|
|
|
| Experimental Study on Characteristic of Thermal Energy Storage Defrosting for Air Source Heat Pump Using Sub-cooling Energy of Refrigerant |
| DONG Jian-Kai-1, JIANG Yi-Qiang-1, YAO Yang-1, YAN Ling-2 |
| (1.Institute of Heat Pump and Air Conditioning Technology, Harbin Institute of Technology, Harbin 150090, China； 2. Architectural Design&Research Institute, Southeast University, Nanjing 210096, China) |
|
|
|
|
Abstract This study is concerned with a thermal energy storage defrosting (TESD) based on reverse cycle defrosting method for air source heat pump (ASHP) using subcooling energy of refrigerant to eliminate frost on surface of outdoor coil. The feasibility of thermal energy storage using sub-cooling energy of refrigerant and defrosting were investigated experimentally. The defrosting performances were compared with a normal 850 W capacity ASHP system standard reverse cycle defrosting (SRCD) method. The results indicate that by the TESD for ASHP using sub-cooling energy of refrigerant method, the system coefficient of performance in heating can be improved due to the sub-cooling of refrigerant outlet of indoor coil, defrosting duration and reheating time can be shortened, and the indoor thermal comfort can be improved when defrosting and re-heating. During defrosting duration, TESD for ASHP using sub-cooling energy of refrigerant method improves discharge and suction pressures by 0.57 MPa and 0.11 MPa, respectively, also shortens defrosting duration and re-heating time by 30.8% and 25% in the tested environment, and reduces defrosting power consumption by 22.8kJ, relative to the SRCD method.
|
|
Received: 07 November 2011
Published: 30 October 2012
|
|
|
|
|
|
| No related articles found! |
|
|
|
|
