Heat transfer studies of building brick containing phase change materials
Heat transfer studies of building brick containing phase change materials
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DOI：
10.1016/j.solener.2017.07.072
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发表时间：
2017-10
期刊：
影响因子：
6.7
通讯作者：
K. Kant;A. Shukla;A. Sharma
中科院分区：
文献类型：
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作者：
K. Kant;A. Shukla;A. Sharma
本研究涉及建筑砖含有相变材料（PCM）时，受到周围的天气条件，如太阳辐射和环境温度的热分析。对含有相变材料的建筑砖进行了热模拟，以利用高熔化潜热来改善建筑物的室内舒适性。在本文提出的热模型中，PCM填充在砖的圆柱形空腔中。采用有限元分析方法，考虑相变材料内部的传热传质，对相变材料内部的传热传质过程进行了二维数值模拟。通过比较三种不同的情况-普通砖、圆柱形空腔中填充空气的砖和圆柱形空腔中填充PCM的砖，评估了PCM在建筑砖中的有效性。此外，该研究还考虑了不同的PCM，具有不同数量的单个PCM以及多个PCM。所得结果表明，与石蜡和RT-25相比，癸酸是更有效的PCM。当癸酸填充在三个圆柱形空腔中时，最大热流密度降低为8.31%。从目前的研究来看，相变材料在建筑砖中的应用也是一种有效的建筑被动热控制技术。
The present study deals with the thermal analysis of building bricks containing phase change materials (PCM) when subjected to ambient weather conditions such as solar radiation and ambient temperature. Thermal modelling of building bricks containing PCM has been carried out to utilise the high latent heat of fusion for indoor comfort in buildings. In the thermal model presented in this paper, the PCM is filled in the cylindrical cavity of the bricks. The two-dimensional numerical study has been carried out using finite element analysis method considering heat and mass transfer in the PCM. The effectiveness of PCM in the building bricks has been evaluated by comparing the three different cases - the normal bricks, bricks with air filled in the cylindrical cavity and bricks with PCM filled in the cylindrical cavity. Additionally, the study has also been carried out considering different PCMs, with a varying quantity of single PCM as well as multiple PCM. The obtained results indicate that the Capric acid is more effective PCM in comparison to the Paraffin and RT-25. The maximum heat flux reduction is found to be 8.31% with Capric acid filled in three cylindrical cavities. From the present study, it is also evident that the application of PCM in building brick could be an effective technique for passive thermal control of buildings.