土坯热物性对储热装置充放热性能影响研究

储热系统的充放热能力直接关系到对太阳能的热利用率,对以土坯为储热材料的储热装置充放热性能进行了分析。对储热装置进行简化处理,并建立土坯二维、流体一维非稳态传热模型,利用该模型考察储热块密度、导热系数及比热容对储热装置储放热时长的影响。结果表明:储放热时长随着储热块密度的增大呈线性增大;随着导热系数的增大储放热时长先明显减小,增大到1.4 W/(m·K)后其对储放热时长的影响变小;储放热时长随着比热容的增大一直增大,热物性对储放热时长的影响可为合理选取储热材料提供参考。

Charge and Discharge Performance of Thermal Storage Device of Adobe Thermal Properties

The charge and discharge ability of the thermal storage system is directly related to the efficiency of solar energy heat utilization.So the charge and discharge performance of the thermal storage device filled the adobe block,which is heat storage material,is studied.By simplifying treatment for storing heat device,the unsteady-state heat transfer model includes two-dimensional of thermal storage materials and the one-dimensional of heat transfer fluid are established.1 Through the establishment of the heat transfer model,the effect of density,coefficient of thermal conductivity and specific heat capacity on thermal charge and discharge time length of thermal storage devices are learned,and the heat storage capacity of the apparatus is analyzed.The results show that the charge and discharge time length increases with the linear increase of density;Along with the growth of the coefficient of thermal conductivity,firstly,the charge and discharge time length increases obviously,and then when the coefficient of thermal conductivity rises to 1.4 W/ (m · ℃C),it has weaker effect on the charge and discharge time length;the charge and discharge time length always increases with the linear increase of density;the thermal properties can provide the reference for choosing suitable thermal storage materials.