跨临界CO_(2)与R1234yf低环温高温热泵热水系统性能分析  

Performance Analysis of Transcritical CO_(2)and R1234yf High Temperature Heat Pump Water Heater at Low Ambient Temperature

作　　者：张宁[1] 李敏霞[1] 马一太[1] 党超镔 王派[1] 王启帆 宋瑞涛 秦鹏伟 Zhang Ning;Li Minxia;Ma Yitai;Dang Chaobin;Wang Pai;Wang Qifan;Song Ruitao;Qin Pengwei(School of Mechanical Engineering,Tianjin University,Tianjin,300072,China;School of Engineering,University of Fukui,Fukui,9100017,Japan)

机构地区：[1]天津大学机械工程学院,天津300072 [2]福井大学工学系研究科,福井9100017

出　　处：《制冷学报》2023年第4期85-92,119,共9页Journal of Refrigeration

基　　金：国家重点研发计划(2021YFF0306801,2021YFF0306805)资助项目。

摘　　要：热泵中采用环境友好型工质可以减少对臭氧层的破坏,在低环境温度的条件下,在已有热泵系统的基础上,可使用CO_(2)跨临界循环,并采用机械过冷。基于此,本文提出了R1234yf/CO_(2)机械过冷热泵系统(MSHPS)、CO_(2)/R1234yf双气冷器机械过冷热泵系统(DMSHPS)和CO_(2)双级压缩三气冷器热泵系统(TSCHPS)。通过建立热力学模型,对采用CO_(2)和R1234yf的系统制热性能进行分析,通过最优排气压力、蒸发温度、冷凝温度、辅循环和主循环流量比等条件,对同一系统和不同系统间的性能进行分析。本文将R1234yf替换为R134a,对比MSHPS和DMSHPS中采用R1234yf和R134a的制热性能,结果表明:MSHPS和DMSHPS两个系统中R1234yf和R134a的制热性能基本相当。In heat pumps,the use of environmentally friendly refrigerants can reduce damage to the ozone layer.Under the condition of low ambient temperature,based on the existing heat pump system,the CO_(2)transcritical cycle and mechanical subcooling were adopted.An R1234yf/CO_(2)mechanical subcooling heat pump system(MSHPS),a CO_(2)/R1234yf double air cooler mechanical subcooling heat pump system(DMSHPS),and a CO_(2)two-stage compression triple air cooler heat pump system(TSCHPS)are proposed in this study.By establishing a thermodynamic model,the heating performance of the system using CO_(2)and R1234yf was analyzed.Furthermore,the performance of different systems was analyzed through the optimal discharge pressure,evaporating temperature,condensing temperature,and flow rate ratio of the auxiliary cycle and main cycle.In this study,R1234yf was replaced with R134a;the heating performances of R1234yf and R134a in the MSHPS and DMSHPS were compared and found to be similar.

关 键 词：热泵 CO_(2)跨临界 机械过冷 R1234yf 制热性能 热力学分析 

分 类 号：TK123[动力工程及工程热物理—工程热物理] TK124[动力工程及工程热物理—热能工程] TB657.5[一般工业技术—制冷工程]