This study aimed at clarifying the performance of air cycle refrigerator driven desiccant air conditioning system, and at designing high efficiency system. In this paper, numerical analyses of a desiccant rotor performance, which affects significant on this system performance, were performed. It was clarified that there was optimum angle of adsorption zone becoming maximum amount of moisture adsorption. And, the rotor outlet humidity depended on fraction of outdoor air intake and the air conditions. And also, the moisture adsorption efficiency was obtained considering the outdoor air conditions each hour in summer season. It was clarified that local maximum of the efficiency existed in day and night time respectively.
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