空气源热泵多台室外机并联轮换除霜实验研究  

Experimental Study on Air-Source Heat Pump Alternate Defrosting with Multiple Outdoor Units in Parallel

作　　者：牛建会[1] 梁征 刘福生 马国远[2] 冯连元 Niu Jianhui;Liang Zheng;Liu Fusheng;Ma Guoyuan;Feng Lianyuan(Hebei Renewable Energy Heating Engineering Technology Center,Hebei University of Architecture,Zhangjiakou,075000,China;Department of Environment and Life,Beijing University of Technology,Beijing,100124,China;Hebei Technology Innovation Center of Phase Change Thermal Management of Data Center,Hebei University of Water Resources and Electric Engineering,Cangzhou,061001,China)

机构地区：[1]河北建筑工程学院河北省可再生能源供热工程技术中心,张家口075000 [2]北京工业大学环境与生命学部,北京100124 [3]河北水利电力学院河北省数据中心相变热管理技术创新中心,沧州061001

出　　处：《制冷学报》2024年第6期158-166,共9页Journal of Refrigeration

基　　金：河北省高等学校科学技术研究项目(ZD2022116);河北省硕士在读研究生创新能力培养资助项目(CXZZSS2023161);河北省数据中心相变热管理技术创新中心开放项目(SKF-2022-08)资助。

摘　　要：设计并搭建了多台室外机并联空气源热泵实验系统,采用热液过冷对室外机进行轮换除霜。实验研究在不同室外温、湿度条件下系统制热性能随结、除霜的变化特点,并与热气旁通轮换除霜对比。结果表明:热液过冷轮换除霜效果良好,当室外侧空气温度为-10℃、相对湿度为90%时,最佳开始除霜时间为30 min,系统制热量由无霜时的9.87 kW降至开始除霜时的8.71 kW,制热COP由无霜时的3.73降至开始除霜时的3.36。不同湿度工况下运行除霜时,系统制热量及制热COP最小值可达5.42 kW、2.28。与旁通20%热气除霜相比,热液过冷轮换除霜平均制热量提升13.8%、制热COPC提升10.1%。An experimental system of an air-source heat pump with multiple outdoor units in parallel was designed and built.The outdoor units were defrosted in turn using hot subcooled liquid for defrosting.The heat pump heating performance variations in the course of frosting and defrosting under different outdoor temperature and humidity conditions were experimentally studied,and the heating performances of the hot liquid subcooling alternate defrosting system and hot gas bypass alternate defrosting system were compared and analyzed.The experimental results show that the hot liquid subcooling alternate defrosting can enable the heat pump to complete the defrosting under the condition of continuous heating and that the defrosting performance is good.When the outdoor air temperature is-10℃and the relative humidity is 90%,the optimal time to start defrosting is 30 min.At this time,the system heating capacity decreases from 9.87 kW when there is no frost to 8.71 kW when the defrosting starts,and the heating COP decreases from 3.73 to 3.36.When the system operates defrosting under different humidity conditions,the minimum values of system heating capacity and heating COP can reach 5.42 kW and 2.28,respectively.Compared to the case of bypassing 20%of discharge gas for defrosting,the average heating capacity of hot liquid subcooling alternate defrosting is 13.8%higher,and the heating COPC is 10.1%higher.

关 键 词：空气源热泵 热液除霜 热气除霜 制热性能 

分 类 号：TB612[一般工业技术—制冷工程] TB657.5