A New Air-conditioning System of Liquid Desiccant and Evaporation Cooling

This paper describes the design of a liquid desiccant air conditioning system using low-grade heat resource, which employs environmental-friendly, ozone-safe working substance - LiCl solution as the desiccant and is able to treat the ambient air at a high temperature 35 degrees C to the air conditioning supply air at a low temperature 18 degrees C. It can handle both latent and sensible heat load of the room without any other refrigeration method. The paper analyzes the complicated heat and mass transfer process of individual components theoretically and establishes a numerical simulation for the whole system. Based on that, a liquid desiccant air conditioning device which can offer 40kw cooling capacity is worked out and built up. The Coefficient of the Performance (COP) of the device can be up to 0.8 when the heat source temperature is about 70 degrees C. The experimental data well consist with the numerical computation results.