利用冷凝热再生低浓度除湿溶液的实验研究

为了获得系统重要运行参数对利用冷凝热实现低浓度除湿溶液再生性能的影响,本文在热泵驱动溶液除湿空调系统实验平台上,以低浓度的Li Cl水溶液作为再生盐溶液,再生量和冷凝热利用率作为再生性能的评价指标,对利用冷凝热实现溶液再生过程进行了实验研究。结果表明:空气流量、温度和溶液流量、温度的增加都有利于提高再生量。在夏季典型工况下,当溶液浓度为21.20%~24.91%时,冷凝热利用率在0.416~0.507波动,降低溶液浓度有利于提高冷凝热利用率。并根据实验数据拟合出了利用冷凝热再生除湿溶液过程中的耦合传热传质系数关联式,为后续如何在溶液再生过程中充分利用冷凝热提供了实验依据。

Experimental Investigation for Low-concentration Liquid Desiccant Regeneration with Utilization of Condensation Heat

To investigate the heat and mass transfer effects on the regeneration process using condensation heat, experiments were performed in a hybrid air-conditioning system using low-concentration LiCl solution as the liquid desiccant. The regeneration rate and utilization ratio of condensation heat were regarded as evaluation criteria of regeneration performance. The effects of the important operating parameters on the system performance were analyzed experimentally. The results show that the air and solution mass flow rate and inlet temperature have a positive impact on the performance of regeneration. Under typical summer conditions, as the solution concentration increases from 21.20% to 24.91%, the utilization rate of condensation heat fluctuates between 0.416 and 0.507; the utilization rate of condensation heat would increase if the solution concentration was reduced. Finally, empirical correlations coupling the heat and mass transfer coefficients are presented. The experimental results provide reliable data for further analysis of using condensation heat efficiently for the solution regeneration process.