大中型空气源热泵多台室外机并联轮换过冷除霜系统研究  

Research on Parallel Sub-cooling Defrosting System with Multi Outdoor Units of Large or Medium Air Source Heat Pump

作　　者：牛建会[1] 步秋军 NIU Jianhui;BU Qiujun(Department of Energy Engineering,Hebei University of Architecture,Zhangjiakou O75000,Hebei,China)

机构地区：[1]河北建筑工程学院能源工程系,河北张家口075000

出　　处：《建筑科学》2022年第8期172-176,共5页Building Science

基　　金：2020年度河北省教育厅青年基金项目“多台压缩机并联大型空气源热泵系统容量调节及除霜方式研究”(QN2020405);2021年河北省级研究生示范课“冷热源工程”建设项目(KCJSX2021084);2021年度河北建筑工程学院研究生创新基金项目“空气源热泵轮换过冷除霜方式研究”(XY202141);。

摘　　要：结霜是降低空气源热泵冬季制热能力的主要因素之一,解决的主要技术路线是抑霜和高效除霜。针对大、中型空气源热泵除霜问题,提出一种多台室外机并联轮换过冷除霜的新型循环型式,并对该循环型式进行热力学分析与实验研究,结果表明:当采用4台室外机轮换过冷除霜时性能达到最优;除霜过程中待过冷量下降至0.25 kW时除霜结束;除霜过程中的最小制热量仍能达到机组无霜时制热量的64%以上;当室外空气温度为-10℃,轮换过冷除霜的能效比仍能达到2.18。Frosting is one of the main factors hindering the heating capacity of air source heat pump in winter.The main technical solution for the problem is delaying frost and efficient defrosting.In response to the defrosting problem of large or medium air source heat pump,a new type of defrosting cycle with multi outdoor units in parallel was proposed,and the thermodynamic analysis and experimental study were further conducted.The results show that the heating performance would reach the optimal when four outdoor units were used for sub-cooling defrosting.The defrosting is finished when the sub-cooling capacity reduced to 0.25 kW.The minimum heating capacity in the defrosting process can still reach more than 64%of that without frost.When the outdoor air temperature was-10℃,the energy efficiency ratio of alternate sub-cooling defrosting can still reach 2.18.

关 键 词：空气源热泵 抑霜 除霜方法 过冷除霜 制热性能 能效比 

分 类 号：TB612[一般工业技术—制冷工程] TB657