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Performance Simulation of a R744-R717 Cascade Refrigeration System According to Operating Conditions
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Performance Simulation of a R744-R717 Cascade Refrigeration System According to Operating Conditions
Ryu, Jiho; Cho, Honghyun;
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The evaporating temperature range required for the low temperature freezing system is from to . 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 , and maximum COP was 1.13 when the temperature difference of the cascade heat exchanger was . In addition, the total system COP increased by 1.17 when the cascade temperature gap was at the middle temperature of .
Cascade refrigeration system;Carbon dioxide;Ammonia;COP;
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