两级双溶液除湿系统性能研究

Performance Study of Two-stage Liquid Desiccant Dehumidification System

建立了两级双溶液除湿系统,其核心部件是采用氯化钙溶液预处理空气的第1级除湿器和采用氯化锂溶液的第2级除湿器,并利用数学模型对其除湿效果进行计算.结果表明:与采用氯化钙和氯化锂混合溶液(CELD,氯化钙与氯化锂质量比1∶1)的系统相比,双溶液除湿系统的除湿效果更佳且能量利用率更高;在温度30°C、绝对湿度16.2 g/kg的工况下,双溶液除湿系统能够使空气的绝对湿度降至7.93 g/kg,系统的热力性能系数(COP)达到1.08;若采用太阳能驱动系统,当集热器出口的热水温度为87°C时,该系统性能最佳,COP值达到1.08;当热水温度为75°C时,基于太阳辐射的COP最高,其值为0.51.

A novel two-stage liquid desiccant dehumidification system using CaC12 and LiCl solution separately was studied for increasing dehumidification performance and lowering desiccant solution investment. Process air is pre-dehumidified by CaCl2 in the first stage dehumidifier, and further dehumidified in the second stage dehumidifier by LiCl. At the ambient condition of 30 ℃, 16.2 g/kg, the thermal COP is 1.08 and 0.51 based on regeneration heat and solar incidence respectively. The performance of the proposed system was also compared with the dehumidification system using cost effective liquid desiccant （CELD） proposed by Ertas.