直交流熱交換器型吸着器を用いたデシカント調湿システムの水蒸気吸着特性

抄録

We have focused on a novel desiccant unit using heat exchanger coated with adsorbent. The unit has the advantage to remove heat of adsorption actively by flowing cooling air. Consequently, it is expected to improve dehumidification performance of the system by promotion of water adsorption under isothermal condition. In this study, in order to investigate the effect of cooling air on water adsorption, we had made a lab-scale experimental set-up using cross-flow heat exchanger coated with silica-gel, and conducted adsorption experiments under various process air and cooling air velocities and amounts of coated silica-gel. As a result, it was demonstrated that cooling of desiccant unit by flowing air was greatly effective to enhance adsorption of water on silica gel; e.g. water adsorption ratio at 8 min with cooling has been improved 2.2 times higher than that without cooling. An amount of adsorbed water was found to increase as both cooling air and process air velocities at each time. Adsorption rate in an initial period was improved by decreasing in amount of coated silica-gel. It is also indicated that further heat transfer enhancement and reduction of sensible heat of the adsorber are required to achieve higher water adsorption performance.