Abstract:

A mathematical model for exergy analysis has been built to investigate the performance of liquid desiccant dehumidification and cooling system based on LiCl solution.Efforts are focused on exergy loss in each component, as well as the influence of desiccant solution and air inlet parameters on dehumidifier (demonstrated by exergy efficiency of dehumidifier).It was found that: (1) air velocity and humidity have dominanted influence on dehumidifier performance; (2) in the liquid desiccant dehumidification and cooling system, the biggest part of exergy loss happens in solution-hot water heat exchanger, 24.5%, followed by solution-solution recuperator and cooling water-solution heat exchanger, which accounts for 24.4% and 22.8% respectively.Reducing exergy loss in heat exchanger is the key way to improve the system exergy efficiency.

摘要：

基于热力学第二定律建立了针对溶液除湿系统的火用分析模型，重点分析了空气和溶液进口参数对溶液除湿器性能（除湿器火用效率）的影响，并且对采用LiCl的溶液除湿冷却系统进行了部件分析。结果表明：（1）除湿器的火用效率影响因素中，空气速度和空气湿度影响最大，其次是溶液的温度和浓度，而空气进口温度和溶液流速的影响基本可以忽略;（2）在整个系统中，溶液-热水换热器的火用损失最大，占24.5%，其次是溶液-溶液热回收器和冷水-溶液换热器，分别占24.4%和22.8%，可见减小换热器的火用损是提高系统火用效率的关键。此研究对于明确改进溶液除湿空调的方向有重要意义。