中文摘要：

空气源热泵在冬季结霜会对机组的运行产生较大影响。本文实验机组为一台复叠式空气源热泵，室外侧换热器采用带亲水膜的翅片，在焓差实验室中进行室外温度在～18℃～6℃区间、相对湿度在70％～90％区间内的实验，研究空气源热泵的翅片管换热器的结霜量。实验结果显示：结霜量随时间增加而增加，并且接近线性关系；室外温度在-3℃～3℃时的结霜量最高，随着室外温度的下降，结霜量下降；室外湿度对结霜量的影响较大，在70％的相对湿度下，结霜量远小于80％～90％的结霜量；本文根据结霜时间、换热面积和盘管表面温度与空气露点温度与结霜量之间的关系，提出了结霜因子的概念，并得到结霜因子的范围为1．69～2．67×10^2ks／（m2·℃·h），其平均值为2．22×10-3kg／（In^2·℃·h）。

英文摘要：

The frost on the heat exchanger of air-source heat pump has a great influence on the operating performance. The frosting exper iment based on a cascade type air-source heat pump water heater is carried out in the enthalpy-difference chamber in this paper, and the outdoor evaporator of the unit is a finned-tube heat exchanger. The experiment is conducted under the conditions that the outdoor tempera- ture is from - 18℃ to 6℃ and outdoor relative humidity is from 70% to 90%. Experimental results show tllat： first of all, the amount of frosting almost changes linearly with the frosting time which is of maximum in the outdoor temperature range of - 3℃ - 3℃ , and the lower outdoor temperature, the more frosting amount ; secondly, the outdoor relative humidity has a great influence on the quantity of frost, and the more humidity, the more frosting quantity; finally, the frosting factor is proposed based on the relationships of the area and form of e- vaporator coil, the time of frosting, the difference of the dew point temperature and the temperature on the evaporator coil and the frosting quantity, and is from 1.69-2.67 x10-3kg/（m2 . ℃ . h） with the average value 2.22 x 10-3kg/（m. h）.