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Commenced in January 2007 Frequency: Monthly Edition: International Publications Count: 29284


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1251
Thermodynamic Analysis of R507A-R23 Cascade Refrigeration System
Abstract:
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.
Digital Object Identifier (DOI):

References:

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[5] Zhang, Y., Gong, M.Q., Zhu, H.B., Wu, J.F Vapor-liquid equilibrium data for the ethane + trifluoromethane system at temperatures from 188.31 K to 243.76 K. Journal of Chemical and Engineering Data, vol. 51 (4), 2006, pp. 1411-1414.
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[7] DiNicola, G., Giuliani, G., Polonara, F., Santori, G., Stryjek, R. Cascade Cycles Operating with CO2 + N2O Binary Systems as Low Temperature Fluid: Experimental Results, International Congress of Refrigeration, 2007, Beijing.
[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.
[10] Keumnam Cho, Jonghoon Park, Honggi Cho, Performance of the cascade system using alternative refrigerants, in: Proceeding of ASMENTC01 35th National Heat Transfer Conference, Anaheim, California (2001), pp. P595-P600.
[11] Giovanni Di Nicola, Giuliano Giuliani, Fabio Polonara, Roman Stryjek, Blends of carbon dioxide and HFCs as working fluids for the lowtemperature circuit in cascade refrigerating systems, Int J Refrigeration 28 (2005) 130-140.
[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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