新型高温热泵混合工质替代R245fa的性能研究  

Study on the Performance of New High Temperature Heat Pump Mixtures as Alternatives to R245fa

作　　者：冯彪 张昭 简琳睿 赵贯甲 马素霞 FENG Biao;ZHANG Zhao;JIAN Linrui;ZHAO Guanjia;MA Suxia(Shanxi Key Laboratory of Clean and High Efficient Combustion and Utilization of Circulating Fluidized Bed,College of Electrical and Power Engineering,Taiyuan University of Technology,Taiyuan 030024,China)

机构地区：[1]太原理工大学电气与动力工程学院,循环流化床高效清洁燃烧与利用山西省重点实验室,太原030024

出　　处：《太原理工大学学报》2023年第5期941-949,共9页Journal of Taiyuan University of Technology

基　　金：国家自然科学基金青年基金项目(52106024);山西省基础研究计划青年科学研究项目(20210302124447);中国博士后基金资助项目(2022M722343)。

摘　　要：【目的】目前能源供需矛盾日益加剧,高温热泵作为一种节能减排技术,可以将大量低品位余热提升为高品位能量加以利用。合适的工质对系统性能的提升至关重要。【方法】提出了5种环保热泵工质:R1233zd(E)/R1234ze(Z)(0.15:0.85),R600a/R1233zd(E)(0.70:0.30),R600a/R1233zd(E)/R600(0.01:0.15:0.84),R600a/R1233zd(E)/环氧乙烷(0.34:0.01:0.65)和R1233zd(E)/R1234ze(Z)/R245ca/R600a(0.39:0.58:0.01:0.02).比较了新工质与现有工质R245fa在基础热物性、循环性能和安全性等方面的性能。【结果】对于基础热物性,所提出的5种替代工质在黏度、比定压热容、导热系数和冷凝热等参数方面均优于R245fa,且环保性能突出;对于循环性能,在冷凝温度110℃工况下,替代工质性能系数(COP)与R245fa接近,单位容积制热量分别是R245fa的111%,144%,125%,144%和108%;用基团贡献法对新工质的可燃性进行预测,结果表明,R1233zd(E)/R1234ze(Z)(0.15:0.85)、R600a/R1233zd(E)(0.70:0.30)和R1233zd(E)/R1234ze(E)/R245ca/R600a(0.39:0.58:0.01:0.02)预估为不可燃混合物。【结论】5种工质都具有替代R245fa的潜力,推荐选择R1233zd(E)/R1234ze(Z)(0.15:0.85),其综合性能良好。【Purposes】At present,the contradiction between energy supply and demand is increasingly intensifying,and high-temperature heat pumps,as an energy-saving and emission-reduction technology,can upgrade a large amount of low-grade waste heat to high-grade energy for utilization.【Methods】Five environmentally friendly heat pump working fluids are proposed,R1233zd(E)/R1234ze(Z)(0.15:0.85),R600a/R1233zd(E)(0.70:0.30),R600a/R1233zd(E)/R600(0.01:0.15:0.84),R600a/R1233zd(E)/ethylene oxide(0.34:0.01:0.65),and R1233zd(E)/R1234ze(Z)/R245ca/R600a(0.39:0.58:0.01:0.02).The performance of the new working fluid and the existing working fluid R245fa is compared in terms of basic thermophsical proper-ties,cycle performance,and safety.【Findings】The results show that the five alternative work-ing fluids proposed are superior to R245fa in terms of viscosity,constant pressure specific heat,thermal conductivity,and condensation heat,and have outstanding environmental performance.For the cycle performance,under the condition of condensing temperature of 110℃,the alterna-tive working fluid COP is close to R245fa,and the unit volume of heat production is 111%,144%,125%,144%,and 108%of R245fa,respectively.The group contribution method is used to predict the flammability of the new working fluid,and the results show that R1233zd(E)/R1234ze(Z)(0.15:0.85),R600a/R1233zd(E)(0.70:0.30),and R1233zd(E)/R1234ze(E)/R245ca/R600a(0.39:0.58:0.01:0.02)are estimated to be non-flammable mixtures.【Conclu-sions】All the five working fluids have the potential to replace R245fa,and R1233zd(E)/R1234ze(Z)(0.15:0.85)is the most recommended,which has good comprehensive performance.

关 键 词：热泵 工质 循环性能 可燃性 全球变暖潜能 

分 类 号：TK11[动力工程及工程热物理—热能工程]