非共沸混合工质应用于复叠式高温热泵系统低温回路的试验研究  

Experimental study on application of non-azeotropic mixed working fluids in low temperature circuit of cascade high temperature heat pump system

作　　者：胡晓微[1] 张蓓 董胜明 HU Xiao-wei;ZHANG Bei;DONG Sheng-ming

机构地区：[1]天津商业大学,天津300134

出　　处：《节能》2022年第2期39-43,共5页Energy Conservation

基　　金：天津市自然科学基金(项目编号:18JCYBJC90500);天津市技术创新引导专项基金(项目编号:20YDTPJC01150)。

摘　　要：为研究不同滑移温度的混合工质应用于复叠式热泵系统低温回路对热泵机组性能的影响,搭建复叠式高温热泵实验台,选用R245fa与R134a/R245fa(质量比分别为9∶1、8∶2、7∶3、6∶4)作为高温、低温级循环工质,蒸发器进水温度在20~40℃,冷凝器出水温度在110~130℃的情况下进行试验,并对机组的COP、制热量、吸热量、压缩机排气压力等性能参数进行分析。结果表明,在制取120℃的热水时,低温级工质选用R134a/R245fa(8∶2)具有显著优势;在循环温升为90℃时,系统在低温水源温度为30℃、制取热水温度120℃工况下综合性能较好,且当低温级工质为R134a/R245fa(8∶2)时,系统综合性能最优,COP为2.52。试验结果可为复叠式高温热泵机组工质的选择提供参考。In order to study the effect of mixed working fluids with different glide temperature on the performance of the heat pump unit after being applied to the low-temperature circuit of the cascade heat pump system,a cascade high-temperature heat pump test bench was built.R245fa and R134a/R245fa with different ratios were selected(mass ratio is 9∶1,8∶2,7∶3,6∶4 respectively)are selected as a high temperature and low temperature working fluids,the evaporator inlet temperature was 20~40℃,and the condenser outlet temperature was 110~130℃.The COP,heating capacity,heat absorption capacity,compressor discharge pressure and other performance parameters of the unit are analyzed.The experimental results show that when making 120℃hot water,the low temperature working fluid selection R134a/R245fa(8∶2)has significant advantages.When the circulating temperature rise is 90℃,the system has better overall performance under the working condition of low temperature water source temperature of 30℃and hot water temperature of 120℃.When the low temperature working fluid is R134a/R245fa(8∶2),the system is the best overall performance,and the COP is 2.52.The experimental results can provide reference for the selection of working fluids of cascade high-temperature heat pump units.

关 键 词：非共沸工质 复叠式高温热泵 循环性能 余热回收 

分 类 号：TK115[动力工程及工程热物理—热能工程]