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http://dx.doi.org/10.5762/KAIS.2014.15.2.625

Performance comparison of cascade refrigerator and two-stage compression refrigerator  

Son, Chang-Hyo (Department of Refrigeration and Air-conditioning Engineering, Pukyoung National University)
Publication Information
Journal of the Korea Academia-Industrial cooperation Society / v.15, no.2, 2014 , pp. 625-631 More about this Journal
Abstract
In order to obtain a low evaporation temperature ranging from $-30^{\circ}C{\sim}-50^{\circ}C$, a cascade refrigeration system and two-stage compression one-stage expansion refrigeration system is required. However, the research results of performance comparison of these refrigeration system are very scarce. This paper were compared the performance characteristics of R744-R404A cascade refrigeration system and R404A two-stage compression refrigeration system. The COP of R404A two-stage compression refrigeration system is about 36~57% greater than that of R744-R404A cascade refrigeration system in the range of evaporation temperature of $-30^{\circ}C{\sim}-50^{\circ}C$. But R404A two-stage compression refrigeration system is unstable because COP is significantly changed when evaporating temperature and compressor efficiency decreased. In particular, when compressor efficiency decreased, COP is significantly decreased. In this case, not efficient for long-term use. Whereas R744-R404A cascade refrigeration system using natural refrigerants. Therefore, it is environmentally friendly. And this system is high-efficiency refrigeration system. The reason it can be configured by selecting the suitable refrigerant at high-temperature side and low-temperature side. From the above results, select the appropriate low temperature refrigeration system by considering the environmental and performance aspects.
Keywords
Cascade refrigeration system; COP; Two-stage compression refrigeration system; R404A; R744;
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