水和物スラリー生成のための固体面付着固相の剥離特性 : 第2報,水溶液濃度の影響(熱工学,内燃機関,動力など)

概要

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In air-conditioning systems, it is desirable that the liquid-solid phase change temperature of a cool energy storage material is approximately 10℃ from the perspective of improving coefficient of performance (COP). Moreover, a thermal storage material that forms slurry can realize large heat capacity of working fluids. Since the solid that adheres to the heat transfer surface forms a thermal resistance layer and remarkably reduces the rate of cold storage, it is important to avoid the adhesion of a thick solid layer on the surface so as to realize efficient energy storage. Considering a harvest type cooling unit, the force required for removing the solid phase from the heat transfer surface was studied. Tetra-n-butylammonium Bromide (TBAB) clathrate hydrate was used as a cold storage material. The effect of concentration of TBAB solutions on the scraping force for detachment of adhered solid of TBAB hydrate to the heat transfer surface was examined experimentally. The TBAB hydrate solids were categorized broadly into two kinds of solids. The scraping force of the TBAB hydrate solid on the heat transfer surface was different for the two kinds of the TBAB hydrate solids. The scraping force increased with the increase in the concentration of solution. It was confirmed that the concentration of solution had an effect on the scraping force required for removal of the solid.
社団法人日本機械学会の論文
2008-09-25