Entropy Analysis of a R32/CO₂ Cascade Refrigeration Cycle

Abstract:

In order to study the performance of a R32/CO2 cascade refrigeration cycle, entropy generation minimization method was adopted to get the influence of some important operating and design parameters on the performance of the system and entropy generations of each component and the whole system, such as the evaporating temperature(Te), the condensing temperature(Tk) and the temperature difference in the cascade condenser(ΔT). The results indicate that there are a maximum COP and a minimum total entropy generation of the system at the optimal condensing temperature of the cascade condenser when Te, Tk and ΔT are constant. The total entropy generations of the throttling device, the condenser and the compressor of HTC, the cascade condenser and the compressor of LTC are above 80% of the total entropy generation of the whole system.

• Periodical: Applied Mechanics and Materials (Volumes 672-674)
• Pages: 1676-1679
• DOI: https://doi.org/10.4028/www.scientific.net/AMM.672-674.1676
• Online since: October 2014
• Authors: Jian Xiao, Ying Fu Liu
• Keywords: Cascade Refrigeration System, Entropy Analysis, Entropy Generation, R32/CO₂

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