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

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  • Yuyao Sun

    (College of Food Science and Technology, Shanghai Ocean University, Shanghai 201306, China
    Shanghai Professional Technology Service Platform on Cold Chain Equipment Performance and Energy Saving Evaluation, Shanghai 201306, China)

  • Jinfeng Wang

    (College of Food Science and Technology, Shanghai Ocean University, Shanghai 201306, China
    Shanghai Professional Technology Service Platform on Cold Chain Equipment Performance and Energy Saving Evaluation, Shanghai 201306, China
    Shanghai Engineering Research Center of Aquatic Product Processing & Preservation, Shanghai 201306, China)

  • Jing Xie

    (College of Food Science and Technology, Shanghai Ocean University, Shanghai 201306, China
    Shanghai Professional Technology Service Platform on Cold Chain Equipment Performance and Energy Saving Evaluation, Shanghai 201306, China
    Shanghai Engineering Research Center of Aquatic Product Processing & Preservation, Shanghai 201306, China
    National Experimental Teaching Demonstration Center for Food Science and Engineering, Shanghai Ocean University, Shanghai 201306, China)

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.

Suggested Citation

  • Yuyao Sun & Jinfeng Wang & Jing Xie, 2021. "Performance Optimizations of the Transcritical CO 2 Two-Stage Compression Refrigeration System and Influences of the Auxiliary Gas Cooler," Energies, MDPI, vol. 14(17), pages 1-17, September.
    • Handle: RePEc:gam:jeners:v:14:y:2021:i:17:p:5578-:d:630140
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    References listed on IDEAS

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    1. Paride Gullo, 2018. "Advanced Thermodynamic Analysis of a Transcritical R744 Booster Refrigerating Unit with Dedicated Mechanical Subcooling," Energies, MDPI, vol. 11(11), pages 1-26, November.
    2. Liu, Shengchun & Lu, Fenping & Dai, Baomin & Nian, Victor & Li, Hailong & Qi, Haifeng & Li, Jiayu, 2019. "Performance analysis of two-stage compression transcritical CO2 refrigeration system with R290 mechanical subcooling unit," Energy, Elsevier, vol. 189(C).
    3. Paride Gullo & Armin Hafner & Krzysztof Banasiak, 2019. "Thermodynamic Performance Investigation of Commercial R744 Booster Refrigeration Plants Based on Advanced Exergy Analysis," Energies, MDPI, vol. 12(3), pages 1-24, January.
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