Impact of fin spacing on temperature distribution in adsorption cooling system for vehicle A/C applications |
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Affiliation: | 1. Green Asia Education Center, Interdisciplinary Graduate School of Engineering Sciences, Kyushu University, Kasuga-koen 6-1, Kasuga-shi, Fukuoka 816-8580, Japan;2. Faculty of Engineering Sciences, Kyushu University, 6-1, Kasuga-koen, Kasuga-shi, Fukuoka 816-8580, Japan;3. International Institute for Carbon-Neutral Energy Research (WPI-I2CNER), Kyushu University, 744 Motooka, Nishi-ku, Fukuoka 819-0395, Japan;4. Mechanical Engineering Department, Kyushu University, 744 Motooka, Nishi-ku, Fukuoka 819-0395, Japan;5. Calsonic Kansei Corporation, 2-1917 Nisshin-cho, Kita-ku, Saitama City, Saitama, Japan |
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Abstract: | Effects of fin spacing on the temperature distribution in a finned tube adsorber bed are studied to decrease the temperature gradient inside the adsorber bed and minimize the adsorber bed to adsorbent mass ratio (AAMR) for vehicle air conditioning applications. Finned tube adsorber beds have shown higher specific cooling power and coefficient of performance, and low AAMR among the existing adsorber beds. A single-adsorber bed ACS with interchangeable heat exchangers is built and equipped with hermetic type T thermocouples. Two copper heat exchangers with 6.35 mm (1/4″) and 9.5 mm (3/8″) fin spacing are custom-built and packed with 2–4 mm silica gel beads. The experimental results show that by decreasing the fin spacing from 9.5 mm to 6.35 mm, the temperature difference between the fin and adsorbent reduces by 4.6 °C under the cycle time of 600 s and an adsorption to desorption time ratio (ADTR) of one. A greater reduction in the temperature gradient inside the adsorber bed with smaller fin spacing is observed for short cycle time operation, e.g. 600 s, compared to long cycle time operation, e.g. 1400 s. Finally, simultaneous comparison of the temperature gradient between the fins and AAMR against fin spacing indicates that the optimum fin spacing for a finned tube heat exchanger packed with 2–4 mm silica gel beads is about 6 mm. |
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Keywords: | Fin spacing Finned tube heat exchanger Adsorption cooling system Adsorption to desorption time ratio Adsorber bed to adsorbent mass ratio Espacement des ailettes Echangeur de chaleur à tubes à ailettes Système de froid à adsorption Vitesse du passage de l'adsorption à la désorption Rapport du lit adsorbeur et de la masse de l'adsorbant |
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