一种新型空气源热泵除霜方式的实验研究  

Experiment on A Novel Defrost Cycle for Air Source Heat Pumps

作　　者：付文成[1] 郭宪民[1] 陶祥成[1] 

机构地区：[1]天津商业大学天津市制冷技术重点实验室,天津300134

出　　处：《制冷学报》2009年第3期16-20,24,共6页Journal of Refrigeration

基　　金：天津市应用基础研究计划(06YFJMJC05500)资助~~

摘　　要：提出了一种新型空气源热泵除霜方式,其基本原理是在热汽旁通除霜循环的基础上将室外换热器分为前后两排,中间用毛细管节流,前后排换热管在除霜过程中分别作为蒸发器和冷凝器,利用四通阀换向分别对其进行除霜。对新循环除霜性能进行了实验研究,并与逆循环除霜方式进行了比较。实验结果表明,新型分组节流除霜方式合理地利用了除霜能量,因此除霜时间及除霜损失小于传统逆循环除霜方式,而且在除霜过程中不从室内吸收热量,对其温度波动影响较小。在除霜过程中,新除霜方式的四通阀换向次数与逆循环除霜方式相同,但系统压力的波动幅度远远小于逆循环除霜方式,因此对系统的机械冲击要小得多。On the basis of the hot gas bypass defrost cycle, a new defrost method for air-source heat pumps was proposed. In the present defrost cycle, the outdoor heat exchanger is divided into two parts connected by a capillary tube. The front part and the rear part of the heat exchanger are used as an evaporator and a condenser respectively during the defrost process, and the defrost is completed by a four-way valve. The defrost performance of the new cycle was investigated experimentally and compared with that of a reverse-cycle defrost system. The experimental results indicate that the energy was used more efficiently, and thus the defrost time and the defrost loss of the new cycle were less than those of the reverse-cycle defrost system. Moreover, heat was not extracted from the indoor space during the defrost process. The switch time of the four-way valve in the new defrost system was the same to that of the reverse-cycle defrost system, and the fluctuation of the discharge and suction pressures during the defrost process was much less than that in the reverse-cycle defrost cycle.

关 键 词：热工学 新除霜方法 除霜特性 空气源热泵 

分 类 号：TB657.2[一般工业技术—制冷工程] TQ051.5[化学工程]