摘要
利用高温热泵回收工业余热具有巨大的节能潜力。高温热泵要求高临界温度,可选工质以干工质居多,但干工质从饱和气相开始压缩时,压缩过程在两相区,带来液击风险,不利于压缩机和高温热泵运行。提出了2种改进的补气增焓热泵循环(循环A和循环B),以Isohexane、R1336mzz(Z)和R1233zd(E)为工质,分析了压缩机等熵效率、蒸发温度和冷凝温度对最小过热度及热泵性能的影响。结果表明:对于循环B,蒸发温度自50℃升至80℃,对于R1336mzz(Z),COP最高可提高2.56%,VHC(单位容积制热量,volumetric heating capacity)最高可提高3.18%;对于R1233zd(E),COP最高可提高0.44%,VHC最高可以提高0.54%。循环A对等熵效率的适应性较好;对于循环B,当等熵效率超过0.6时,不宜采用Isohexane作为工质,而当等熵效率超过0.95时,R1336mzz(Z)也不宜采用。
The use of high-temperature heat pumps to recover industrial waste heat has a high potential for energy conservation.Hightemperature heat pumps require high critical temperatures,and the majority of the available working fluids are dry.However,when the dry working fluid is compressed from the saturated vapor phase,the compression process enters the two-phase region,resulting in a risk of liquid slugging that is detrimental to the operation of the compressor and high-temperature heat pump.Two improved vapor injection heat pump cycles(Cycle A and Cycle B)using isohexane,R1336mzz(Z),and R1233zd(E)as working fluids are proposed.The effects of compressor isentropic efficiency,evaporating temperature,and condensing temperature on the minimum superheating degree and heat pump performance are analyzed.The results indicate that,for cycle B,the evaporation temperature increases from 50℃to 80℃.For R1336mzz(Z),the maximum COP(coefficient of performance)can be increased by 2.56%,and the maximum volumetric heating capacity(VHC)can be increased by 3.18%.For R1233zd(E),the maximum COP can be increased by 0.44%,and the maximum VHC can be increased by 0.54%.Cycle A has good adaptability to the isentropic efficiency.For cycle B,when the isentropic efficiency is higher than 0.6,isohexane is not suitable as a working fluid.When the isentropic efficiency is higher than 0.95,R1336mzz(Z)is also not suitable.
作者
刘佳昕
陈健勇
陈颖
罗向龙
梁颖宗
何嘉诚
杨智
Liu Jiaxin;Chen Jianyong;Chen Ying;Luo Xianglong;Liang Yingzong;He Jiacheng;Yang Zhi(School of Material and Energy,Guangdong University of Technology,Guangzhou,510006,China;Guangdong Provincial Key Laboratory of Functional Soft Condensed Matter,Guangzhou,510006,China)
出处
《制冷学报》
CAS
CSCD
北大核心
2024年第6期41-49,共9页
Journal of Refrigeration
基金
广东省基础与应用基础研究基金自然科学基金(2022A1515012035)
高校教师特色创新研究项目(2021JNHB07)资助
关键词
高温热泵
干工质
补气增焓
最小过热度
high-temperature heat pump
dry working fluid
vapor injection
minimum superheating degree
