|
doi: 10.3850/978-981-08-7614-2_IMPRES038
Preparation of Novel Composite Sorbent for Water Vapor Sorption
Mikio Kumita1,a, Masaki Meiwa1, Keisuke Watanabe1 and Akio Kodama2
1School of Natural System, College of Science and Engineering, Kanazawa University, Kakuma-machi, Kanazawa, Ishikawa 920-1192, Japan.
akumita@t.kanazawa-u.ac.jp
2School of Mechanical Engineering, College of Science and Engineering, Kanazawa University, Kakuma-machi, Kanazawa, Ishikawa 920-1192, Japan
ABSTRACT
In the present study, we propose a novel solid sorbent, which is composed of anodized aluminum and calcium chloride, for water sorption chillers and heat pumps. Aluminum is electrolyzed in acid baths with the result that a thin and porous oxide film called alumite is formed on its surface. The alumites prepared using an electrolytic bath of sulfuric acid have a thickness from 8 to 100 μm and a pore diameter from 6 to 22 nm. The physical properties of the oxide film can be controlled by electrolytic conditions such as current density, processing time and temperature. The calcium chloride-alumite composite sorbent has been prepared by the solution impregnating method. The amount of calcium chloride impregnated on the alumites reaches up to 16.1 wt%, and the deposition of calcium chloride in the aluminum oxide layer has been confirmed by X-ray analysis. The experimental results shows that bare alumite adsorbs very little water vapor, but the prepared calcium chloride-alumite composite is active against water vapor even in the low pressure range. Hence, this composite is a promising sorbent for adsorption chillers and heat pumps using water as working fluid.
Keywords: Water vapor sorption, Composite material, Alumite, Calcium chloride, Adsorption chilling.
Back to TOC
FULL TEXT(PDF)
|