(740d) Desiccant Air Conditioning System Using Circulating Fluidized Bed and Its Application to Low Dew Point Air Production

Various technologies have been conducting to solve the global warming problem. Reduction of humidity in the air is one of the key technologies for the effective energy conservation. A new desiccant air conditioning system using a circulating fluidized bed is proposed as a promising technology and clarified the characteristics of dehumidification using a small experimental apparatus. In addition, the estimation of the system scale is discussed using a developed model to produce the large quantity of low dew point air.

According to the experimental results, the proposed system is superior to the conventional rotor system from the viewpoint of pressure drop and dehumidification ability. Therefore, the proposed system can be applied to the energy conservative air conditioner and has the possibility to apply the large quantity of low dew point air.

Optional experimental study has been conducted to confirm the desorption performance of desiccant particles in a bubbling fluidized bed. Long time operation is enough to make particles for producing the low dew point air. It is clear that the decreasing the water content in the particles makes the air humidity lower regardless of inlet air condition. According to the adsorption isotherm, it is considered that the production of air whose dew point is -60 degree Celsius will be achieved when the water content rate becomes 1.5% in the particles.

Followings are conclusive remarks. The new system is proposed and examined experimentally to produce the low dew point air. Some conditions such as residence time and system scale are discussed using developed model based on the material balance. The system can be applied to the large quantity of low dew point air.