冷水源侧进水温度对CO_(2)跨临界热泵系统性能的影响  

Influence of cooling water temperature of transcritical carbon dioxide heat pump on system performance

作　　者：刘泽勤[1] 甄惠然 韩凯悦 张艺 LiuZeqin;Zhen Huiran;Han Kaiyue;Zhang Yi(Tianjin University of Commerce;Engineering Research Center of the Ministry of Education of Refrigeration Technology;Key Laboratory of Tianjin Refrigeration Technology;Engineering Center of Tianjin Refrigeration Technology)

机构地区：[1]天津商业大学 [2]冷冻冷藏技术教育部工程研究中心 [3]天津市制冷技术重点实验室 [4]天津市制冷技术工程中心

出　　处：《区域供热》2021年第6期80-86,117,共8页District Heating

摘　　要：为改善环境污染问题,我国热泵技术因其环保性被广泛发展应用。本文探究冷水源侧进水温度变化时对CO_(2)跨临界热泵系统性能影响。保持冷水源侧出水温度和外界环境温度不变,改变冷水源侧进水温度,测量水流量、温度和压缩机功率等参数,并通过公式计算系统制热量、COP和气冷器热交换完善度,探究规律。通过实验测得:随着冷水源侧进水温度从14℃增加到42℃,进水流量增加显著,实际冷水源侧出水温度提高1.82%,气冷器CO_(2)侧的出口温差降低25.53%,进而计算可得气冷器热交换完善度增加15.07%;压缩机排气压力增长15.38%,这势必使得排气温度提升11.39%,造成耗功量增加12.62%;进一步计算得出系统制热量下降26.09%,系统COP减小35.56%。因此,合理设计冷水源侧进水温度对CO_(2)空气源热泵系统性能的提升有较大意义。To improve the problem of environmental pollution,heat pump technology in China has been widely developed and applied because of its environmental protection.In this paper, the performance of CO_(2) transcritical heat pump system changes with the change of cooling water inlet temperature.The water outlet temperature and the ambient temperature of the air cooler were kept unchanged,the cooling water temperature was changed,parameters such as water flow rate,temperature and compressor power were measured,and the system heat production,heat exchange perfection degree of the air cooler and the COP of the system were calculated by formula,and the variation rules were summarized.The experimental results showed that as the cooling water temperature increased from 14 ℃ to 42 ℃,the cooling water inlet increased significantly,the actual water outlet temperature of the air cooler increased by 1.82%,and the temperature side of CO_(2)entrance and exit of the air cooler decreased by 25.53%.Then,the heat exchange perfection of the air cooler increased by 15.07%.The exhaust pressure of the compressor increases by 15.38%, which is bound to increase the exhaust temperature by 11.39%, resulting in a 12.62% increase in power consumption.Further calculation showed that the heat produced by the system decreased by 26. 09%, and the COP of the system decreased by 35. 56%. Therefore, reasonable design of cooling water temperature is of great significance to improve the performance of CO_(2)air source heat pump heating system.

关 键 词：进水温度 空气源热泵 系统性能 气体冷却器 

分 类 号：TU83[建筑科学—供热、供燃气、通风及空调工程]