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

研究了以石蜡为相变蓄热材料的微胶囊水溶液的热物性、储热特性和热传输特性，测量了微胶囊水溶液的密度、比热、熔化热、导热系数和粘度。结果表明，微胶囊水溶液的密度、比热和熔化热可以从组成材料的浓度和性能两个方面进行评价。用欧肯模型估算了水溶液微胶囊的导热系数。采用幂函数模型描述微胶囊水溶液的粘度。并将假塑性粘度和指数表示为温度和微胶囊质量浓度的函数。水…的储热特性用直接接触传热法研究了微胶囊的更多r溶液。将微胶囊的水溶液装入矩形容器中，从容器底部引出细小的气泡。研究了风速、风温和铺层高度对蓄热性能的影响。在高风速条件下，气泡相互结合，有效换热面积减小。因此，在高风速条件下，蓄热过程被推迟。推导了预测完全蓄热所需时间的无量纲关联式，并测量了微胶囊水溶液在直圆管中的压降特性。管内压降随微胶囊质量浓度的增加而增大。与纯水相比，导热速率明显提高。这一事实表明，建造管道的初始成本预计将低于使用纯净水的情况。较少

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