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非共沸工质CO2/R1234yf商超增压制冷系统性能分析
滑雪1, 吴天昊2, 代宝民2, 刘圣春2
0
(1.生态环境部对外合作与交流中心;2.天津商业大学 天津市制冷技术重点实验室)
摘要:
为满足商超制冷领域系统能效提升和制冷剂替代的需求,提出了非共沸工质CO2/R1234yf商超增压制冷系统,通过建立热力学模型,与纯CO2商超增压制冷系统进行对比。结果表明:CO2/R1234yf商超增压制冷系统可在最优的CO2质量分数(0.94)及最优排气压力(8.81 MPa)下获得最大COP(1.40);CO2/R1234yf商超增压制冷系统COP与纯CO2系统相比具有显著提升,环境温度为35 ℃时,提升7.25%;CO2/R1234yf商超增压制冷系统APF提升率为2.68%~4.72%,系统APF随典型城市所处纬度的增加而增大。CO2/R1234yf商超增压系统?效率随CO2质量分数的增加呈先增后减趋势,CO2质量分数为0.95时获得最高?效率,为0.18,相比纯CO2系统提升4.62%
关键词:  商超增压制冷系统  非共沸工质  CO2/R1234yf  年性能系数  㶲分析  能效提升
DOI:
投稿时间:2023-06-26  修订日期:2023-08-15   录用日期:2023-08-25
基金项目:国家自然科学基金(51806151),生态环境部对外合作与交流中心资助项目(No. C/III/S/19/052)资助项目。
Performance of Supermarket Booster Refrigeration System Using the Zeotropic Working Fluid CO2/R1234yf
Hua Xue1, Wu Tianhao2, Dai Baomin2, Liu Shengchun2
(1.Foreign Environmental Cooperation Center, Ministry of Ecology and Environment of China;2.Tianjin Key Laboratory of Refrigeration Technology, Tianjin University of Commerce)
Abstract:
To meet the need for energy efficiency improvement and substitution of traditional refrigerants in the field of supermarket refrigeration, a supermarket booster refrigeration system using the eco-friendly zeotropic refrigerant CO2/R1234yf is proposed in this study. A thermodynamic model is established and compared with that of a pure CO2 booster refrigeration system. The results show that the maximum COP (1.40) of the system using CO2/R1234yf was obtained under the optimal CO2 mass fraction (0.94) and discharge pressure (8.81 MPa). The COP of the CO2/R1234yf booster refrigeration system was significantly improved compared with the pure CO2 system, which increased by 7.25% when the ambient temperature was 35 ℃. The APF improvement of the CO2/R1234yf booster system was 2.68%–4.72%. The APF increased with an increase in the latitude of typical cities. The exergy efficiency of the CO2/R1234yf booster system first increased and then decreased with increasing CO2 mass fraction. The CO2/R1234yf booster refrigeration system exhibited the highest exergy efficiency (0.18) when the CO2 mass fraction was 0.95, which was 4.62% higher than that of the CO2 system.
Key words:  supermarket booster refrigeration system  zeotropic working fluid  CO2/R1234yf  annual performance factor  exergy analysis  energy efficiency improvement

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