Numerical study of a multiple-segment metal foam-PCM latent heat storage unit: Effect of porosity, pore density and location of heat source
Numerical study of a multiple-segment metal foam-PCM latent heat storage unit: Effect of porosity, pore density and location of heat source
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DOI：
10.1016/j.energy.2019.116108
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发表时间：
2019-12
期刊：
影响因子：
9
通讯作者：
P. Sardari;H. Mohammed;D. Giddings;G. Walker;M. Gillott;D. Grant
中科院分区：
文献类型：
--
作者：
P. Sardari;H. Mohammed;D. Giddings;G. Walker;M. Gillott;D. Grant
本研究以数值模拟的方式，探讨在不同变数的影响下，以泡沫铜为基材的储热系统在垂直容器内的熔化过程。不同的情况下进行了研究和比较，包括可变的孔隙率和孔密度，非平衡多孔介质模型，多段金属泡沫案件和不同的加热器的位置在系统中的液体分数和温度的等高线图和图表所呈现的效果。结果表明，与其自身的PCM相比，泡沫铜-PCM单元的性能更高，熔化时间减少了近85%。通过改变恒温加热器的位置，从底部到侧面和顶部表面，熔化时间分别减少了70.5%和4.7%。通过使用多段多孔系统，熔化时间减少了3.5%，与均匀孔隙率的情况相比。此外，更准确的非平衡数值模型显示了7.4%的差异，在熔化时间相比，平衡模型。本研究优化了设计，以提高实际应用性能，并减少浪费能源。
This study numerically investigates the performance of the melting process for a PCM based heat storage system under the effect of different variables in a vertical container with a copper metal foam. Different cases were studied and compared including the effects of variable porosities and pore densities, non-equilibrium porous medium model, a multiple-segment metal foam case and different heater locations in the system on the liquid fraction and temperature as presented by contour plots and diagrams. The results show high performance for the copper foam-PCM unit compared with on its own PCM, for reducing the melting time by almost 85%. By changing the location of constant temperature heater from the bottom to the side and top surface, the melting time decreases by 70.5% and 4.7%, respectively. By using a multiple-segment porous system, the melting time reduces by 3.5% compared with the case of uniform porosity. Furthermore, the more accurate non-equilibrium numerical model shows a 7.4% difference in the melting time compared with the equilibrium model. This study optimises the design to improve practical application performance and to reduce waste energy.