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Thermodynamic performance evaluation of the CO 2 parallel compression supermarket refrigeration system with a subcooler
Author(s) -
Wang Zheng,
Zhao Hongxia,
Wang Xinli,
Han Jitian,
Lai Yanhua
Publication year - 2020
Publication title -
international journal of energy research
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.808
H-Index - 95
eISSN - 1099-114X
pISSN - 0363-907X
DOI - 10.1002/er.5408
Subject(s) - exergy , refrigeration , gas compressor , coefficient of performance , exergy efficiency , refrigerant , process engineering , vapor compression refrigeration , environmental science , efficient energy use , compression (physics) , energy consumption , energy conservation , computer science , engineering , thermodynamics , mechanical engineering , physics , electrical engineering
Summary Commercial refrigeration systems in supermarkets are intensive users of energy and CO 2 is recognized as the most promising refrigerant such systems. The CO 2 parallel compression system has been considered in medium‐ and low‐temperature supermarket refrigeration systems, with auxiliary compressors to enhance system performance. This study is intended to investigate the effects of adding a subcooler in a CO 2 trans‐critical supermarket refrigeration system with parallel compression (SPR system). Mathematical models based on mass and energy conservation are built. Optimization is performed for the gas cooler pressure and the receiver pressure for maximizing the coefficient of performance (COP). The performance of the parallel compression system with a subcooler is analyzed and compared to a baseline parallel compression system in different cities of China. A 6.8% average promotion at least in seasonal energy efficiency ratio (SEER) is predicted, and the energy consumption of the whole system decreases 7.1% totally in Haikou. Gas cooler, taking up 63.3% of the total exergy destruction rate, is the key component to increase efficiency through exergy analysis.