The liquid dehumidifiers and regenerators are the key units for liquid desiccant cooling system(LDCS)and the ducts of liquid and air in the equipment are generally very complicated.Consequently

it is not easy to evaluate the internal heat and mass transfer of dehumidifier and regenerator.In this study

a simple falling film dehumidifier/regenerator was constructed and the dehumidification and regeneration experiments with countercurrent flow of liquid were carried out.The new Le-hD measurement method considering non-thermal equilibrium obtained previously was used to evaluate the coupled heat and mass transfer coefficients of plate falling film experiments under various experimental conditions.All these heat and mass transfer coefficients were rearranged in criterion equations to predict the performance of more intricate liquid dehumidifier/regenerator.