基于除湿换热器的热泵新风除湿系统实验研究

Experimental Study on Heat-pump Fresh-air Dehumidification System Based on Desiccant Coated Heat Exchanger

本文提出了基于除湿换热器的热泵新风除湿系统,将除湿换热器与热泵系统进行耦合,以水作为系统传热介质,实现了连续稳定的新风除湿。系统利用传统热泵的冷凝废热用于除湿换热器再生,利用蒸发器产生的冷水冷却除湿换热器,进而实现等温除湿。实验结果表明,与传统热泵新风除湿系统相比,采用除湿换热器的热泵新风系统的性能系数COPd提高了20%~50%。COPd提高程度随着再生温度的上升和循环温度差的增加,呈先增大后减小的趋势。当再生热水温度为50℃时,COPd提高最大值为45%。送风量与平均除湿量Dav呈反比,与COPd呈正比。当风量为291m^3/h时,平均除湿量Dav为5.76g/(kg干空气),COPd为2.06。

The heat-pump fresh-air dehumidification system based on desiccant coated heat exchanger (DCHE) is proposed. The DCHE is coupled with the heat pump system to achieve continuous and stable fresh-air dehumidification with the heat transfer medium of water. The conventional heat pump condensation heat in the system is used for the regeneration process in DCHE, and the evaporator cooling water for cooling the DCHE is used to achieve isothermal dehumidification. The experimental results show that compared with the traditional heat-pump fresh-air dehumidification system, the coefficient of performance (COP d ) of the heat-pump fresh-air system with the DCHE is increased by 20%-50%. The improvement of COP d is increased with the increase of regeneration temperature and cycle temperature difference, and such an increase gets up first and then down. When the temperature of the regenerated hot water is 50 °C, the COP d is increased by the maximum of 45%. The air supply volume is inversely proportional to the system average dehumidification amount D av , and is proportional to the COP d . When the air volume is 291 m ^3 /h, the average dehumidification amount D av is 5.76 g/(kg DA), and the COP d is 2.06, respectively.