Study of the dynamic characteristics of liquid desiccant dehumidification processes.

This paper develops a liquid desiccant dehumidification experimental facility. Tests on the dynamic characteristics of the dehumidification process are conducted on the counter-flow structured packing dehumidifier. The time constant of the dynamic response is defined to characterize the dynamic processes. Experiments with different inlet conditions show that time constants of the outlet air humidity ratio and temperature are not always equal. The transient time can be up to 250 seconds before the outlet variables of air achieve steady state. The dynamic responses of the outlet humidity ratio and temperature to the step changes of the mass flow rate of solution are also tested. The experimental results and analysis can be used for modeling validation of liquid desiccant dehumidification processes.

本文搭建了一套液体干燥剂除湿（liquid desiccant dehumidification）实验装置。针对逆流式规整填料除湿器，开展了除湿过程动态特性的实验测试。本研究定义动态响应时间常数以表征该动态过程。不同进口工况下的实验结果表明，出口空气含湿量与出口空气温度的时间常数并非始终相等。空气出口参数达到稳态前的过渡时长可达250秒。本文还测试了出口含湿量与出口空气温度对溶液质量流量阶跃变化的动态响应特性。本实验的结果与分析可用于液体干燥剂除湿过程的建模验证。