Exergetic efficiency for conversion of concentrational into thermal nonequilibrium

When there exists unsaturated moist air (at ρ0, T0, φ0) and water at the same temperature (ρ0, T0), the available concentrational nonequilibrium could be used for obtaining either work or better conditions for thermal cycles. Since obtaining work directly by using concentrational nonequilibrium of moisture (for example in machine with semipermeable pistons) is not technically feasible now, let us consider the process of conversion of concentrational into thermal nonequilibrium. In this paper the authors examine the exergetic efficiency of conversion for two cases that can often be met in usual technical practice: a. evaporation of water on the external surface by evaporative condensers, and b. cooling of air by spraying of water. The optimal parameters of the process and exergetic efficiency for given range of temperatures and relative humidity of surroundings air are calculated and presented in this paper