Commenced in January 2007
Paper Count: 30172
Numerical Simulation of Heat Exchanger Area of R410A-R23 and R404A-R508B Cascade Refrigeration System at Various Evaporating and Condensing Temperature
Abstract:Capacity and efficiency of any refrigerating system diminish rapidly as the difference between the evaporating and condensing temperature is increased by reduction in the evaporator temperature. The single stage vapour compression refrigeration system is limited to an evaporator temperature of -40 0C. Below temperature of -40 0C the either cascade refrigeration system or multi stage vapour compression system is employed. Present work describes thermal design of main three heat exchangers namely condenser (HTS), cascade condenser and evaporator (LTS) of R404A-R508B and R410A-R23 cascade refrigeration system. Heat transfer area of condenser (HTS), cascade condenser and evaporator (LTS) for both systems have been compared and the effect of condensing and evaporating temperature on heat-transfer area for both systems have been studied under same operating condition. The results shows that the required heat-transfer area of condenser and cascade condenser for R410A-R23 cascade system is lower than the R404A-R508B cascade system but heat transfer area of evaporator is similar for both the system. The heat transfer area of condenser and cascade condenser decreases with increase in condensing temperature (Tc), whereas the heat transfer area of cascade condenser and evaporator increases with increase in evaporating temperature (Te).
Digital Object Identifier (DOI): doi.org/10.5281/zenodo.1329677Procedia APA BibTeX Chicago EndNote Harvard JSON MLA RIS XML ISO 690 PDF Downloads 2008
 Roy J.Dossat " principle of refrigeration." (1997) 444-445.
 P.Byrne, J.Miriel, Y. Lenat, Design and simulation of a heat pump for simultaneous heating and cooling using HFC or CO2 as a working fluid, Int.J.Ref, 12, 2009, 1-13.
 C.Apreaa, F Rossib, A. Grecoc, Experimental evaluation of R22 and R407C evaporative heat transfer coefficients in a vapour compression plant, Int.J.Ref, 23, 2000, 366-377.
 J.R Khan, S.M.Zubair, Design and performance evaluation of reciprocating refrigeration systems, Int.J.Ref, 22, 1999, 235-243.
 Piotr A. Domanski and David Yashar, Optimization of finned-tube condensers using an intellengent system, Int.J.of Ref, 30,2007,482-488.
 Y. Liang, M.W Tonga, X Zengc, Design and analysis of multiple parallel-pass condensers, Int.J.Ref, 32, 2009,1153- 1161.
 M.M. Nasr, M. Salah Hassan, "Experimental and theoretical investigation of an innovative evaporative condenser for residential refrigerator." Renewable energy 34 (2009) 2447 -2454.
 C P Arora, "Refrigeration and air-conditioning" by Tata Mcgraw hill (2005) 301-310.
 Chato J C, AHREA J. Feb. (1962) 52.
 Chawla J M, " correlations of convective heat transfer coefficient for two-phase liquid-vapour flow". Heat Transfer, proceeding of the international conference on Heat Transfer, paris Vol. V, (1970), paper B 5-7.
 Rohsenow W M, "A method of correlating heat transfer data for surface boiling of liquids", Trans. ASME, Vol. 74, 1952.
 Dittus F W and Boelter, LMK, Univ. Calif. (Berkeley) pub. Eng., Vol. 2 (1930), p. 443.
 Grimson E D, "Correlation and utilization of new data on flow resistance and heat transfer for cross-flow of gasee over tube banks", Trans. ASME, Vol. 59, (1937), pp. 583-594.
 S. A. Klien, Engineering Equation Solver, commercial V7.027.