大滑移温度CO_(2)非共沸工质余热回收热泵热水系统实验研究  

Experimental Investigation of Heat Pump Water Heater Using CO_(2) Zeotropic Mixture with Large Temperature Glide for Waste Heat Recovery

作　　者：张涛[1] 吴嘉峰[1] 刘剑[1] 张小松[1] 李明霞[1] Zhang Tao;Wu Jiafeng;Liu Jian;Zhang Xiaosong;Li Mingxia(School of Energy and Environment,Southeast University,Nanjing,211189,China)

机构地区：[1]东南大学能源与环境学院,南京211189

出　　处：《制冷学报》2024年第4期21-27,共7页Journal of Refrigeration

基　　金：国家自然科学基金(51976033)资助项目;中央高校基本科研业务费专项资金项目(2242024K30007);江苏省自然科学基金项目(BK20230846)资助

摘　　要：通过热泵技术将生产/生活中的低品位余热提质增效具有广泛的应用潜力。其中,非共沸工质能够实现热泵循环换热过程中的温度匹配,实现余热资源的深度利用。基于水源热泵热水实验台对基于大滑移温度的CO_(2)/R1234yf、CO_(2)/R290、CO_(2)/R600a和CO_(2)/R32非共沸工质进行实验分析,并以R290工质作为对照,研究蒸发器与冷凝器同时满足大温差情况下的热泵性能表现。结果表明:非共沸工质充注量主要影响循环过冷度,进而影响系统COP,当CO_(2)/R1234yf的质量分数为15%/85%时,循环存在最优充注量,在实验工况(热源进水温度25℃,出水温度5℃;热汇进水温度15℃,出水温度45℃)下最优充注量对应的COP为7.66。同时,在实验工况下,相较于R290单工质,CO_(2)/R290工质对最优COP提升了75.2%,对应q v(单位容积制热量)提升了107.7%;CO_(2)/R1234yf工质对最优COP提升了27.7%,对应q v提升了92.0%;CO_(2)/R32工质对最优COP提升了15.0%;而CO_(2)/R600a工质对最优COP仅提升1.7%,应用潜力较低。Heat pump technology can be used to upgrade and enhance the quality of low-grade waste heat in production and daily life.Zeotropic mixtures can achieve temperature matching during the heat exchange process of heat pump cycles,which realizes in-depth utilization of waste heat resources.This study conducts an experimental analysis of CO_(2)/R1234yf,CO_(2)/R290,CO_(2)/R600a,and CO_(2)/R32 zeotropic mixtures using a water-source heat pump experimental system.The performances of heat pumps with evaporators and condensers that simultaneously satisfy high-temperature differences were investigated using the zeotropic mixture.Results show that the amount of charge in the zeotropic mixture primarily affects the degree of cycle subcooling,thereby influencing the coefficient of performance(COP)of the system.When the mass composition of CO_(2)/R1234yf is 15%/85%,an optimal refrigerant charge,which corresponds to a COP of 7.66 under the experimental condition(heat source inlet water temperature at 25℃,outlet at 5℃;heat sink inlet water temperature at 15℃,outlet at 45℃)is obtained.Furthermore,compared with pure R290,the CO_(2)/R290 working pair exhibits an enhancement of 75.2%in the optimal COP,with a corresponding increase of 107.7%in the volumetric heating capacity(q v).Similarly,the CO_(2)/R1234yf working pair demonstrates an improvement of 27.7%in the optimal COP and an increase of 92.0%in q v.The CO_(2)/R32 working pair exhibits a 15.0%increase in the optimal COP.However,the CO_(2)/R600a working pair exhibited only a 1.7%enhancement in the optimal COP,indicating a relatively low application potential.

关 键 词：热泵 余热回收 非共沸混合物 滑移温度 

分 类 号：TB612[一般工业技术—制冷工程] TB64TB657.5