基于多参数评估原则筛选高温热泵用三元非共沸混合工质  

Selection of ternary zeotropic mixtures for high-temperature heat pumps on multiparameter evaluation principles

作　　者：周昉 刘剑[1,2] 张小松 ZHOU Fang;LIU Jian;ZHANG Xiaosong(Department of Energy and Environment,Southeast University,Nanjing 210096,Jiangsu,China;Changzhou Research Institute of Southeast University,Changzhou 213164,Jiangsu,China)

机构地区：[1]东南大学能源与环境学院,江苏南京210096 [2]东南大学常州研究院,江苏常州213164

出　　处：《化工学报》2023年第11期4487-4500,共14页CIESC Journal

基　　金：国家自然科学基金项目(52206005);江苏省碳达峰与碳中和创新科学基金(BE2022606)。

摘　　要：高温热泵因其能将低温废热转化为高温热能,成为低温废热再利用的一项关键节能技术。其中,针对高温热泵的混合工质筛选问题是当前研究焦点之一。基于由低沸点工质CO_(2)和中高沸点工质HC类、HFO类组成的低GWP三元非共沸混合工质,提出了一种广泛适用的基于工作压力、温度滑移、可燃性和能效等关键因素的热泵用非共沸混合工质筛选方法,并对高温热泵系统进行了能效评估。结果表明,当混合工质CO_(2)/R600a/R1234ze(Z)的质量分数为0.1/0.1/0.8时,设定工况下的热泵系统最大热力性能系数(COP_(h))为4.31,对应的单位容积热容量(VHC)为2766 kJ/m^(3),[火用]效率(η_(ex))为0.50。High-temperature heat pumps have become a key energy-saving technology for low-temperature waste heat reuse because they can convert low-temperature waste heat into high-temperature thermal energy.To find a ternary zeotropic mixture suitable for the high-temperature heat pump,this paper proposes a comprehensive selected method that integrates considerations,including operating pressure,glide temperature,flammability,and energy efficiency.The results revealed that,with the optimal refrigerant selection,a ternary zeotropic mixture of CO_(2)/R600a/R1234ze(Z)with mass fraction of 0.1/0.1/0.8 is selected as the working medium for the high-temperature heat pump,resulting in a significant enhancement in performance.Under the specified conditions,the hightemperature heat pump system attains impressive performance metrics,including maximum coefficient of performance(COP_(h))of 4.31,volumetric heat capacity(VHC)of 2766 kJ/m^(3),and exergy efficiency(η_(ex))of 0.50.This study strongly advocates for the implementation of the high-temperature heat pump technology within the domain of low-grade industrial waste heat utilization.Through refrigerant selection,the high-temperature heat pump can effectively reclaim waste heat generated during industrial production processes,and making substantial contributions to the dual-carbon target.

关 键 词：非共沸混合工质 余热回收 高温热泵 温度滑移 热力学 

分 类 号：TB611[一般工业技术—制冷工程]