Performance Optimizations of the Transcritical CO 2 Two-Stage Compression Refrigeration System and Influences of the Auxiliary Gas Cooler

Yuyao Sun, Jinfeng Wang and Jing Xie
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Yuyao Sun: College of Food Science and Technology, Shanghai Ocean University, Shanghai 201306, China
Jinfeng Wang: College of Food Science and Technology, Shanghai Ocean University, Shanghai 201306, China
Jing Xie: College of Food Science and Technology, Shanghai Ocean University, Shanghai 201306, China

Energies, 2021, vol. 14, issue 17, 1-17

Abstract: To optimize the performance of the transcritical CO 2 two-stage compression refrigeration system, the energy analysis and the exergy analysis are conducted. It is found that higher COP, lower compression power, and less exergy destruction can be achieved when the auxiliary gas cooler is applied. Moreover, the discharge temperature of the compound compressor (HPS) can be reduced by decreasing the temperature at the outlet of the auxiliary gas cooler ( T a g c , o u t ) . When the T a g c , o u t is reduced from 30 to 12 ° C , the discharge temperature of the compound compressor (HPS) can be decreased by 13.83 ° C . Furthermore, the COP and the exergy efficiency can be raised by enhancing the intermediate pressure. Based on these results, the optimizations of system design and system operation are put forward. The application of the auxiliary gas cooler can improve the performance of the transcritical CO 2 two-stage compression refrigeration system. Operators can decrease the discharge temperature of the compound compressor (HPS) by reducing the T a g c , o u t , and increase the COP and the exergy efficiency by enhancing the intermediate pressure.

Keywords: energy analysis; exergy analysis; coefficient of performance; exergy efficiency; auxiliary gas cooler; intermediate pressure (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2021
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