非共沸工质双压冷凝热泵热水器性能研究  

PERFORMANCE OF DUAL-PRESSUR CONDENSATION HEAT PUMP WATER HEATER USING NON-ZEOTROPIC WORKING MEDIUM

作　　者：代宝民 刘笑 刘圣春[1] 冯一宁 刘佳 肖鹏 Dai Baomin;Liu Xiao;Liu Shengchun;Feng Yining;Liu Jia;Xiao Peng(Tianjin Key Laboratory of Refrigeration Technology,Tianjin University of Commerce,Tianjin 300134,China;Danhua Hongye Refrigeration Technology Co.,Ltd.,Tianjin 300131,China)

机构地区：[1]天津商业大学天津市制冷技术重点实验室,天津300134 [2]天津市丹华宏业制冷技术有限公司,天津300131

出　　处：《太阳能学报》2023年第2期344-352,共9页Acta Energiae Solaris Sinica

基　　金：国家自然科学基金(51806151);天津市自然科学(20JCQNJC00600);大学生创新创业训练项目(202110069067)。

摘　　要：提出一种双压冷凝梯级加热热泵热水器(DPS)系统新构型,采用碳氢非共沸工质作为制冷剂,可实现热水的连续梯级低损加热,采用黄金分割法对系统热力性能进行优化。结果表明,非共沸工质的DPS系统的热力学性能优于纯质的DPS系统和单级热泵系统,双压冷凝系统在最优中间水温时取得最大COP。名义工况下,采用R600/R601a(40/60)的DPS系统COP高达5.17,相对采用纯质的DPS系统和单级系统分别提高9.45%和14.25%。采用温度滑移合理的非共沸工质可显著减少损,改善冷凝器的热匹配特性,系统效率最高提升11.70%,名义工况下推荐R600/R601a(40/60)作为工质对。A new configuration of dual-pressure condensation heat pump water heater system(DPS)is proposed,and hydrocarbon(HC)zeotropic working medium is used as refrigerant. Therefore,the water is heated continously step by step with low exergy destruction in the condenser. Then,the thermal performance of the system is optimized by golden section method. The results indicate that the thermodynamic with pure refrigerant. The dual-pressure condensation system obtains the maximum coefficient of performance(COP)at the optimal intermediate water temperature. Under the normal working condition of the heat pump water heater,the COP of DPS system using R600/R601a(40/60)is as high as 5.17,which is 9.45% and 14.25% higher than that of DPS system and the singlestage system with pure refrigerant,respectively. When non-zeotropic working medium with suitable temperature glide is used,the exergy destruction can be significantly reduced to improve thermal matching of the condenser,the exergy efficiency of the overall system is enhanced by up to 11.70%. Consequently,it is recommended that R600/R601a(40/60)is the best candidate for water heater heat pump under normal working condition.

关 键 词：制冷剂 热泵系统 碳氢化合物 能效 温度匹配 

分 类 号：TK121[动力工程及工程热物理—工程热物理]