Abstract
The internal cooling fluid is used to remove adsorption heat and improve dehumidification performance in desiccant coated heat exchangers (DCHEs), and its direction configuration not only has a significant impact on the heat and moisture transfer characteristics, but also sometimes determines the complexity of theoretical analysis. In this study, a simplified two-dimensional numerical model was developed to simulate the heat and moisture transfer within an air-cooling type FAM Z01 DCHE. The proposed model considers the local heat and moisture transfer mechanism and the effect of direction configuration of air flows. A parametric analysis is carried out for cross flow, counter current flow and cocurrent flow DCHEs. Results shows that the numerical model can receive a highly-reliable accuracy. The dehumidification performance indices of three DCHEs exhibit complex variation patterns under various parameters. The counter current flow DCHE demonstrates a better heat and moisture transfer performance compared to cross flow and cocurrent flow DCHEs. It can be found that the maximum relative deviation of dehumidification coefficient of performance DCOP between the cross flow DCHE and the other two DCHE is just 14.1%, indicating a feasible way for simplifying numerical modeling by transforming cross flow DCHE into counter current or cocurrent flow DCHE.
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