systems Using Low Global Warming Potential Refrigerants</h5> <div class="card-body"> <p class="card-text"><strong>Authors:</strong> <a href="https://publications.waset.org/abstracts/search?q=Fabrizio%20Codella">Fabrizio Codella</a>, <a href="https://publications.waset.org/abstracts/search?q=Chris%20Parker"> Chris Parker</a>, <a href="https://publications.waset.org/abstracts/search?q=Samer%20Saab"> Samer Saab</a> </p> <p class="card-text"><strong>Abstract:</strong></p> The Kigali Amendment is driving the adoption of low Global Warming Potential refrigerants in commercial refrigeration systems in over a hundred countries. Several refrigeration systems for the small and large retail stores at mild and hot ambient temperature climates have been compared for hydrofluorocarbons (HFC), hydrofluoroolefins (HFO), transcritical CO₂ and propane, in typical and advanced system architectures. The results of system performance, emissions and lifetime cost have been compared. The greatest benefits were found to be obtained by low global warming potential HFO advanced systems. <p class="card-text"><strong>Keywords:</strong> <a href="https://publications.waset.org/abstracts/search?q=commercial%20refrigeration" title="commercial refrigeration">commercial refrigeration</a>, <a href="https://publications.waset.org/abstracts/search?q=CO%E2%82%82" title=" CO₂"> CO₂</a>, <a href="https://publications.waset.org/abstracts/search?q=emissions" title=" emissions"> emissions</a>, <a href="https://publications.waset.org/abstracts/search?q=HFO" title=" HFO"> HFO</a>, <a href="https://publications.waset.org/abstracts/search?q=lifetime%20cost" title=" lifetime cost"> lifetime cost</a>, <a href="https://publications.waset.org/abstracts/search?q=performance" title=" performance"> performance</a> </p> <a href="https://publications.waset.org/abstracts/148303/evaluation-of-advanced-architectures-for-commercial-refrigeration-systems-using-low-global-warming-potential-refrigerants" class="btn btn-primary btn-sm">Procedia</a> <a href="https://publications.waset.org/abstracts/148303.pdf" target="_blank" class="btn btn-primary btn-sm">PDF</a> <span class="bg-info text-light px-1 py-1 float-right rounded"> Downloads <span class="badge badge-light">153</span> </span> </div> </div> <div class="card paper-listing mb-3 mt-3"> <h5 class="card-header" style="font-size:.9rem"><span class="badge badge-info">9184</span> Applying Different Working Fluids in a Combined Power and Ejector Refrigeration Cycle with Low Temperature Heat Sources </h5> <div class="card-body"> <p class="card-text"><strong>Authors:</strong> <a href="https://publications.waset.org/abstracts/search?q=Samad%20Jafarmadar">Samad Jafarmadar</a>, <a href="https://publications.waset.org/abstracts/search?q=Amin%20Habibzadeh"> Amin Habibzadeh</a> </p> <p class="card-text"><strong>Abstract:</strong></p> A power and cooling cycle, which combines the organic Rankine cycle and the ejector refrigeration cycle supplied by waste heat energy sources, is discussed in this paper. 13 working fluids including wet, dry, and isentropic fluids are studied in order to find their performances on the combined cycle. Various operating conditions’ effects on the proposed cycle are examined by fixing power/refrigeration ratio. According to the results, dry and isentropic fluids have better performance compared with wet fluids. <p class="card-text"><strong>Keywords:</strong> <a href="https://publications.waset.org/abstracts/search?q=combined%20power%20and%20refrigeration%20cycle" title="combined power and refrigeration cycle">combined power and refrigeration cycle</a>, <a href="https://publications.waset.org/abstracts/search?q=low%20temperature%20heat%20sources" title=" low temperature heat sources"> low temperature heat sources</a>, <a href="https://publications.waset.org/abstracts/search?q=organic%20rankine%20cycle" title=" organic rankine cycle"> organic rankine cycle</a>, <a href="https://publications.waset.org/abstracts/search?q=working%20fluids" title=" working fluids"> working fluids</a> </p> <a href="https://publications.waset.org/abstracts/74101/applying-different-working-fluids-in-a-combined-power-and-ejector-refrigeration-cycle-with-low-temperature-heat-sources" class="btn btn-primary btn-sm">Procedia</a> <a href="https://publications.waset.org/abstracts/74101.pdf" target="_blank" class="btn btn-primary btn-sm">PDF</a> <span class="bg-info text-light px-1 py-1 float-right rounded"> Downloads <span class="badge badge-light">270</span> </span> </div> </div> <div class="card paper-listing mb-3 mt-3"> <h5 class="card-header" style="font-size:.9rem"><span class="badge badge-info">9183</span> Design of Membership Ranges for Fuzzy Logic Control of Refrigeration Cycle Driven by a Variable Speed Compressor</h5> <div class="card-body"> <p class="card-text"><strong>Authors:</strong> <a href="https://publications.waset.org/abstracts/search?q=Changho%20Han">Changho Han</a>, <a href="https://publications.waset.org/abstracts/search?q=Jaemin%20Lee"> Jaemin Lee</a>, <a href="https://publications.waset.org/abstracts/search?q=Li%20Hua"> Li Hua</a>, <a href="https://publications.waset.org/abstracts/search?q=Seokkwon%20Jeong"> Seokkwon Jeong</a> </p> <p class="card-text"><strong>Abstract:</strong></p> Design of membership function ranges in fuzzy logic control (FLC) is presented for robust control of a variable speed refrigeration system (VSRS). The criterion values of the membership function ranges can be carried out from the static experimental data, and two different values are offered to compare control performance. Some simulations and real experiments for the VSRS were conducted to verify the validity of the designed membership functions. The experimental results showed good agreement with the simulation results, and the error change rate and its sampling time strongly affected the control performance at transient state of the VSRS. <p class="card-text"><strong>Keywords:</strong> <a href="https://publications.waset.org/abstracts/search?q=variable%20speed%20refrigeration%20system" title="variable speed refrigeration system">variable speed refrigeration system</a>, <a href="https://publications.waset.org/abstracts/search?q=fuzzy%20logic%20control" title=" fuzzy logic control"> fuzzy logic control</a>, <a href="https://publications.waset.org/abstracts/search?q=membership%20function%20range" title=" membership function range"> membership function range</a>, <a href="https://publications.waset.org/abstracts/search?q=control%20performance" title=" control performance"> control performance</a> </p> <a href="https://publications.waset.org/abstracts/90707/design-of-membership-ranges-for-fuzzy-logic-control-of-refrigeration-cycle-driven-by-a-variable-speed-compressor" class="btn btn-primary btn-sm">Procedia</a> <a href="https://publications.waset.org/abstracts/90707.pdf" target="_blank" class="btn btn-primary btn-sm">PDF</a> <span class="bg-info text-light px-1 py-1 float-right rounded"> Downloads <span class="badge badge-light">265</span> </span> </div> </div> <div class="card paper-listing mb-3 mt-3"> <h5 class="card-header" style="font-size:.9rem"><span class="badge badge-info">9182</span> Replacing an Old PFN System with a Solid State Modulator without Changing the Klystron Transformer</h5> <div class="card-body"> <p class="card-text"><strong>Authors:</strong> <a href="https://publications.waset.org/abstracts/search?q=Klas%20Elmquist">Klas Elmquist</a>, <a href="https://publications.waset.org/abstracts/search?q=Anders%20Larsson"> Anders Larsson</a> </p> <p class="card-text"><strong>Abstract:</strong></p> Until the year 2000, almost all short pulse modulators in the accelerator world were made with the pulse forming network (PFN) technique. The pulse forming network systems have since then been replaced with solid state modulators that have better efficiency, better stability, and lower cost of ownership, and they are much smaller. In this paper, it is shown that it is possible to replace a pulse forming network system with a solid-state system without changing the klystron tank and the klystron transformer. The solid-state modulator uses semiconductors switching at 1 kV level. A first pulse transformer transforms the voltage up to 10 kV. The 10 kV pulse is finally fed into the original transformer that is placed under the klystron. A flatness of 0.8 percent and stability of 100 PPM is achieved. The test is done with a CPI 8262 type of klystron. It is also shown that it is possible to run such a system with long cables between the transformers. When using this technique, it will be possible to keep original sub-systems like filament systems, vacuum systems, focusing solenoid systems, and cooling systems for the klystron. This will substantially reduce the cost of an upgrade and prolong the life of the klystron system. <p class="card-text"><strong>Keywords:</strong> <a href="https://publications.waset.org/abstracts/search?q=modulator" title="modulator">modulator</a>, <a href="https://publications.waset.org/abstracts/search?q=solid-state" title=" solid-state"> solid-state</a>, <a href="https://publications.waset.org/abstracts/search?q=PFN-system" title=" PFN-system"> PFN-system</a>, <a href="https://publications.waset.org/abstracts/search?q=thyratron" title=" thyratron"> thyratron</a> </p> <a href="https://publications.waset.org/abstracts/158666/replacing-an-old-pfn-system-with-a-solid-state-modulator-without-changing-the-klystron-transformer" class="btn btn-primary btn-sm">Procedia</a> <a href="https://publications.waset.org/abstracts/158666.pdf" target="_blank" class="btn btn-primary btn-sm">PDF</a> <span class="bg-info text-light px-1 py-1 float-right rounded"> Downloads <span class="badge badge-light">134</span> </span> </div> </div> <div class="card paper-listing mb-3 mt-3"> <h5 class="card-header" style="font-size:.9rem"><span class="badge badge-info">9181</span> Fast High Voltage Solid State Switch Using Insulated Gate Bipolar Transistor for Discharge-Pumped Lasers</h5> <div class="card-body"> <p class="card-text"><strong>Authors:</strong> <a href="https://publications.waset.org/abstracts/search?q=Nur%20Syarafina%20Binti%20Othman">Nur Syarafina Binti Othman</a>, <a href="https://publications.waset.org/abstracts/search?q=Tsubasa%20Jindo"> Tsubasa Jindo</a>, <a href="https://publications.waset.org/abstracts/search?q=Makato%20Yamada"> Makato Yamada</a>, <a href="https://publications.waset.org/abstracts/search?q=Miho%20Tsuyama"> Miho Tsuyama</a>, <a href="https://publications.waset.org/abstracts/search?q=Hitoshi%20Nakano"> Hitoshi Nakano</a> </p> <p class="card-text"><strong>Abstract:</strong></p> A novel method to produce a fast high voltage solid states switch using Insulated Gate Bipolar Transistors (IGBTs) is presented for discharge-pumped gas lasers. The IGBTs are connected in series to achieve a high voltage rating. An avalanche transistor is used as the gate driver. The fast pulse generated by the avalanche transistor quickly charges the large input capacitance of the IGBT, resulting in a switch out of a fast high-voltage pulse. The switching characteristic of fast-high voltage solid state switch has been estimated in the multi-stage series-connected IGBT with the applied voltage of several tens of kV. Electrical circuit diagram and the mythology of fast-high voltage solid state switch as well as experimental results obtained are presented. <p class="card-text"><strong>Keywords:</strong> <a href="https://publications.waset.org/abstracts/search?q=high%20voltage" title="high voltage">high voltage</a>, <a href="https://publications.waset.org/abstracts/search?q=IGBT" title=" IGBT"> IGBT</a>, <a href="https://publications.waset.org/abstracts/search?q=solid%20state%20switch" title=" solid state switch"> solid state switch</a>, <a href="https://publications.waset.org/abstracts/search?q=bipolar%20transistor" title=" bipolar transistor"> bipolar transistor</a> </p> <a href="https://publications.waset.org/abstracts/13067/fast-high-voltage-solid-state-switch-using-insulated-gate-bipolar-transistor-for-discharge-pumped-lasers" class="btn btn-primary btn-sm">Procedia</a> <a href="https://publications.waset.org/abstracts/13067.pdf" target="_blank" class="btn btn-primary btn-sm">PDF</a> <span class="bg-info text-light px-1 py-1 float-right rounded"> Downloads <span class="badge badge-light">552</span> </span> </div> </div> <div class="card paper-listing mb-3 mt-3"> <h5 class="card-header" style="font-size:.9rem"><span class="badge badge-info">9180</span> Magnetic, Magnetocaloric, and Electrical Properties of Pr0.7Ca0.3Mn0.9M0.1O3</h5> <div class="card-body"> <p class="card-text"><strong>Authors:</strong> <a href="https://publications.waset.org/abstracts/search?q=A.%20Selmi">A. Selmi</a>, <a href="https://publications.waset.org/abstracts/search?q=A.%20Bettaibi"> A. Bettaibi</a>, <a href="https://publications.waset.org/abstracts/search?q=H.%20Rahmouni"> H. Rahmouni</a>, <a href="https://publications.waset.org/abstracts/search?q=R.%20M%E2%80%99nassri"> R. M’nassri</a>, <a href="https://publications.waset.org/abstracts/search?q=N.%20Chniba%20Boudjada"> N. Chniba Boudjada</a>, <a href="https://publications.waset.org/abstracts/search?q=A.%20Chiekhrouhou"> A. Chiekhrouhou</a>, <a href="https://publications.waset.org/abstracts/search?q=K.%20Khirouni"> K. Khirouni</a> </p> <p class="card-text"><strong>Abstract:</strong></p> Investigation of magnetic and magnetocaloric properties of Pr₀.₇Ca₀.₃Mn₀.₉M₀.₁O₃ perovskite manganites (M=Cr and Ni) has been carried out. Our compounds were prepared by the conventional solid-state reaction method at high temperatures. Rietveld refinement of X-ray diffraction pattern using FULLPROF method shows that all compounds adopt the orthorhombic structure with Pnma space group. The partial substitution of Mn-site drives the system from charge order state to ferromagnetic one with a Curie temperature T𝒸=150K, 118k and 116K for M=Cr and Ni, respectively. Magnetization measurements versus temperature in a magnetic applied field of 0.05T show that all our samples exhibit a paramagnetic–ferromagnetic transition with decreasing temperature. From M(H) isotherms, we have deduced the magnetic entropy change, which present maximum values of 2.37 J/kg.K and 2.94 J/kg.K, in a magnetic field change of 5T for M=Cr and Ni, respectively. <p class="card-text"><strong>Keywords:</strong> <a href="https://publications.waset.org/abstracts/search?q=manganites" title="manganites">manganites</a>, <a href="https://publications.waset.org/abstracts/search?q=magnetocaloric" title=" magnetocaloric"> magnetocaloric</a>, <a href="https://publications.waset.org/abstracts/search?q=magnetic" title=" magnetic"> magnetic</a>, <a href="https://publications.waset.org/abstracts/search?q=refrigeration" title=" refrigeration"> refrigeration</a> </p> <a href="https://publications.waset.org/abstracts/165914/magnetic-magnetocaloric-and-electrical-properties-of-pr07ca03mn09m01o3" class="btn btn-primary btn-sm">Procedia</a> <a href="https://publications.waset.org/abstracts/165914.pdf" target="_blank" class="btn btn-primary btn-sm">PDF</a> <span class="bg-info text-light px-1 py-1 float-right rounded"> Downloads <span class="badge badge-light">79</span> </span> </div> </div> <div class="card paper-listing mb-3 mt-3"> <h5 class="card-header" style="font-size:.9rem"><span class="badge badge-info">9179</span> Optimization of a Combined Ejector-Vapor Compression Refrigeration Systems with R134a</h5> <div class="card-body"> <p class="card-text"><strong>Authors:</strong> <a href="https://publications.waset.org/abstracts/search?q=Ilhem%20Ouelhazi">Ilhem Ouelhazi</a>, <a href="https://publications.waset.org/abstracts/search?q=Mouna%20Elakhdar"> Mouna Elakhdar</a>, <a href="https://publications.waset.org/abstracts/search?q=Lakdar%20Kairouani"> Lakdar Kairouani</a> </p> <p class="card-text"><strong>Abstract:</strong></p> A computer simulation model for a combined ejector-vapor compression cycle that uses working fluid R134a. A refrigeration system was developed which combines a basic vapor compression refrigeration cycle with an ejector cooling cycle. A one-dimensional mathematical model was developed using the equations governing the flow and thermodynamics based on the constant area ejector flow model. The effects of the operating parameters on the cooling capacity, the performance coefficient, and the entrainment ratio are studied. The current model is based on the NIST-REFPROP database for refrigerants properties calculations. The simulated performance is compared with the available experimental data from the literature for validation. <p class="card-text"><strong>Keywords:</strong> <a href="https://publications.waset.org/abstracts/search?q=combined%20refrigeration%20cycle" title="combined refrigeration cycle">combined refrigeration cycle</a>, <a href="https://publications.waset.org/abstracts/search?q=constant%20area%20ejector" title=" constant area ejector"> constant area ejector</a>, <a href="https://publications.waset.org/abstracts/search?q=R134a" title=" R134a"> R134a</a>, <a href="https://publications.waset.org/abstracts/search?q=ejector-cooling%20cycle" title=" ejector-cooling cycle"> ejector-cooling cycle</a>, <a href="https://publications.waset.org/abstracts/search?q=performance" title=" performance"> performance</a>, <a href="https://publications.waset.org/abstracts/search?q=mathematical%20simulation" title=" mathematical simulation"> mathematical simulation</a>, <a href="https://publications.waset.org/abstracts/search?q=vapor%20compression%20cycle" title=" vapor compression cycle"> vapor compression cycle</a> </p> <a href="https://publications.waset.org/abstracts/87803/optimization-of-a-combined-ejector-vapor-compression-refrigeration-systems-with-r134a" class="btn btn-primary btn-sm">Procedia</a> <a href="https://publications.waset.org/abstracts/87803.pdf" target="_blank" class="btn btn-primary btn-sm">PDF</a> <span class="bg-info text-light px-1 py-1 float-right rounded"> Downloads <span class="badge badge-light">226</span> </span> </div> </div> <div class="card paper-listing mb-3 mt-3"> <h5 class="card-header" style="font-size:.9rem"><span class="badge badge-info">9178</span> Energy Efficient Refrigerator</h5> <div class="card-body"> <p class="card-text"><strong>Authors:</strong> <a href="https://publications.waset.org/abstracts/search?q=Jagannath%20Koravadi">Jagannath Koravadi</a>, <a href="https://publications.waset.org/abstracts/search?q=Archith%20Gupta"> Archith Gupta</a> </p> <p class="card-text"><strong>Abstract:</strong></p> In a world with constantly growing energy prices, and growing concerns about the global climate changes caused by increased energy consumption, it is becoming more and more essential to save energy wherever possible. Refrigeration systems are one of the major and bulk energy consuming systems now-a-days in industrial sectors, residential sectors and household environment. Refrigeration systems with considerable cooling requirements consume a large amount of electricity and thereby contribute greatly to the running costs. Therefore, a great deal of attention is being paid towards improvement of the performance of the refrigeration systems in this regard throughout the world. The Coefficient of Performance (COP) of a refrigeration system is used for determining the system's overall efficiency. The operating cost to the consumer and the overall environmental impact of a refrigeration system in turn depends on the COP or efficiency of the system. The COP of a refrigeration system should therefore be as high as possible. Slight modifications in the technical elements of the modern refrigeration systems have the potential to reduce the energy consumption, and improvements in simple operational practices with minimal expenses can have beneficial impact on COP of the system. Thus, the challenge is to determine the changes that can be made in a refrigeration system in order to improve its performance, reduce operating costs and power requirement, improve environmental outcomes, and achieve a higher COP. The opportunity here, and a better solution to this challenge, will be to incorporate modifications in conventional refrigeration systems for saving energy. Energy efficiency, in addition to improvement of COP, can deliver a range of savings such as reduced operation and maintenance costs, improved system reliability, improved safety, increased productivity, better matching of refrigeration load and equipment capacity, reduced resource consumption and greenhouse gas emissions, better working environment, and reduced energy costs. The present work aims at fabricating a working model of a refrigerator that will provide for effective heat recovery from superheated refrigerant with the help of an efficient de-superheater. The temperature of the refrigerant and water in the de-super heater at different intervals of time are measured to determine the quantity of waste heat recovered. It is found that the COP of the system improves by about 6% with the de-superheater and the power input to the compressor decreases by 4 % and also the refrigeration capacity increases by 4%. <p class="card-text"><strong>Keywords:</strong> <a href="https://publications.waset.org/abstracts/search?q=coefficiency%20of%20performance" title="coefficiency of performance">coefficiency of performance</a>, <a href="https://publications.waset.org/abstracts/search?q=de-superheater" title=" de-superheater"> de-superheater</a>, <a href="https://publications.waset.org/abstracts/search?q=refrigerant" title=" refrigerant"> refrigerant</a>, <a href="https://publications.waset.org/abstracts/search?q=refrigeration%20capacity" title=" refrigeration capacity"> refrigeration capacity</a>, <a href="https://publications.waset.org/abstracts/search?q=heat%20recovery" title=" heat recovery"> heat recovery</a> </p> <a href="https://publications.waset.org/abstracts/35699/energy-efficient-refrigerator" class="btn btn-primary btn-sm">Procedia</a> <a href="https://publications.waset.org/abstracts/35699.pdf" target="_blank" class="btn btn-primary btn-sm">PDF</a> <span class="bg-info text-light px-1 py-1 float-right rounded"> Downloads <span class="badge badge-light">320</span> </span> </div> </div> <div class="card paper-listing mb-3 mt-3"> <h5 class="card-header" style="font-size:.9rem"><span class="badge badge-info">9177</span> Performance Study of Cascade Refrigeration System Using Alternative Refrigerants</h5> <div class="card-body"> <p class="card-text"><strong>Authors:</strong> <a href="https://publications.waset.org/abstracts/search?q=Gulshan%20Sachdeva">Gulshan Sachdeva</a>, <a href="https://publications.waset.org/abstracts/search?q=Vaibhav%20Jain"> Vaibhav Jain</a>, <a href="https://publications.waset.org/abstracts/search?q=S.%20S.%20Kachhwaha"> S. S. Kachhwaha</a> </p> <p class="card-text"><strong>Abstract:</strong></p> Cascade refrigeration systems employ series of single stage vapor compression units which are thermally coupled with evaporator/condenser cascades. Different refrigerants are used in each of the circuit depending on the optimum characteristics shown by the refrigerant for a particular application. In the present research study, a steady state thermodynamic model is developed which simulates the working of an actual cascade system. The model provides COP and all other system parameters like total compressor work, temperature, pressure, enthalpy and entropy at different state points. The working fluid in Low Temperature Circuit (LTC) is CO2 (R744) while ammonia (R717), propane (R290), propylene (R1270), R404A and R12 are the refrigerants in High Temperature Circuit (HTC). The performance curves of ammonia, propane, propylene, and R404A are compared with R12 to find its nearest substitute. Results show that ammonia is the best substitute of R12. <p class="card-text"><strong>Keywords:</strong> <a href="https://publications.waset.org/abstracts/search?q=cascade%20system" title="cascade system">cascade system</a>, <a href="https://publications.waset.org/abstracts/search?q=refrigerants" title=" refrigerants"> refrigerants</a>, <a href="https://publications.waset.org/abstracts/search?q=thermodynamic%20model" title=" thermodynamic model"> thermodynamic model</a>, <a href="https://publications.waset.org/abstracts/search?q=production%20engineering" title=" production engineering"> production engineering</a> </p> <a href="https://publications.waset.org/abstracts/4923/performance-study-of-cascade-refrigeration-system-using-alternative-refrigerants" class="btn btn-primary btn-sm">Procedia</a> <a href="https://publications.waset.org/abstracts/4923.pdf" target="_blank" class="btn btn-primary btn-sm">PDF</a> <span class="bg-info text-light px-1 py-1 float-right rounded"> Downloads <span class="badge badge-light">361</span> </span> </div> </div> <div class="card paper-listing mb-3 mt-3"> <h5 class="card-header" style="font-size:.9rem"><span class="badge badge-info">9176</span> A Conceptual Design of Freeze Desalination Using Low Cost Refrigeration</h5> <div class="card-body"> <p class="card-text"><strong>Authors:</strong> <a href="https://publications.waset.org/abstracts/search?q=Parul%20Sahu">Parul Sahu</a> </p> <p class="card-text"><strong>Abstract:</strong></p> In recent years, seawater desalination has been emerged as a potential resource to circumvent water scarcity, especially in coastal regions. Among the various methods, thermal evaporation or distillation and membrane operations like Reverse Osmosis (RO) has been exploited at commercial scale. However, the energy cost and maintenance expenses associated with these processes remain high. In this context Freeze Desalination (FD), subjected to the availability of low cost refrigeration, offers an exciting alternative. Liquefied Natural Gas (LNG) regasification terminals provide an opportunity to utilize the refrigeration available with regasification of LNG. This work presents the conceptualization and development of a process scheme integrating the ice and hydrate based FD to the LNG regasification process. This integration overcomes the high energy demand associated with FD processes by utilizing the refrigeration associated with LNG regasification. An optimal process scheme was obtained by performing process simulation using ASPEN PLUS simulator. The results indicated the new proposed process requires only 1 kWh/m³ of energy with the utilization of maximum refrigeration. In addition, a sensitivity analysis was also performed to study the effect of various process parameters on water recovery and energy consumption for the proposed process. The results show that the energy consumption decreases by 30% with an increase in water recovery from 30% to 60%. However, due to operational limitations associated with ice and hydrate handling in seawater, the water recovery cannot be maximized but optimized. The proposed process can be potentially used to desalinate seawater in integration with LNG regasification terminal. <p class="card-text"><strong>Keywords:</strong> <a href="https://publications.waset.org/abstracts/search?q=freeze%20desalination" title="freeze desalination">freeze desalination</a>, <a href="https://publications.waset.org/abstracts/search?q=liquefied%20natural%20gas%20regasification" title=" liquefied natural gas regasification"> liquefied natural gas regasification</a>, <a href="https://publications.waset.org/abstracts/search?q=process%20simulation" title=" process simulation"> process simulation</a>, <a href="https://publications.waset.org/abstracts/search?q=refrigeration" title=" refrigeration"> refrigeration</a> </p> <a href="https://publications.waset.org/abstracts/97577/a-conceptual-design-of-freeze-desalination-using-low-cost-refrigeration" class="btn btn-primary btn-sm">Procedia</a> <a href="https://publications.waset.org/abstracts/97577.pdf" target="_blank" class="btn btn-primary btn-sm">PDF</a> <span class="bg-info text-light px-1 py-1 float-right rounded"> Downloads <span class="badge badge-light">131</span> </span> </div> </div> <div class="card paper-listing mb-3 mt-3"> <h5 class="card-header" style="font-size:.9rem"><span class="badge badge-info">9175</span> Exergy Analysis of a Vapor Absorption Refrigeration System Using Carbon Dioxide as Refrigerant</h5> <div class="card-body"> <p class="card-text"><strong>Authors:</strong> <a href="https://publications.waset.org/abstracts/search?q=Samsher%20Gautam">Samsher Gautam</a>, <a href="https://publications.waset.org/abstracts/search?q=Apoorva%20Roy"> Apoorva Roy</a>, <a href="https://publications.waset.org/abstracts/search?q=Bhuvan%20Aggarwal"> Bhuvan Aggarwal</a> </p> <p class="card-text"><strong>Abstract:</strong></p> Vapor absorption refrigeration systems can replace vapor compression systems in many applications as they can operate on a low-grade heat source and are environment-friendly. Widely used refrigerants such as CFCs and HFCs cause significant global warming. Natural refrigerants can be an alternative to them, among which carbon dioxide is promising for use in automotive air conditioning systems. Its inherent safety, ability to withstand high pressure and high heat transfer coefficient coupled with easy availability make it a likely choice for refrigerant. Various properties of the ionic liquid [bmim][PF₆], such as non-toxicity, stability over a wide temperature range and ability to dissolve gases like carbon dioxide, make it a suitable absorbent for a vapor absorption refrigeration system. In this paper, an absorption chiller consisting of a generator, condenser, evaporator and absorber was studied at an operating temperature of 70⁰C. A thermodynamic model was set up using the Peng-Robinson equations of state to predict the behavior of the refrigerant and absorbent pair at different points in the system. A MATLAB code was used to obtain the values of enthalpy and entropy at selected points in the system. The exergy destruction in each component and exergetic coefficient of performance (ECOP) of the system were calculated by performing an exergy analysis based on the second law of thermodynamics. Graphs were plotted between varying operating conditions and the ECOP obtained in each case. The effect of every component on the ECOP was examined. The exergetic coefficient of performance was found to be lesser than the coefficient of performance based on the first law of thermodynamics. <p class="card-text"><strong>Keywords:</strong> <a href="https://publications.waset.org/abstracts/search?q=%5Bbmim%5D%5BPF%E2%82%86%5D%20as%20absorbent" title="[bmim][PF₆] as absorbent">[bmim][PF₆] as absorbent</a>, <a href="https://publications.waset.org/abstracts/search?q=carbon%20dioxide%20as%20refrigerant" title=" carbon dioxide as refrigerant"> carbon dioxide as refrigerant</a>, <a href="https://publications.waset.org/abstracts/search?q=exergy%20analysis" title=" exergy analysis"> exergy analysis</a>, <a href="https://publications.waset.org/abstracts/search?q=Peng-Robinson%20equations%20of%20state" title=" Peng-Robinson equations of state"> Peng-Robinson equations of state</a>, <a href="https://publications.waset.org/abstracts/search?q=vapor%20absorption%20refrigeration" title=" vapor absorption refrigeration"> vapor absorption refrigeration</a> </p> <a href="https://publications.waset.org/abstracts/73396/exergy-analysis-of-a-vapor-absorption-refrigeration-system-using-carbon-dioxide-as-refrigerant" class="btn btn-primary btn-sm">Procedia</a> <a href="https://publications.waset.org/abstracts/73396.pdf" target="_blank" class="btn btn-primary btn-sm">PDF</a> <span class="bg-info text-light px-1 py-1 float-right rounded"> Downloads <span class="badge badge-light">287</span> </span> </div> </div> <div class="card paper-listing mb-3 mt-3"> <h5 class="card-header" style="font-size:.9rem"><span class="badge badge-info">9174</span> For Single to Multilayer Polyvinylidene Fluoride Based Polymer for Electro-Caloric Cooling</h5> <div class="card-body"> <p class="card-text"><strong>Authors:</strong> <a href="https://publications.waset.org/abstracts/search?q=Nouh%20Zeggai">Nouh Zeggai</a>, <a href="https://publications.waset.org/abstracts/search?q=Lucas%20Debrux"> Lucas Debrux</a>, <a href="https://publications.waset.org/abstracts/search?q=Fabien%20Parrain"> Fabien Parrain</a>, <a href="https://publications.waset.org/abstracts/search?q=Brahim%20Dkhil"> Brahim Dkhil</a>, <a href="https://publications.waset.org/abstracts/search?q=Martino%20Lobue"> Martino Lobue</a>, <a href="https://publications.waset.org/abstracts/search?q=Morgan%20Almanza"> Morgan Almanza</a> </p> <p class="card-text"><strong>Abstract:</strong></p> Refrigeration and air conditioning are some of the most used energies in our daily life, especially vapor compression refrigeration. Electrocaloric material might appears as an alternative towards solid-state cooling. polyvinylidene fluoride (PVDF) based polymer has shown promising adiabatic temperature change (∆T) and entropy change (∆S). There is practically no limit to the electric field that can be applied, except the one that the material can withstand. However, when working with a large surface as required in a device, the chance to have a defect is larger and can drastically reduce the voltage breakdown, thus reducing the electrocaloric properties. In this work, we propose to study how the characteristic of a single film are transposed when going to multilayer. The laminator and the hot press appear as two interesting processes that have been investigating to achieve a multilayer film. The study is mainly focused on the breakdown field and the adiabatic temperature change, but the phase and crystallinity have also been measured. We process one layer-based PVDF and assemble them to obtain a multilayer. Pressing at hot temperature method and lamination were used for the production of the thin films. The multilayer film shows higher breakdown strength, temperature change, and crystallinity (beta phases) using the hot press technique. <p class="card-text"><strong>Keywords:</strong> <a href="https://publications.waset.org/abstracts/search?q=PVDF-TrFE-CFE" title="PVDF-TrFE-CFE">PVDF-TrFE-CFE</a>, <a href="https://publications.waset.org/abstracts/search?q=multilayer" title=" multilayer"> multilayer</a>, <a href="https://publications.waset.org/abstracts/search?q=electrocaloric%20effect" title=" electrocaloric effect"> electrocaloric effect</a>, <a href="https://publications.waset.org/abstracts/search?q=hot%20press" title=" hot press"> hot press</a>, <a href="https://publications.waset.org/abstracts/search?q=cooling%20device" title=" cooling device"> cooling device</a> </p> <a href="https://publications.waset.org/abstracts/141353/for-single-to-multilayer-polyvinylidene-fluoride-based-polymer-for-electro-caloric-cooling" class="btn btn-primary btn-sm">Procedia</a> <a href="https://publications.waset.org/abstracts/141353.pdf" target="_blank" class="btn btn-primary btn-sm">PDF</a> <span class="bg-info text-light px-1 py-1 float-right rounded"> Downloads <span class="badge badge-light">170</span> </span> </div> </div> <div class="card paper-listing mb-3 mt-3"> <h5 class="card-header" style="font-size:.9rem"><span class="badge badge-info">9173</span> Exergy Analysis of Vapour Compression Refrigeration System Using R507A, R134a, R114, R22 and R717</h5> <div class="card-body"> <p class="card-text"><strong>Authors:</strong> <a href="https://publications.waset.org/abstracts/search?q=Ali%20Dinarveis">Ali Dinarveis</a> </p> <p class="card-text"><strong>Abstract:</strong></p> This paper compares the energy and exergy efficiency of a vapour compression refrigeration system using refrigerants of different groups. In this study, five different refrigerants including R507A, R134a, R114, R22 and R717 have been studied. EES Program is used to solve the thermodynamic equations. The results of this analysis are shown graphically. Based on the results, energy and exergy efficiencies for R717 are higher than the other refrigerants. Also, the energy and exergy efficiencies will be decreased with increasing the condensing temperature and decreasing the evaporating temperature. <p class="card-text"><strong>Keywords:</strong> <a href="https://publications.waset.org/abstracts/search?q=Energy" title="Energy">Energy</a>, <a href="https://publications.waset.org/abstracts/search?q=Exergy" title=" Exergy"> Exergy</a>, <a href="https://publications.waset.org/abstracts/search?q=Refrigeration" title=" Refrigeration"> Refrigeration</a>, <a href="https://publications.waset.org/abstracts/search?q=thermodynamic" title=" thermodynamic"> thermodynamic</a>, <a href="https://publications.waset.org/abstracts/search?q=vapour" title=" vapour"> vapour</a> </p> <a href="https://publications.waset.org/abstracts/108782/exergy-analysis-of-vapour-compression-refrigeration-system-using-r507a-r134a-r114-r22-and-r717" class="btn btn-primary btn-sm">Procedia</a> <a href="https://publications.waset.org/abstracts/108782.pdf" target="_blank" class="btn btn-primary btn-sm">PDF</a> <span class="bg-info text-light px-1 py-1 float-right rounded"> Downloads <span class="badge badge-light">148</span> </span> </div> </div> <div class="card paper-listing mb-3 mt-3"> <h5 class="card-header" style="font-size:.9rem"><span class="badge badge-info">9172</span> Study of Skid-Mounted Natural Gas Treatment Process</h5> <div class="card-body"> <p class="card-text"><strong>Authors:</strong> <a href="https://publications.waset.org/abstracts/search?q=Di%20Han">Di Han</a>, <a href="https://publications.waset.org/abstracts/search?q=Lingfeng%20Li"> Lingfeng Li</a> </p> <p class="card-text"><strong>Abstract:</strong></p> Selection of low-temperature separation dehydration and dehydrochlorination process applicable to skid design, using Hysys software to simulate the low-temperature separation dehydration and dehydrochlorination process under different refrigeration modes, focusing on comparing the refrigeration effect of different refrigeration modes, the condensation amount of hydrocarbon liquids and alcoholic wastewater, as well as the adaptability of the process, and determining the low-temperature separation process applicable to the natural gas dehydration and dehydrochlorination skid into the design of skid; and finally, to carry out the CNG recycling process calculations of the processed qualified natural gas and to determine the dehydration scheme and the key parameters of the compression process. <p class="card-text"><strong>Keywords:</strong> <a href="https://publications.waset.org/abstracts/search?q=skidding" title="skidding">skidding</a>, <a href="https://publications.waset.org/abstracts/search?q=dehydration%20and%20dehydrochlorination" title=" dehydration and dehydrochlorination"> dehydration and dehydrochlorination</a>, <a href="https://publications.waset.org/abstracts/search?q=cryogenic%20separation%20process" title=" cryogenic separation process"> cryogenic separation process</a>, <a href="https://publications.waset.org/abstracts/search?q=CNG%20recovery%20process%20calculations" title=" CNG recovery process calculations"> CNG recovery process calculations</a> </p> <a href="https://publications.waset.org/abstracts/176218/study-of-skid-mounted-natural-gas-treatment-process" class="btn btn-primary btn-sm">Procedia</a> <a href="https://publications.waset.org/abstracts/176218.pdf" target="_blank" class="btn btn-primary btn-sm">PDF</a> <span class="bg-info text-light px-1 py-1 float-right rounded"> Downloads <span class="badge badge-light">142</span> </span> </div> </div> <div class="card paper-listing mb-3 mt-3"> <h5 class="card-header" style="font-size:.9rem"><span class="badge badge-info">9171</span> Coefficient of Performance (COP) Optimization of an R134a Cross Vane Expander Compressor Refrigeration System</h5> <div class="card-body"> <p class="card-text"><strong>Authors:</strong> <a href="https://publications.waset.org/abstracts/search?q=Y.%20D.%20Lim">Y. D. Lim</a>, <a href="https://publications.waset.org/abstracts/search?q=K.%20S.%20Yap"> K. S. Yap</a>, <a href="https://publications.waset.org/abstracts/search?q=K.%20T.%20Ooi"> K. T. Ooi</a> </p> <p class="card-text"><strong>Abstract:</strong></p> Cross Vane Expander Compressor (CVEC) is a newly invented expander-compressor combined unit, where it is introduced to replace the compressor and the expansion valve in traditional refrigeration system. The mathematical model of CVEC has been developed to examine its performance, and it was found that the energy consumption of a conventional refrigeration system was reduced by as much as 18%. It is believed that energy consumption can be further reduced by optimizing the device. In this study, the coefficient of performance (COP) of CVEC has been optimized under predetermined operational parameters and constrained main design parameters. Several main design parameters of CVEC were selected to be the variables, and the optimization was done with theoretical model in a simulation program. The theoretical model consists of geometrical model, dynamic model, heat transfer model and valve dynamics model. Complex optimization method, which is a constrained, direct search and multi-variables method was used in the study. As a result, the optimization study suggested that with an appropriate combination of design parameters, a 58% COP improvement in CVEC R134a refrigeration system is possible. <p class="card-text"><strong>Keywords:</strong> <a href="https://publications.waset.org/abstracts/search?q=COP" title="COP">COP</a>, <a href="https://publications.waset.org/abstracts/search?q=cross%20vane%20expander-compressor" title=" cross vane expander-compressor"> cross vane expander-compressor</a>, <a href="https://publications.waset.org/abstracts/search?q=CVEC" title=" CVEC"> CVEC</a>, <a href="https://publications.waset.org/abstracts/search?q=design" title=" design"> design</a>, <a href="https://publications.waset.org/abstracts/search?q=simulation" title=" simulation"> simulation</a>, <a href="https://publications.waset.org/abstracts/search?q=refrigeration%20system" title=" refrigeration system"> refrigeration system</a>, <a href="https://publications.waset.org/abstracts/search?q=air-conditioning" title=" air-conditioning"> air-conditioning</a>, <a href="https://publications.waset.org/abstracts/search?q=R134a" title=" R134a"> R134a</a>, <a href="https://publications.waset.org/abstracts/search?q=multi%20variables" title=" multi variables"> multi variables</a> </p> <a href="https://publications.waset.org/abstracts/50785/coefficient-of-performance-cop-optimization-of-an-r134a-cross-vane-expander-compressor-refrigeration-system" class="btn btn-primary btn-sm">Procedia</a> <a href="https://publications.waset.org/abstracts/50785.pdf" target="_blank" class="btn btn-primary btn-sm">PDF</a> <span class="bg-info text-light px-1 py-1 float-right rounded"> Downloads <span class="badge badge-light">334</span> </span> </div> </div> <div class="card paper-listing mb-3 mt-3"> <h5 class="card-header" style="font-size:.9rem"><span class="badge badge-info">9170</span> Comparative Exergy Analysis of Vapor Compression Refrigeration System Using Alternative Refrigerants</h5> <div class="card-body"> <p class="card-text"><strong>Authors:</strong> <a href="https://publications.waset.org/abstracts/search?q=Gulshan%20Sachdeva">Gulshan Sachdeva</a>, <a href="https://publications.waset.org/abstracts/search?q=Vaibhav%20Jain"> Vaibhav Jain</a> </p> <p class="card-text"><strong>Abstract:</strong></p> In present paper, the performance of various alternative refrigerants is compared to find the substitute of R22, the widely used hydrochlorofluorocarbon refrigerant in developing countries. These include the environmentally friendly hydrofluorocarbon (HFC) refrigerants such as R134A, R410A, R407C and M20. In the present study, a steady state thermodynamic model (includes both first and second law analysis) which simulates the working of an actual vapor-compression system is developed. The model predicts the performance of system with alternative refrigerants. Considering the recent trends of replacement of ozone depleting refrigerants and improvement in system efficiency, R407C is found to be potential candidate to replace R22 refrigerant in the present study. <p class="card-text"><strong>Keywords:</strong> <a href="https://publications.waset.org/abstracts/search?q=refrigeration" title="refrigeration">refrigeration</a>, <a href="https://publications.waset.org/abstracts/search?q=compression%20system" title=" compression system"> compression system</a>, <a href="https://publications.waset.org/abstracts/search?q=performance%20study" title=" performance study"> performance study</a>, <a href="https://publications.waset.org/abstracts/search?q=modeling" title=" modeling"> modeling</a>, <a href="https://publications.waset.org/abstracts/search?q=R407C" title=" R407C"> R407C</a> </p> <a href="https://publications.waset.org/abstracts/48590/comparative-exergy-analysis-of-vapor-compression-refrigeration-system-using-alternative-refrigerants" class="btn btn-primary btn-sm">Procedia</a> <a href="https://publications.waset.org/abstracts/48590.pdf" target="_blank" class="btn btn-primary btn-sm">PDF</a> <span class="bg-info text-light px-1 py-1 float-right rounded"> Downloads <span class="badge badge-light">315</span> </span> </div> </div> <div class="card paper-listing mb-3 mt-3"> <h5 class="card-header" style="font-size:.9rem"><span class="badge badge-info">9169</span> Internal Power Recovery in Cryogenic Cooling Plants Part I: Expander Development</h5> <div class="card-body"> <p class="card-text"><strong>Authors:</strong> <a href="https://publications.waset.org/abstracts/search?q=Ambra%20Giovannelli">Ambra Giovannelli</a>, <a href="https://publications.waset.org/abstracts/search?q=Erika%20Maria%20Archilei"> Erika Maria Archilei</a> </p> <p class="card-text"><strong>Abstract:</strong></p> The amount of the electrical power required by refrigeration systems is relevant worldwide. It is evaluated in the order of 15% of the total electricity production taking refrigeration and air-conditioning into consideration. For this reason, in the last years several energy saving techniques have been proposed to reduce the power demand of such plants. The paper deals with the development of an innovative internal recovery system for cryogenic cooling plants. Such a system consists in a Compressor-Expander Group (CEG) designed on the basis of the automotive turbocharging technology. In particular, the paper is focused on the design of the expander, the critical component of the CEG system. Due to the low volumetric flow entering the expander and the high expansion ratio, a commercial turbocharger expander wheel was strongly modified. It was equipped with a transonic nozzle, designed to have a radially inflow full admission. To verify the performance of such a machine and suggest improvements, two different set of nozzles have been designed and modelled by means of the commercial Ansys-CFX software. steady-state 3D CFD simulations of the second-generation prototype are presented and compared with the initial ones. <p class="card-text"><strong>Keywords:</strong> <a href="https://publications.waset.org/abstracts/search?q=vapour%20cCompression%20systems" title="vapour cCompression systems">vapour cCompression systems</a>, <a href="https://publications.waset.org/abstracts/search?q=energy%20saving" title=" energy saving"> energy saving</a>, <a href="https://publications.waset.org/abstracts/search?q=refrigeration%20plant" title=" refrigeration plant"> refrigeration plant</a>, <a href="https://publications.waset.org/abstracts/search?q=organic%20fluids" title=" organic fluids"> organic fluids</a>, <a href="https://publications.waset.org/abstracts/search?q=radial%20turbine" title=" radial turbine"> radial turbine</a> </p> <a href="https://publications.waset.org/abstracts/46475/internal-power-recovery-in-cryogenic-cooling-plants-part-i-expander-development" class="btn btn-primary btn-sm">Procedia</a> <a href="https://publications.waset.org/abstracts/46475.pdf" target="_blank" class="btn btn-primary btn-sm">PDF</a> <span class="bg-info text-light px-1 py-1 float-right rounded"> Downloads <span class="badge badge-light">208</span> </span> </div> </div> <div class="card paper-listing mb-3 mt-3"> <h5 class="card-header" style="font-size:.9rem"><span class="badge badge-info">9168</span> Design Optimisation of a Novel Cross Vane Expander-Compressor Unit for Refrigeration System</h5> <div class="card-body"> <p class="card-text"><strong>Authors:</strong> <a href="https://publications.waset.org/abstracts/search?q=Y.%20D.%20Lim">Y. D. Lim</a>, <a href="https://publications.waset.org/abstracts/search?q=K.%20S.%20Yap"> K. S. Yap</a>, <a href="https://publications.waset.org/abstracts/search?q=K.%20T.%20Ooi"> K. T. Ooi</a> </p> <p class="card-text"><strong>Abstract:</strong></p> In recent years, environmental issue has been a hot topic in the world, especially the global warming effect caused by conventional non-environmentally friendly refrigerants has increased. Several studies of a more energy-efficient and environmentally friendly refrigeration system have been conducted in order to tackle the issue. In search of a better refrigeration system, CO2 refrigeration system has been proposed as a better option. However, the high throttling loss involved during the expansion process of the refrigeration cycle leads to a relatively low efficiency and thus the system is impractical. In order to improve the efficiency of the refrigeration system, it is suggested by replacing the conventional expansion valve in the refrigeration system with an expander. Based on this issue, a new type of expander-compressor combined unit, named Cross Vane Expander-Compressor (CVEC) was introduced to replace the compressor and the expansion valve of a conventional refrigeration system. A mathematical model was developed to calculate the performance of CVEC, and it was found that the machine is capable of saving the energy consumption of a refrigeration system by as much as 18%. Apart from energy saving, CVEC is also geometrically simpler and more compact. To further improve its efficiency, optimization study of the device is carried out. In this report, several design parameters of CVEC were chosen to be the variables of optimization study. This optimization study was done in a simulation program by using complex optimization method, which is a direct search, multi-variables and constrained optimization method. It was found that the main design parameters, which was shaft radius was reduced around 8% while the inner cylinder radius was remained unchanged at its lower limit after optimization. Furthermore, the port sizes were increased to their upper limit after optimization. The changes of these design parameters have resulted in reduction of around 12% in the total frictional loss and reduction of 4% in power consumption. Eventually, the optimization study has resulted in an improvement in the mechanical efficiency CVEC by 4% and improvement in COP by 6%. <p class="card-text"><strong>Keywords:</strong> <a href="https://publications.waset.org/abstracts/search?q=complex%20optimization%20method" title="complex optimization method">complex optimization method</a>, <a href="https://publications.waset.org/abstracts/search?q=COP" title=" COP"> COP</a>, <a href="https://publications.waset.org/abstracts/search?q=cross%20vane%20expander-compressor" title=" cross vane expander-compressor"> cross vane expander-compressor</a>, <a href="https://publications.waset.org/abstracts/search?q=CVEC" title=" CVEC"> CVEC</a>, <a href="https://publications.waset.org/abstracts/search?q=design%20optimization" title=" design optimization"> design optimization</a>, <a href="https://publications.waset.org/abstracts/search?q=direct%20search" title=" direct search"> direct search</a>, <a href="https://publications.waset.org/abstracts/search?q=energy%20saving" title=" energy saving"> energy saving</a>, <a href="https://publications.waset.org/abstracts/search?q=improvement" title=" improvement"> improvement</a>, <a href="https://publications.waset.org/abstracts/search?q=mechanical%20efficiency" title=" mechanical efficiency"> mechanical efficiency</a>, <a href="https://publications.waset.org/abstracts/search?q=multi%20variables" title=" multi variables"> multi variables</a> </p> <a href="https://publications.waset.org/abstracts/36956/design-optimisation-of-a-novel-cross-vane-expander-compressor-unit-for-refrigeration-system" class="btn btn-primary btn-sm">Procedia</a> <a href="https://publications.waset.org/abstracts/36956.pdf" target="_blank" class="btn btn-primary btn-sm">PDF</a> <span class="bg-info text-light px-1 py-1 float-right rounded"> Downloads <span class="badge badge-light">373</span> </span> </div> </div> <div class="card paper-listing mb-3 mt-3"> <h5 class="card-header" style="font-size:.9rem"><span class="badge badge-info">9167</span> Production of Ultra-Low Temperature by the Vapor Compression Refrigeration Cycles with Environment Friendly Working Fluids</h5> <div class="card-body"> <p class="card-text"><strong>Authors:</strong> <a href="https://publications.waset.org/abstracts/search?q=Sameh%20Frikha">Sameh Frikha</a>, <a href="https://publications.waset.org/abstracts/search?q=Mohamed%20Salah%20Abid"> Mohamed Salah Abid</a> </p> <p class="card-text"><strong>Abstract:</strong></p> We investigate the performance of an integrated cascade (IC) refrigeration system which uses environment friendly zeotropic mixtures. Computational calculation has been carried out by varying pressure level at the evaporator and the condenser of the system. Effects of mass flow rate of the refrigerant on the coefficient of performance (COP) are presented. We show that the integrated cascade system produces ultra-low temperatures in the evaporator by using environment friendly zeotropic mixture. <p class="card-text"><strong>Keywords:</strong> <a href="https://publications.waset.org/abstracts/search?q=coefficient%20of%20performance" title="coefficient of performance">coefficient of performance</a>, <a href="https://publications.waset.org/abstracts/search?q=environment%20friendly%20zeotropic%20mixture" title=" environment friendly zeotropic mixture"> environment friendly zeotropic mixture</a>, <a href="https://publications.waset.org/abstracts/search?q=integrated%20cascade" title=" integrated cascade"> integrated cascade</a>, <a href="https://publications.waset.org/abstracts/search?q=ultra%20low%20temperature" title=" ultra low temperature"> ultra low temperature</a>, <a href="https://publications.waset.org/abstracts/search?q=vapor%20compression%20refrigeration%20cycles" title=" vapor compression refrigeration cycles"> vapor compression refrigeration cycles</a> </p> <a href="https://publications.waset.org/abstracts/40244/production-of-ultra-low-temperature-by-the-vapor-compression-refrigeration-cycles-with-environment-friendly-working-fluids" class="btn btn-primary btn-sm">Procedia</a> <a href="https://publications.waset.org/abstracts/40244.pdf" target="_blank" class="btn btn-primary btn-sm">PDF</a> <span class="bg-info text-light px-1 py-1 float-right rounded"> Downloads <span class="badge badge-light">261</span> </span> </div> </div> <div class="card paper-listing mb-3 mt-3"> <h5 class="card-header" style="font-size:.9rem"><span class="badge badge-info">9166</span> Study of Two Adsorbent-Refrigerant Pairs for the Application of Solar-Powered Adsorption Refrigeration System</h5> <div class="card-body"> <p class="card-text"><strong>Authors:</strong> <a href="https://publications.waset.org/abstracts/search?q=Mohammed%20Ali%20Hadj%20Ammar">Mohammed Ali Hadj Ammar</a>, <a href="https://publications.waset.org/abstracts/search?q=Fethi%20Bouras"> Fethi Bouras</a>, <a href="https://publications.waset.org/abstracts/search?q=Kamel%20Sahlaoui"> Kamel Sahlaoui</a> </p> <p class="card-text"><strong>Abstract:</strong></p> This article presents a detailed study of two working pairs intended for use in solar adsorption refrigeration (SAR) system. The study was based on two indicators: the daily production and coefficient of performance (COP). The thermodynamic cycle of the system is based on the adsorption phenomena at a constant temperature. A computer simulation program has been developed for modeling and performance evaluation for the solar-powered adsorption refrigeration cycle. It was found that maximal cycled mass is obtained by S40/water (0.280kg/kg) followed by CarboTech C40/1/methanol (0.260kg/kg). At a condenser temperature of 30°C, with an adsorbent mass of 38.59 kg, and an integrated collector/bed configuration, the couple CarboTech C40/1/methanol for the ice-maker purpose can reach cycle COP of 0.63 and can produce about 13.6kg ice per day, while the couple S40/water for the air-conditioning can reach cycle COP of 0.66 and 212kg as daily cold-water production. Additionally, adequate indicators are evaluated addressing the economic and environmental associated with each working pair. <p class="card-text"><strong>Keywords:</strong> <a href="https://publications.waset.org/abstracts/search?q=solar%20adsorption" title="solar adsorption">solar adsorption</a>, <a href="https://publications.waset.org/abstracts/search?q=refrigeration" title=" refrigeration"> refrigeration</a>, <a href="https://publications.waset.org/abstracts/search?q=activated%20carbon" title=" activated carbon"> activated carbon</a>, <a href="https://publications.waset.org/abstracts/search?q=silica%20gel" title=" silica gel"> silica gel</a> </p> <a href="https://publications.waset.org/abstracts/94738/study-of-two-adsorbent-refrigerant-pairs-for-the-application-of-solar-powered-adsorption-refrigeration-system" class="btn btn-primary btn-sm">Procedia</a> <a href="https://publications.waset.org/abstracts/94738.pdf" target="_blank" class="btn btn-primary btn-sm">PDF</a> <span class="bg-info text-light px-1 py-1 float-right rounded"> Downloads <span class="badge badge-light">131</span> </span> </div> </div> <div class="card paper-listing mb-3 mt-3"> <h5 class="card-header" style="font-size:.9rem"><span class="badge badge-info">9165</span> Friction Stir Welding Process as a Solid State Joining -A Review</h5> <div class="card-body"> <p class="card-text"><strong>Authors:</strong> <a href="https://publications.waset.org/abstracts/search?q=Mohd%20Anees%20Siddiqui">Mohd Anees Siddiqui</a>, <a href="https://publications.waset.org/abstracts/search?q=S.%20A.%20H.%20Jafri"> S. A. H. Jafri</a>, <a href="https://publications.waset.org/abstracts/search?q=Shahnawaz%20Alam"> Shahnawaz Alam</a> </p> <p class="card-text"><strong>Abstract:</strong></p> Through this paper an attempt is made to review a special welding technology of friction stir welding (FSW) which is a solid-state joining. Friction stir welding is used for joining of two plates which are applied compressive force by using fixtures over the work table. This is a non consumable type welding technique in which a rotating tool of cylindrical shape is used. Process parameters such as tool geometry, joint design and process speed are discussed in the paper. Comparative study of Friction stir welding with other welding techniques such as MIG, TIG & GMAW is also done. Some light is put on several major applications of friction stir welding in different industries. Quality and environmental aspects of friction stir welding is also discussed. <p class="card-text"><strong>Keywords:</strong> <a href="https://publications.waset.org/abstracts/search?q=friction%20stir%20welding%20%28FSW%29" title="friction stir welding (FSW)">friction stir welding (FSW)</a>, <a href="https://publications.waset.org/abstracts/search?q=process%20parameters" title=" process parameters"> process parameters</a>, <a href="https://publications.waset.org/abstracts/search?q=tool" title=" tool"> tool</a>, <a href="https://publications.waset.org/abstracts/search?q=solid%20state%20joining%20processes" title=" solid state joining processes "> solid state joining processes </a> </p> <a href="https://publications.waset.org/abstracts/24239/friction-stir-welding-process-as-a-solid-state-joining-a-review" class="btn btn-primary btn-sm">Procedia</a> <a href="https://publications.waset.org/abstracts/24239.pdf" target="_blank" class="btn btn-primary btn-sm">PDF</a> <span class="bg-info text-light px-1 py-1 float-right rounded"> Downloads <span class="badge badge-light">502</span> </span> </div> </div> <div class="card paper-listing mb-3 mt-3"> <h5 class="card-header" style="font-size:.9rem"><span class="badge badge-info">9164</span> Effect of White Roofing on Refrigerated Buildings</h5> <div class="card-body"> <p class="card-text"><strong>Authors:</strong> <a href="https://publications.waset.org/abstracts/search?q=Samuel%20Matylewicz">Samuel Matylewicz</a>, <a href="https://publications.waset.org/abstracts/search?q=K.%20W.%20Goossen"> K. W. Goossen</a> </p> <p class="card-text"><strong>Abstract:</strong></p> The deployment of white or cool (high albedo) roofing is a common energy savings recommendation for a variety of buildings all over the world. Here, the effect of a white roof on the energy savings of an ice rink facility in the northeastern US is determined by measuring the effect of solar irradiance on the consumption of the rink's ice refrigeration system. The consumption of the refrigeration system was logged over a year, along with multiple weather vectors, and a statistical model was applied. The experimental model indicates that the expected savings of replacing the existing grey roof with a white roof on the consumption of the refrigeration system is only 4.7 %. This overall result of the statistical model is confirmed with isolated instances of otherwise similar weather days, but cloudy vs. sunny, where there was no measurable difference in refrigeration consumption up to the noise in the local data, which was a few percent. This compares with a simple theoretical calculation that indicates 30% savings. The difference is attributed to a lack of convective cooling of the roof in the theoretical model. The best experimental model shows a relative effect of the weather vectors dry bulb temperature, solar irradiance, wind speed, and relative humidity on refrigeration consumption of 1, 0.026, 0.163, and -0.056, respectively. This result can have an impact on decisions to apply white roofing to refrigerated buildings in general. <p class="card-text"><strong>Keywords:</strong> <a href="https://publications.waset.org/abstracts/search?q=cool%20roofs" title="cool roofs">cool roofs</a>, <a href="https://publications.waset.org/abstracts/search?q=solar%20cooling%20load" title=" solar cooling load"> solar cooling load</a>, <a href="https://publications.waset.org/abstracts/search?q=refrigerated%20buildings" title=" refrigerated buildings"> refrigerated buildings</a>, <a href="https://publications.waset.org/abstracts/search?q=energy-efficient%20building%20envelopes" title=" energy-efficient building envelopes"> energy-efficient building envelopes</a> </p> <a href="https://publications.waset.org/abstracts/140844/effect-of-white-roofing-on-refrigerated-buildings" class="btn btn-primary btn-sm">Procedia</a> <a href="https://publications.waset.org/abstracts/140844.pdf" target="_blank" class="btn btn-primary btn-sm">PDF</a> <span class="bg-info text-light px-1 py-1 float-right rounded"> Downloads <span class="badge badge-light">129</span> </span> </div> </div> <div class="card paper-listing mb-3 mt-3"> <h5 class="card-header" style="font-size:.9rem"><span class="badge badge-info">9163</span> Thermodynamic Analysis of an Ejector-Absorption Refrigeration Cycle with Using NH3-H2O</h5> <div class="card-body"> <p class="card-text"><strong>Authors:</strong> <a href="https://publications.waset.org/abstracts/search?q=Samad%20Jafarmadar">Samad Jafarmadar</a>, <a href="https://publications.waset.org/abstracts/search?q=Amin%20Habibzadeh"> Amin Habibzadeh</a>, <a href="https://publications.waset.org/abstracts/search?q=Mohammad%20Mehdi%20Rashidi"> Mohammad Mehdi Rashidi</a>, <a href="https://publications.waset.org/abstracts/search?q=Sayed%20Sina%20Rezaei"> Sayed Sina Rezaei</a>, <a href="https://publications.waset.org/abstracts/search?q=Abbas%20Aghagoli"> Abbas Aghagoli</a> </p> <p class="card-text"><strong>Abstract:</strong></p> In this paper, the ejector-absorption refrigeration cycle is presented. This article deals with the thermodynamic simulation and the first and second law analysis of an ammonia-water. The effects of parameters such as condenser, absorber, generator, and evaporator temperatures have been investigated. The influence of the various operating parameters on the performance coefficient and exergy efficiency of this cycle has been studied. The results show that when the temperature of different parts increases, the performance coefficient and the exergy efficiency of the cycle decrease, except for evaporator and generator, that causes an increase in coefficient of performance (COP). According to the results, absorber and ejector have the highest exergy losses in the studied conditions. <p class="card-text"><strong>Keywords:</strong> <a href="https://publications.waset.org/abstracts/search?q=absorption%20refrigeration" title="absorption refrigeration">absorption refrigeration</a>, <a href="https://publications.waset.org/abstracts/search?q=COP" title=" COP"> COP</a>, <a href="https://publications.waset.org/abstracts/search?q=ejector" title=" ejector"> ejector</a>, <a href="https://publications.waset.org/abstracts/search?q=exergy%20efficiency" title=" exergy efficiency"> exergy efficiency</a> </p> <a href="https://publications.waset.org/abstracts/74176/thermodynamic-analysis-of-an-ejector-absorption-refrigeration-cycle-with-using-nh3-h2o" class="btn btn-primary btn-sm">Procedia</a> <a href="https://publications.waset.org/abstracts/74176.pdf" target="_blank" class="btn btn-primary btn-sm">PDF</a> <span class="bg-info text-light px-1 py-1 float-right rounded"> 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