EFFECTS OF AIRFLOW MALDISTRIBUTION ON THE PERFORMANCE OF AN AIR-TO-WATER HEAT PUMP UNDER FROSTING CONDITIONS
The effects of airflow maldistribution on the performance of an air-to-water heat pump system under frosting conditions were investigated experimentally. Different airflow distributions were experimented on a 50 KW unitary air-to-water heat pump. The results indicated that the airflow maldistribution was the dominant factor leading to the hunting of the thermostatic expansion valve for medium and/or large size finned tube evaporators. In stable stage, with airflow maldistribution degree (AMD) increasing, frosting was quickened and the system stable working time was shortened. The refrigeration system operating characteristics were lowered accordingly. We found the phenomenon seemed to be related to both the difference of refrigerant outlet temperature superheat and the frosting velocity. In hunting stage, with AMD increasing, the heat pump system pertinent performance data (suction pressure, evaporation temperature, discharge pressure, refrigerant outlet temperature, etc) were degraded more dramatically.
air-source heat pump frosting airflow maldistribution
JianYing GONG X.L.YUAN W.Y.HU D.HUANG
Refrigeration and Cryogenic School, Xi’an Jiaotong University,Xi’an, 710049, China Chinese Association of Refrigeration, 10/F., Yindu Mansion , No. 67 Fucheng Road ,Beijing, 100036, C
国际会议
The 22nd International Congress of Refrigeration(第22届国际制冷大会)
北京
英文
2007-08-21（万方平台首次上网日期，不代表论文的发表时间）