Numerical Simulation of R410a-R23 and R404A-R508B Cascade Refrigeration System

Authors: A. D. Parekh, P. R. Tailor, Tejendra Patel

Abstract:

Capacity and efficiency of any refrigerating system diminish rapidly as the difference between the evaporating and condensing temperature is increased by a reduction in the evaporator temperature. The single stage vapour compression refrigeration system using various refrigerants are 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 condenser (HTS), cascade condenser and evaporator (LTS) of R404A-R508B and R410A-R23 cascade refrigeration system. Heat transfer area of condenser, cascade condenser and evaporator for both systems are compared and the effect of condenser and evaporator temperature on heat-transfer area for both systems is 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 condenser temperature (Tc), whereas the heat transfer area of cascade condenser and evaporator increases with increase in evaporator temperature (Te).

Keywords: Heat-transfer area, R410A, R404A, R508B, R23, Refrigeration system, Thermal design

Digital Object Identifier (DOI): doi.org/10.5281/zenodo.1327486

References:

[1] Roy J.Dossat " principle of refrigeration." (1997) 444-445.
[2] M.M. Nasr, M. Salah Hassan, "Experimental and theoretical investigation of an innovative evaporative condenser for residential refrigerator." Renewable energy 34 (2009) 2447 -2454.
[3] H.M. Getu, P.K. Bansal*"Thermodynamic analysis of an R744-R717 cascade refrigeration system", International journal of refrigeration 31 ( 2008 ) 45 - 54.
[4] C P Arora, "Refrigeration and air-conditioning" by Tata Mcgraw hill (2005) 301-310.
[5] Chato J C, AHREA J. Feb. (1962) 52.
[6] 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.
[7] Rohsenow W M, "A method of correlating heat transfer data for surface boiling of liquids", Trans. ASME, Vol. 74, 1952.
[8] Dittus F W and Boelter, LMK, Univ. Calif. (Berkeley) pub. Eng., Vol. 2 (1930), p. 443.
[9] 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.