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Thermodynamic Analysis of R507A-R23 Cascade Refrigeration System
The present work deals with thermodynamic analysis of cascade refrigeration system using ozone friendly refrigerants pair R507A and R23. R507A is azeotropic mixture composed of HFC refrigerants R125/R143a (50%/50% wt.). R23 is a single component HFC refrigerant used as replacement to CFC refrigerant R13 in low temperature applications. These refrigerants have zero ozone depletion potential and are non-flammable and as R507A an azeotropic mixture there is no problem of temperature glide. This study thermodynamically analyzed R507A-R23 cascade refrigeration system to optimize the design and operating parameters of the system. The design and operating parameters include: Condensing, evaporating, subcooling and superheating temperatures in the high temperature circuit, temperature difference in the cascade heat exchanger, Condensing, evaporating, subcooling and superheating temperatures in the low temperature circuit.
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[8] Baolian Niu, Yufeng Zhang, Experimental study of the refrigeration cycle performance for the R744/R290 mixtures, International Journal of Refrigeration, vol. 30, 2007, pp.37-42.
[9] George L. Molenaar, Use of R-22/23 in lieu of R502/13 in a cascade refrigeration system, in: Proceedings of ASMENTC01 35th National Heat Transfer Conference, Anaheim, California (2001), pp. P243-P246.
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[12] Robert Paul Wadell, Design of compact evaporators for ultra low temperature thermal management of microprocessors, Master thesis, Georgia Institute of Technology, 2005.
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