Operating performance of novel reverse-cycle defrosting method based on thermal energy storage for air source heat pump  

作　　者：董建锴 姜益强 姚杨 张雪丹 

机构地区：[1]Institute of Heat Pump and Air Conditioning of Technology, Harbin Institute of Technology

出　　处：《Journal of Central South University》2011年第6期2163-2169,共7页中南大学学报（英文版）

基　　金：Project(50606007) supported by the National Natural Science Foundation of China

摘　　要：To solve the fundamental problem of insufficient heat available during defrosting while ensuring the efficient and safe system operation for air-source heat pumps (ASHPs). A novel reverse-cycle defrosting (NRCD) method based on thermal energy storage to eliminate frost off the outdoor coil surface was developed. Comparative experiments using both the stand reverse cycle defrosting (SRCD) method and the NRCD method were carried out on an experimental ASHP unit with a nominal 2.5 kW heating capacity. The results indicate that during defrosting operation, using the NRCD method improves discharge and suction pressures by 0.24 MPa and 0.19 MPa, respectively, shortens defrosting duration by 60%, and reduces the defrosting energy consumption by 48.1% in the experimental environment, compared with those by the use of SRCD method. Therefore, using the NRCD method can shorten the defrosting duration, improve the indoor thermal comfort, and reduce the defrosting energy consumption in defrosting.To solve the fundamental problem of insufficient heat available during defrosting while ensuring the efficient and safe system operation for air-source heat pumps （ASHPs）. A novel reverse-cycle defrosting （NRCD） method based on thermal energy storage to eliminate frost off the outdoor coil surface was developed. Comparative experiments using both the stand reverse cycle defrosting （SRCD） method and the NRCD method were carried out on an experimental ASHP unit with a nominal 2.5 kW heating capacity. The results indicate that during defrosting operation, using the NRCD method improves discharge and suction pressures by 0.24 MPa and 0.19 MPa, respectively, shortens defrosting duration by 60%, and reduces the defrosting energy consumption by 48.1% in the experimental environment, compared with those by the use of SRCD method. Therefore, using the NRCD method can shorten the defrosting duration, improve the indoor thermal comfort, and reduce the defrosting energy consumption in defrosting.

关 键 词：air source heat pump thermal energy storage phase change material reverse-cycle defrosting 

分 类 号：TU831[建筑科学—供热、供燃气、通风及空调工程]