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

R744-R717 캐스케이드 냉동시스템에서 운전조건 변화에 따른 성능 해석

  • Received : 2015.02.12
  • Accepted : 2015.08.12
  • Published : 2015.10.10

Abstract

The evaporating temperature range required for the low temperature freezing system is from $-50^{\circ}C$ to $-30^{\circ}C$. 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 $-5^{\circ}C$, and maximum COP was 1.13 when the temperature difference of the cascade heat exchanger was $5^{\circ}C$. In addition, the total system COP increased by 1.17 when the cascade temperature gap was $3^{\circ}C$ at the middle temperature of $-7.5^{\circ}C$.

Keywords

Cascade refrigeration system;Carbon dioxide;Ammonia;COP

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