R32/R134a自复叠热泵变组分浓度实验分析  

Experimental study on concentration control of variable components in auto-cascade heat pumps using R32/R134a

作　　者：司成功 郭健翔[1,2,3] 孙晋飞 贺龙彬[1,2,3] 王俊鸿 刘占杰 SI Chenggong;GUO Jianxiang;SUN Jinfei;HE Longbin;WANG Junhong;LIU Zhanjie(School of Environment and Municipal Engineering,Qingdao University of Technology,Qingdao 266525,China;Key Laboratory of Waste Heat Utilization and Energy Saving Equipment in Shandong Province,Qingdao University of Technology,Qingdao 266525,China;Qingdao Key Laboratory of New Energy and Energy Saving Technology,Qingdao University of Technology,Qingdao 266525,China;Haier Biomedical Co.Ltd.,Qingdao 266000,China)

机构地区：[1]青岛理工大学环境与市政工程学院,山东青岛266525 [2]青岛理工大学山东省余热利用及节能装备技术重点实验室,山东青岛266525 [3]青岛理工大学青岛市新能源与节能技术重点实验室,山东青岛266525 [4]海尔生物医疗股份有限公司,山东青岛266000

出　　处：《高校化学工程学报》2024年第4期538-547,共10页Journal of Chemical Engineering of Chinese Universities

基　　金：国家重点研发计划(2020YFD1100302);山东省自然科学基金(ZR2020ME169);山东省重点研发计划(2022CXPT051);山东省重点研发计划软科学项目(2022RZB07055);山东省自然科学基金青年项目(ZR2022QB046)。

摘　　要：为缓解热泵大温度跨度运行时容积制热量衰减严重的问题,提出一种新型变组分浓度调控自复叠热泵实验装置,采用非共沸混合制冷剂R32/R134a为工作介质,通过动态监测系统组分浓度分布、制热量、性能系数(COP)等关键性能参数,探究混合工质浓度变化对自复叠热泵循环性能的影响规律。结果表明:冷凝器出水温度或第一级节流阀开度增加,主路低沸点组分质量分数降低2.5%~8.1%。而随着充注量增加,主路低沸点组分质量分数逐渐增加,排气温度逐渐降低;当充注量增至2.8 kg,出水温度为65℃时,COP达2.22,压缩机排气温度仅为80℃。当低沸点组分质量分数从0.3增加至0.5,排气温度最高可降低25.4%。与单级蒸气压缩系统(SVC)相比,自复叠热泵系统排气温度降低31.2%,以上自复叠热泵组分浓度分布及性能变化规律表明该热泵系统在大温度跨度时具有较明显的性能优势,对于系统长期稳定运行以及节能效应具有显著作用。To solve performance degradation problems of heat pumps under conditions of large operating temperature difference between source and supply waters,a novel auto-cascade heat pump was proposed and tested with a mixed refrigerant of R32 and R134a.The variation of component distribution was experimentally investigated to assess its effects on the system performance.The test results show that the low-boiling component R32 mass fraction dropped by 2.5%-8.1%with the increase of the condenser outlet water temperature and the first electrical expansion valve opening.Moreover,charging more mixed refrigerant could contribute to a lower system discharge temperature and increase the low-boiling component R32 mass fraction at the main cycle.When the system worked with 2.8 kg mixed refrigerant at the condenser outlet water temperature of 65℃,the system COP achieved~2.22,and the compressor discharge temperature can be controlled under 80℃.Meanwhile,the discharge temperature droped by up to 25.4%when increasing the low-boiling component R32 mass fraction from 0.3 to 0.5.Compared with the single-stage vapor compression system,the proposed auto-cascade system presents a perfect performance and lowers the discharge temperature by about 31.2%at the same working condition.This result indicates that the component distribution control of the mixed refrigerant could effectively improve the system performance and contribute to long-term stability and energy-saving.

关 键 词：自复叠热泵 非共沸工质 变组分浓度 实验研究 

分 类 号：TB657[一般工业技术—制冷工程]