非共沸工质CO2/R1234yf商超增压制冷系统性能分析
Performance of Supermarket Booster Refrigeration System Using the Zeotropic Working Fluid CO2/R1234yf
滑雪 1吴天昊 2代宝民 2刘圣春2
作者信息
- 1. 生态环境部对外合作与交流中心 北京 100035
- 2. 天津商业大学 天津市制冷技术重点实验室 天津 300134
- 折叠
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(火用)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(火用)效率,为 0.18,相比纯CO2 系统提升 4.62%.
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.
关键词
商超增压制冷系统/非共沸工质/CO2/R1234yf/年性能系数/(火用)分析/能效提升Key words
supermarket booster refrigeration system/zeotropic working fluid/CO2/R1234yf/annual performance factor/exergy analy-sis/energy efficiency improvement引用本文复制引用
出版年
2024
国家科技期刊平台
NSTL
万方数据