Abstract
A computationally simple model of a solid desiccant air-to-air enthalpy exchanger is developed. The theory of equilibrium exchange systems is used to establish the operating conditions under which enthalpy exchange between the two flow streams can be accomplished. To achieve maximum enthalpy exchange between the two air streams, the regenerator must be operated at conditions such that neither of the two transfer waves reaches the outlet of the enthalpy exchanger. Comparison with the numerical solution of the coupled equations for finite transfer coefficients shows that the product of two non-dimensional parameters, \\ ̄ gg, lΛ, must be greater than 1.5 in order to operate the enthalpy exchanger at a point where the enthalpy exchange effectiveness is determined only by the number of transfer units. The case of infinite rotation speed is used as a basis for developing a computationally simple measure of performance. The outlet states are computed using the ϵ- NTU correlations for counterfiow direct transfer heat exchangers. It is found that these correlations are accurate at operating conditions where enthalpy exchange occurs. The predicted outlet states lie, in the case of unity Lewis number, on a straight line connecting the outlet states.
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