To positively utilize a moisture adsorbing material as latent heat storage (moisture storage) and as a heat storage medium instead of ice by using a large quantity of moisture adsorbing material although an adsorption type refrigerator is regarded as a defect of enlargement of size.

Although there was an idea of utilizing a part of a building structure with regard to moisture storage, it is not fusion heat of ice or the like quantitatively and mechanically, and there has been no idea of storage of heat of vaporization. When compared with a conventional rotor type desiccant air conditioner, since the moisture absorbing material forms a thick layer, "waste gas of a soiled engine" or the like can be utilized as it is in regeneration only by allowing a heat exchange pipe to pass through the inside of the layer. When absorbing moisture, outside air or return air is allowed to flow through the heat exchange pipe to attain isothermal dehumidification.