Parametric studies on packed bed storage unit filled with PCM encapsulated spherical containers for low temperature solar air heating applications
Parametric studies on packed bed storage unit filled with PCM encapsulated spherical containers for low temperature solar air heating applications
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DOI：
10.1016/j.enconman.2013.10.042
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发表时间：
2014-02-01
影响因子：
10.4
通讯作者：
Velraj, R.
中科院分区：
文献类型：
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作者：
Karthikeyan, S.;Solomon, G. Ravikumar;Velraj, R.
本工作的重点是进行参数研究的填充床存储单元的性能与相变材料（PCM）封装的球形容器，适合于低温太阳能空气加热应用。使用经验证的基于焓的数值模型进行参数分析，该模型考虑PCM容器内部的热梯度。模拟分析结果表明，相变材料球尺寸、流体入口温度和传热流体（HTF）质量流量分别影响填充床的传热面积、HTF与相变材料球之间的温差以及HTF与相变材料球之间的表面对流换热系数。由于空气提供的高表面对流阻力，PCM的不良导热性对热传递的影响可以忽略不计。利用充热时间、瞬时蓄热量和充热过程中的累积蓄热量分析了各参数对所选取值范围的影响。(C)2013爱思唯尔有限公司保留所有权利。
The focus of the present work is to perform parametric studies on the performance of a packed bed storage unit filled with phase change material (PCM) encapsulated spherical containers, suitable for low temperature solar air heating applications. A parametric analysis was carried out using the validated enthalpy based numerical model that considers the thermal gradient inside the PCM container. The results of simulation analysis showed that the size of the PCM ball, fluid inlet temperature and the mass flow rate of the heat transfer fluid (HTF) influenced respectively the heat transfer area in the packed bed, temperature difference between the HTF and PCM and the surface convective heat transfer coefficient between the HTF and PCM balls. The poor thermal conductivity of the PCM has only negligible effect on heat transfer due to high surface convective resistance provided by the air. The influence of various parameters for the selected range of values were analyzed using the charging time, instantaneous heat stored and cumulative heat stored during the charging process. (C) 2013 Elsevier Ltd. All rights reserved.