液体除湿空调再生传质特性的实验研究

Experimental Study on Mass Transfer Performance of Liquid Desiccant Regeneration in Air-conditioning System

分析了液体除湿空调再生过程热质交换的耦合特性,并提出了提高再生过程热质交换性能的措施,在此基础建立了液体除湿空调系统,其中再生器采用逆流式填料塔,在填料塔设置中间加热器,利用排风进行再生。使用氯化锂作为除湿剂,实验分析了影响再生传质性能的主要因素以及提高再生性能措施的有效性,结果表明:再生溶液温度、流量以及空气流量对再生传质量的影响比较显著,为了保证一定的再生量,溶液温度一般不低于60℃;采用室内排风再生和再热器再热均增强了再生过程传质势,提高了再生量。

The coupling of heat and mass transfer of liquid desiccant regeneration in an air conditioning system was analyzed and the measures to increase the performance of regeneration were proposed. Then a liquid desiccant air-conditioning system was established which uses a counterflow packed tower as the regenerator with a heater in it and exhaust for regeneration. Lithium chloride was adopted to be the desiccant. The main factors affecting mass transfer and effectiveness of measures applied to improve the performance of regeneration were analyzed by experiments. The results show that the solution temperature and flow rate, and the air flow rate have significant influence on the mass transfer of regeneration. The solution temperature should be higher than 60 ℃ to ensure effective regeneration. In addition, mass transfer can be enhanced by the use of exhaust and the reheater.