Performance of a Multipass Honeycomb Adsorber Regenerated by a Direct Hot Water Heating
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Performance of a Multipass Honeycomb Adsorber Regenerated by a Direct Hot Water Heating AKIO KODAMA∗ Division of Innovative Technology and Science, Graduate School of Natural Science and Technology, Kanazawa University, Kakuma-machi, Kanazawa, Ishikawa 920-1192, Japan [email protected]
NAOKI WATANABE, TSUTOMU HIROSE AND MOTONOBU GOTO Department of Applied Chemistry and Biochemistry, Kumamoto University, Kumamoto 860-8555, Japan HIROSHI OKANO Seibu Giken Co., Ltd., Koga, Fukuoka 811-3134, Japan
Abstract. A multi-pass honeycomb rotary adsorber has been proposed to achieve a low temperature heat driven desiccant cooling process. This multi-pass honeycomb rotary adsorber has a sandwich arrangement of honeycomb shaped adsorbent blocks and aluminum passages. In the regeneration step, hot water flows in the passages heating the honeycomb adsorbent. Simultaneously, outside air is co-currently supplied to the adsorbent layer to discharge the desorbed water vapor. On the other hand, adsorption heat caused in the adsorption step can be removed by cool air which is counter-currently passing through inside of the passages to keep the sufficient adsorption capacity/rate. The vaporization heat of water remaining in the passages also accelerates the cooling of the adsorbent rotor. Dehumidifying performance of the above mentioned adsorber has been investigated under various operating conditions, which are air velocity of each sector, temperature of hot water and so on. It was confirmed that the adsorber could be regenerated by direct hot water heating and removal of adsorption heat generated in the adsorption step achieved the semi-isothermal dehumidification. It was also found that lower temperature heat around 50◦ C was still effective in regeneration of the adsorbent rotor although the same temperature air was needed to discharge the desorbed water vapor. At the moment, detailed investigations including the influence of heat transfer between honeycomb rotor and aluminum passage are being carried out to improve the dehumidifying performance. Keywords: 1.
desiccant cooling, dehumidification, adsorption, heat of adsorption
Introduction
Desiccant cooling process is particularly attractive because there are abundant resources of low temperature waste heat, which is discharged from distributed power generation and various cogenerations. Especially a desiccant dehumidification system using a honeycomb adsorbent rotor can supply cooling air with mild-temperature waste heat around 80◦ C. Popular∗ To
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ization of this process accelerates the application of solar heat and industrial waste heat and, as a result, electricity consumption and carbon-dioxide emission can be cut down. This system is ambient air introduction/humidity conditioning system. If it is located in such place requiring large amount of ventilation, for example school, laboratory and factory, energy consumption will be greatly decreased. Widespread use of PEFC (Polymer Electrolyte Fuel Cell) is anticipated in the governme
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