Thermodynamic performance evaluation of the CO2 parallel compression supermarket refrigeration system with a subcooler

被引：16

作者：

Wang Zheng ^{[1
]}

Zhao Hongxia ^{[1
]}

Wang Xinli ^{[2
]}

Han Jitian ^{[1
]}

Lai Yanhua ^{[1
]}

机构：

[1] Shandong Univ, Sch Energy & Power Engn, Jinan 250061, Peoples R China

[2] Shandong Univ, Sch Control Sci & Engn, Jinan, Peoples R China

来源：

INTERNATIONAL JOURNAL OF ENERGY RESEARCH | 2020年 / 44卷 / 08期

基金：

中国国家自然科学基金;

关键词：

CO2; medium and low temperature; parallel compression; subcooler; supermarket refrigeration system; trans-critical; ENERGY; OPTIMIZATION; DESIGN; CYCLE;

D O I：

10.1002/er.5408

中图分类号：

TE [石油、天然气工业]; TK [能源与动力工程];

学科分类号：

0807 ; 0820 ;

摘要：

Commercial refrigeration systems in supermarkets are intensive users of energy and CO2 is recognized as the most promising refrigerant such systems. The CO2 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 CO2 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.

引用

页码：6709 / 6724

页数：16

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