期刊
APPLIED THERMAL ENGINEERING
卷 67, 期 1-2, 页码 131-136出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.applthermaleng.2014.03.011
关键词
Finned-tube heat exchanger; Frosting factor; Low outdoor temperature; Cascade type air-source heat pump
资金
- National Natural Science Foundation of China [51208298]
- Science Innovation Project of Shanghai Municipal Education Commission [13YZ070]
- Leading Academic Discipline Project of Shanghai Municipal Education Commission [J50502]
- [ZZslg12020]
Most studies on frosting characteristics were conducted between -6 and 6 degrees C, which is the most common heat pump operation temperature region under frosting condition. But the cascade heat pump can operate at the temperature as low as -20 degrees C, thus, the frosting characteristics of low temperature environment should be studied. The frosting experiments are carried out in a climate chamber on a cascade type air-source heat pump. The outdoor temperature in the study varies from -18 degrees C to 6 degrees C and outdoor relative humidity varies from 70% to 90%. From the experimental results, it is found that the amount of frosting almost changes linearly with the frosting time, and the outdoor relative humidity has a great influence of the quantity. At low temperature conditions, frost still exists with lower the frosting rate. A new index called frosting factor is brought forth, which considers the moisture content difference as the frosting potential. Finally, it is found that the frosting factor is from 0.0389 to 0.05 g m(-2) s(-1) (g/kg)(-1) and the average value is 0.0446 g m(-2) s(-1) (g/kg)(-1), which can be utilized to estimate the frosting quantity under different outdoor environment conditions. (C) 2014 Elsevier Ltd. All rights reserved.
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