A Study on Heat Storage and Heat Transportation Characteristics of Water Solution of Micro-capsule Including Phase Change Material

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The present study investigated the thermophysical properties, the heat storage characteristics and the heat transportation characteristics of water solution of micro capsule, which contained paraffin wax as a latent heat storage material.The density, the specific heat, the heat of fusion, the thermal conductivity and the viscosity of the water solution of micro capsule were measured. As a result, it was found that the density and the specific heat and the heat of fusion of the water wolution of micro capcule were able to evaluate from the concentration and the properties of the component material. The thermal conductivity of the water solution micro capsule was also estimated by using the Eucken's model. The power law model was applied to express the viscosity of the water solution of micro capsule. And the pseudoplastic viscosity and the index number were expressed as a function of the temperature and the mass concentration of micro capsule.The heat storage characteristics of the wate … More r solution of micro capsule was investigated by using the direct contact heat transfer method. The water solution of micro capsule was filled in a rectangular vessel and fine air bubbles were induced from the bottom of the vessel. The effect of the air velocity, the air temperature and the layr height on the heat storage characteristics were investigated. In the case of the high air velocity condition, the air bubbles united each other and effective heat transfer area were decreased. Therefore, the heat storage process was delayd in the high air velocity condition. A non-dimensional correlation to predict the time taken for the complete heat storage was derived.The pressure drop characteristics of water solution of micro capsule in a straight circular tube were measured. The pressure drop in the tube was increased with an increase in the mass concentration of the micro capsule. Compared with the case of pure water, the heat transportation rate was obviously increased. This fact indicated that the initial cost for constructing pipe lines was expected to be lower than the case using pure water. Less