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王志毅1，陈松2，杨创辉2

(1. 浙江理工大学建筑工程学院，杭州310018； 2. 浙江盾安人工环境设备股份有限公司，诸暨311835)

制冷学报 .-2008，29（4）.－34～37 

    摘 要：采用四通换向阀换向逆循环除霜，风冷热泵机组系统压力波动剧烈而产生比较大的机械冲击，频繁启动压缩机，影响室内的舒适性与压缩机的寿命，针对逆循环除霜的缺陷，提出了交叉除霜循环的原理和过程.交叉除霜对需要除霜的一组空气侧换热器通过切换对应的四通换向阀进行空气侧换热器分组除霜，在制冷量为359 kW的风冷螺杆热泵冷热水机组上进行了空气侧换热器交叉除霜的实验研究.测试结果表明：机组的排气温度在合理的温度范围内，吸气压力略有升高，不易产生低压保护，空调房间可以送出热风.交叉除霜制热时间延长，提高了机组运行的经济性，除霜时间缩短，提高了机组综合能效比，可以应用于多组空气侧换热器的风冷热泵机组的除霜设计。

    关键词：工程热物理；实验；交叉除霜；风冷热泵冷热水机组

Cross defrosting on air side heat exchanger of air to water heat pump
WANG Zhi-yi, CHEN S, YANG C H
School of Civil Engineering and Architecture, Zhejiang Sci-Tech University, Hangzhou 310018, China

Abstract The cross defrosting cycle was presented in which one air side heat exchanger defrosts by switching over the corresponding four-way valve and the others operate normally. The experiment of the air side heat exchanger cross defrosting was conducted on an air to water heat pump using a screw compressor with a refrigerating capacity of 359kW. The results show that the discharge temperature of the unit was at a normal range and the suction pressure rose slightly. Moreover, the heating time was longer and the comprehensive EER improved greatly.

Keywords Engineering thermophysics; Test; Cross defrosting; Air to water heat pump