Abstract
In air-conditioning, it is desirable that liquid-solid phase change temperature of a cold energy storage material is around 10 degrees Celsius from a viewpoint of the improvement of COP. Moreover, the thermal storage material that forms slurry can realize large heat capacity of working fluids. Since the solid adhering to the heat transfer surface forms a thermal resistance layer and reduces the rate of cold storage remarkably, it is important to avoid the adhesion of thicker solid layer on the surface for realizing the efficient energy storage. Considering a harvest type cooling unit, the force required for grabbing off 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 heating surface material on the adhesion of TBAB hydrate to the heating surface was examined experimentally.
