Experimental Investigations of a Liquid Desiccant Absorber

摘要

A cross-flow internally-cooled plate-type heat and mass exchanger is developed and examined experimentally as a dehumidifier in a liquid desiccant System. The sorbent used is lithium Chloride (LiCI). The dehumidifier utilizes novel components and ideas in order to overcome the present obstacles such as the carryover of the sorbent into the air stream and the flow mal distribution of the sorbent over the exposed surfaces. The moisture removal rate was evaluated. The effects of the dehumidifier inlet parameters, including desiccant and water flow rates, air inlet temperature and humidity ratio were investigated. The air outlet temperature and humidity ratio were studied as a function of cooling water flow rate. The experimental results of the supply air adiabatic dehumidification show a consistent reduction in the air humidity ratio Δω> in the range of 1.5 to 4.8 g/kg, an increase in the air temperature ΔT in the range of 3 to 7 K and a reduction in the LiCI Solution mass fraction Δζ in the range of 0.01 to 0.05 kg/kg. The experimental results of non-adiabatic dehumidification with internal cooling show a reduction in the air humidity ratio Δω of about 6 g/kg, a decrease in the air temperature AT in the range of 0.5 to 3.5 K and a reduction in the LiCI Solution mass fraction Δω of about 0.06 kg/kg.