Comparative Study on Effectiveness and Condensation Rate in Parallel and Counterflow Dehumidifier in Air Dehumidification by Liquid Desiccant

Refrigiration systems and dehumidification by desiccant are a novel method for refrigeration and air conditioning. In this method moist of air removed, and then dehumided air send to cooling unit, consequently, latent load of vapor is eliminated, and rate of usage energy is decreased. The important part of this cycle is dehumidifier of it. In this paper, parallel flow dehumidifier is compared counter flow dehumidifier. In this work, at the first, the governing equations of coupled heat and mass transfer have been written, then, these equations have solved simultaneously. Results of this study shows that, effectiveness and condensation rate in counter flow dehumidifier is more than parallel flow dehumidifier. For thirteen studed cases in this paper, the maximum difference of effectiveness is 6.45%, and the maximum of condensation rate is 0.031 g/s. It should be said that, using solution in present study is lithum chlorid (LiCl).