A novel defrosting control method based on the degree of refrigerant superheat for air source heat pumps

作     者：Jiang, Yiqiang Dong, Jiankai Qu, Minglu Deng, Shiming Yao, Yang 

作者机构：Harbin Inst Technol Sch Municipal & Environm Engn Harbin 150006 Peoples R China Hong Kong Polytech Univ Dept Bldg Serv Engn Kowloon Hong Kong Peoples R China 

出 版 物：《INTERNATIONAL JOURNAL OF REFRIGERATION-REVUE INTERNATIONALE DU FROID》 (Int J Refrig)

年 卷 期：2013年第36卷第8期

页      面：2278-2288页

核心收录：

学科分类：080705[工学-制冷及低温工程] 08[工学] 0807[工学-动力工程及工程热物理] 0802[工学-机械工程] 

基　　金：Chinese National "Twelfth Five-Year" Plan of Science and Technology [2012BAJ06B02] Hong Kong Polytechnic University [1-ZV6P] 

主　　题：Defrosting control method Refrigerant Superheat Heat pump Air-source Experiment 

摘      要：When an air source heat pump (ASHP) unit operates for space heating at a frosting environment, periodic defrosting is necessary to maintain a high system performance. To defrost efficiently, it is necessary to find an effective defrosting control method. In this paper, an experiment was carried out on an ASHP unit with a capillary tube as a throttle device, under simulated frosting and defrosting conditions using time control defrosting method, and the experimental results are firstly presented. Secondly, a novel defrosting control method based on the degree of refrigerant superheat (DS) is reported. To validate the novel defrosting control method, a further experiment was conducted on another ASHP unit with an electronic expansion valve (EEV) as a throttle device, under simulated frosting and defrosting conditions. The experimental results demonstrated that when applying the novel defrosting control method, defrosting was initiated before the operating performances of ASHP unit rapidly deteriorated, which was more reasonable. (C) 2013 Elsevier Ltd and IIR. All rights reserved.