This experimental research deals with the determination of the mass transfer coefficient in the regeneration processo of a liquid dehumidifier (triethylene glycol), used in a solar air condittioning system. It is also developed, from na overall energy and massabalance, a model for calculating a parelal plate type regenerator using the same methodology as already accepted for designing colling towers. The model includes the lowering of the water vapor pressure in equilibrium with the aqueous glycol solution The heat and mass transfer analogy hás been used for obtaining na expression for the mass transfer coefficient from heat tranfer data, which is useful for designing solar regenerators from geometry, flow rates and temperature conditions. Finally, an uncertainty analysis of the Merkel, Le and Lep parameters has been carried on to validate the correlation developed from experimental data.