{"title":"Numerical Simulation of R410a-R23 and R404A-R508B Cascade Refrigeration System","authors":"A. D. Parekh, P. R. Tailor, Tejendra Patel","volume":46,"journal":"International Journal of Mechanical and Mechatronics Engineering","pagesStart":964,"pagesEnd":969,"ISSN":"1307-6892","URL":"https:\/\/publications.waset.org\/pdf\/26","abstract":"Capacity and efficiency of any refrigerating system\r\ndiminish rapidly as the difference between the evaporating and\r\ncondensing temperature is increased by a reduction in the evaporator\r\ntemperature. The single stage vapour compression refrigeration\r\nsystem using various refrigerants are limited to an evaporator\r\ntemperature of -40 0C. Below temperature of -40 0C the either\r\ncascade refrigeration system or multi stage vapour compression\r\nsystem is employed. Present work describes thermal design of\r\ncondenser (HTS), cascade condenser and evaporator (LTS) of\r\nR404A-R508B and R410A-R23 cascade refrigeration system. Heat\r\ntransfer area of condenser, cascade condenser and evaporator for\r\nboth systems are compared and the effect of condenser and\r\nevaporator temperature on heat-transfer area for both systems is\r\nstudied under same operating condition. The results shows that the\r\nrequired heat-transfer area of condenser and cascade condenser for\r\nR410A-R23 cascade system is lower than the R404A-R508B cascade\r\nsystem but heat transfer area of evaporator is similar for both the\r\nsystem. The heat transfer area of condenser and cascade condenser\r\ndecreases with increase in condenser temperature (Tc), whereas the\r\nheat transfer area of cascade condenser and evaporator increases with\r\nincrease in evaporator temperature (Te).","references":"[1] Roy J.Dossat \" principle of refrigeration.\" (1997) 444-445.\r\n[2] M.M. Nasr, M. Salah Hassan, \"Experimental and theoretical\r\ninvestigation of an innovative evaporative condenser for residential\r\nrefrigerator.\" Renewable energy 34 (2009) 2447 -2454.\r\n[3] H.M. Getu, P.K. Bansal*\"Thermodynamic analysis of an R744-R717\r\ncascade refrigeration system\", International journal of refrigeration 31 (\r\n2008 ) 45 - 54.\r\n[4] C P Arora, \"Refrigeration and air-conditioning\" by Tata Mcgraw hill\r\n(2005) 301-310.\r\n[5] Chato J C, AHREA J. Feb. (1962) 52.\r\n[6] Chawla J M, \" correlations of convective heat transfer coefficient for\r\ntwo-phase liquid-vapour flow\". Heat Transfer, proceeding of the\r\ninternational conference on Heat Transfer, paris Vol. V, (1970), paper B\r\n5-7.\r\n[7] Rohsenow W M, \"A method of correlating heat transfer data for surface\r\nboiling of liquids\", Trans. ASME, Vol. 74, 1952.\r\n[8] Dittus F W and Boelter, LMK, Univ. Calif. (Berkeley) pub. Eng., Vol. 2\r\n(1930), p. 443.\r\n[9] Grimson E D, \"Correlation and utilization of new data on flow resistance\r\nand heat transfer for cross-flow of gasee over tube banks\", Trans.\r\nASME, Vol. 59, (1937), pp. 583-594.","publisher":"World Academy of Science, Engineering and Technology","index":"Open Science Index 46, 2010"}