Fundamental Study of Cold Energy Storage and Energy Release Systems of Fine Capsulated Latent-Heat Storage Material-Water Mixture. 3rd Report. Measurement of Cold Energy Release Characteristics in Direct Heat Exchanger between Air and Water Laden with Fine Capsules Containing Latent Heat Material.

Abstract

This paper deals with cold energy release characteristics of a fine capsulated latent-heat storage material-water mixture as a latent-heat-storage material having a low melting point of the core material (pentadecane, C15H32, freezing point 283.1 K). A direct-contact heat exchange method for an air-fine capsulated latent heat storage material-water mixture was selected to investigate the cold energy release characteristics from the mixture layer including the solidified core latent-heat-storage materials. The temperature effectiveness, the sensible-heat release time and the latent-heat release time were measured as experimental parameters. Useful nondimensional correlation equations for those parameters were derived in terms of nondimensional level of the mixture layer dimension, Reynolds number for air flow, Stefan number and heat capacity ratio.