Performance Simulation of a R744-R717 Cascade Refrigeration System According to Operating Conditions

Title & Authors
Performance Simulation of a R744-R717 Cascade Refrigeration System According to Operating Conditions
Ryu, Jiho; Cho, Honghyun;

Abstract
The evaporating temperature range required for the low temperature freezing system is from $\small{-50^{\circ}C}$ to $\small{-30^{\circ}C}$. Since it is difficult to keep the required capacity in a cabinet, it is advantageous to design the system using a cascade refrigeration system. Use of carbon dioxide and ammonia would be advantageous since ammonia is an environment-friendly working fluid and has a high capacity for performance improvement. To investigate the performance characteristics of the R744-R717 cascade refrigeration system, a theoretical model was developed and performance was analyzed according to cascade heat exchanger operating temperature. The optimal cascade R744 condensing temperature was $\small{-5^{\circ}C}$, and maximum COP was 1.13 when the temperature difference of the cascade heat exchanger was $\small{5^{\circ}C}$. In addition, the total system COP increased by 1.17 when the cascade temperature gap was $\small{3^{\circ}C}$ at the middle temperature of $\small{-7.5^{\circ}C}$.
Keywords
Language
Korean
Cited by
1.
Recent Progress in Air-Conditioning and Refrigeration Research : A Review of Papers Published in the Korean Journal of Air-Conditioning and Refrigeration Engineering in 2015, Korean Journal of Air-Conditioning and Refrigeration Engineering, 2016, 28, 6, 256
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