换热器结霜特性实验研究  

Experimental study on frosting characteristics of heat exchanger

作　　者：高阳阳 郭宪民[1] 谢福林 Gao Yangyang;Guo Xianmin;Xie Fulin(Tianjin Key Laboratory of Refrigeration Technology,Tianjin University of Commerce,Tianjin 300134,China)

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：《低温与超导》2022年第1期20-26,共7页Cryogenics and Superconductivity

基　　金：国家自然科学基金(51176142)资助。

摘　　要：对换热器表面霜层生长特性进行了实验研究,分析了换热器类型、翅片间距及环境温度、相对湿度对霜层厚度、换热量及空气侧压降的影响。实验结果表明,在一个结霜周期内,波纹片换热器的平均换热量最高,霜层生长速度及空气侧流动阻力介于开窗片和平片之间,因此,在空气源热泵(ASHP)中推荐选择波纹片换热器;换热器的翅片间距越小或环境空气相对湿度越大,则结霜周期内的平均换热量越大,但霜层生长速度及空气侧流动阻力越大,结霜周期越短,会造成传热恶化以及除霜损失增大等问题,使系统COP下降,在实际应用中应选择最优的翅片间距,特别是对高湿度工况。环境温度在0℃—3℃工况下霜层生长速度最快,换热器的结霜周期最短。The frost growth characteristics of the heat exchanger were experimentally studied, and the effects of the heat exchanger type, fin spacing, ambient temperature and relative humidity on grow of the frost thickness, heat transfer and air side pressure drop were analyzed. The experimental results indicate that in a frosting cycle the average heat transfer of the wavy fin heat exchanger is the highest, the growth rate of the frost thickness and its air side pressure drop is between the split fin and the flat fin. Therefore, the wavy fin heat exchanger is recommended for application in the air source heat pump(ASHP) system. The smaller fin spacing of the heat exchanger results in greater average heat transfer in a frosting cycle, as well as the higher ambient air relative humidity, but the growth rate of the frost thickness and the air side pressure drop are greater, which causes the shortening of the frosting cycle and the deterioration of the heat transfer, so as to the increase of the defrosting loss and reduce the COP of the system. In practical application, the optimal fin pitch should be selected, especially for the high humidity conditions. The experimental results show that the frost layer grows fastest and the frosting cycle of heat exchanger is the shortest when the ambient temperature is 0 ℃-3 ℃.

关 键 词：热泵 结霜工况 翅片类型 翅片间距 

分 类 号：TK172[动力工程及工程热物理—热能工程]