Outline of batch type desiccant airconditioning system and humidificationheating performance study on development of residential desiccant airconditioning system and its performance evaluation (part 1)

In order to improve the indoor air quality (IAQ) problem caused by microbes such as mold and mites, and the decrepitude of buildings, desiccant air-conditioning systems have been adopted in buildings. However, conventional desiccant air-conditioning systems aremainly adopted for large-scale buildings, such as offices and hotels. They have rotors for desiccant and sensible heat exchange and therefore require a rather large machine room for air-conditioning. However, detached houses rarely have enough spaces for air-conditioning systems. In addition, little research in passive methods utilizing a desiccant or natural ventilation has been reported. Sometimes passive methods are affected by outdoor conditions and are not feasible for stable correspondence to indoor loads. In this paper, a batch-type desiccant air-conditioning system placed in the floor cavity was proposed which is able to operate perennially in both cooling-dehumidification and heating-humidification modes with ventilation. In order to estimate the heating-humidification performance of the proposed system, a small-scale model experiment was conducted and a numerical analysismodel was developed. By using the developed numerical analysis model, a sensitivity analysis was conducted with performance-parameters such as air flow rate, quantity of desiccant, mass flow rate of hot and cold water, temperature of hot and cold water and transposed interval.