Abstract: Based on the mechanical heat pump dehumidification principle, combined with the drying temperature requirements of washing machine, this paper designed a type of air circulations system under low temperature for the drying cycles in cloth dryers . A simulation model was established using EES software. This paper presented the thermodynamic performance and influencing factors of critical operating parametersusing theoretical simulation analysis. Results showed that the new system has significant thermal performance advantages compared to the conventional electric heating hot air drying system. The moisture extraction rate（MER） of designed system is 0.5018kW?h/kg decreased by 16.5%, which is a 16.5% decrease compared to the conventional drying system under the condition of 1.02 kg/h condensation rate. In addition, the drum operating temperature of designed system is 57.68 ℃, another significant decrease from 90 ℃ in the conventional system. Therefore, the designed system can effectively expand the drying range of clothes.

Key words: heat pump, low temperature drying, moisture extraction rate（MER）, energy conservation

摘要： 基于机械热泵除湿原理，同时结合洗衣机衣物烘干温度的要求，设计出一种衣物空气低温烘干循环系统。借助EES软件对该系统建立系统模型，通过理论模拟分析研究其热力学性能，并对影响其热力性能的关键操作参量影响进行分析。研究结果表明，在保证冷凝量均为1.02 kg/h的情况下，该设计系统的单位能耗除湿速率（moisture extraction rate，MER）为0.5018 kW?h/kg，较常规电加热热风烘干系统降低了16.5%；COP为0.79，较常规烘干系统提高了16.5%。此外，相比较常规电加热热风烘干系统方案烘干温度90 ℃，该方案设计的滚筒操作温度仅为57.68 ℃，有效地拓展了可烘干衣物的范围。

关键词: 热泵, 低温烘干, 除湿速率, 节能