Theoretical And Experimental Study On Dehumidification Performance Of Liquid Desiccant System

With the improving of living level and the requirements of industry technology, the higher indoor air quality is required. The air-conditioning system not only needs to satisfy the heating load, but also the moisture load. At the same time, global energy demand is required more and more, and this situation become more serious every day. Overcooling and reheat process happened on the vapor compression refrigerator air system for dehumidify, this caused a plenty of high taste energy wastefulness. In recent years, Liquid Desiccant air system has received extensive attention and developed, for it is an installation which can use the tow taste heat quantity, achieve the independent temperature and humidity control, and improve indoor air quality. In the paper, the theoretical and experimental studies on the performance of liquid desiccant system were carried out.In the paper, the progresses of mass and heat transfer were analyzed thermodynamically. The mathematical model of liquid desiccant dehumidification was build and the effects of the inlet air parameter and inlet solution parameter on the parameter of outlet air parameter and solution was simulated. The experimental test facility of counter flow adiabatic packing dehumidifier was set up. Through orthogonal experiment design, dehumidification performance of liquid desiccant system was studied experimentally by changing the parameter of inlet liquid and inlet air. The optimal working condition of system was carried out based on a successful of experiments. The experimental results were compared with the numerical simulation results of which error was analyzed.Through analyzing of the simulation and experiment results, the conclusions are as follow:(1) Inlet solution temperature, inlet solution concentration and inlet liquid-air ratio effected significantly on dehumidify capacity. And inlet air temperatures effected weekly on dehumidify capacity.(2) When inlet liquid-air ratio was low, the higher inlet liquid-air ratio, and the higher dehumidify capacity. When inlet liquid-air ratio was increased to 1.5, dehumidify capacity did atruost not change by inlet liquid-air ratio. So the best inlet liquid-air ratio was 1.5.(3) Inlet solution temperature, inlet air moisture and inlet liquid-air ratio affected significantly on outlet air temperature. And inlet air temperatures effected weekly on dehumidify capacity.(4) Outlet solution temperature increased linearly and significantly by the increasing of inlet air flow and inlet solution temperature. Outlet solution temperature increased linearly by the increasing of inlet solution concentration.(5) Dehumidify capacity of this system was 4.4g/s, humid exchange efficiency was 72.1%, and enthalpy exchange efficiency was 51.5%. The dehumidification performance of this liquid desiccant system was verified.