Effect of hole distribution form on heat transfer of partially PCM filled light weight wall
It aims to optimize the holes distribution form to improve the heat transfer performance of light weight walls partially filled with phase-change material(PCM).Focusing on four holes distribution forms in perforated brick partially filled with PCM under the same porosity,a coupled heat transfer model of natural convection and phase change heat con-duction is established.The effects of these forms on the internal and external wall surface temperature,heat flux density and molten liquid fraction were analyzed using numerical simulation under periodic boundary conditions.The results reveal that the four types of walls can reduce the outdoor temperature amplitude and delay its transfer.Decreasing hole dispersionenhances the average temperature amplitude and delay on both internal and external surfaces,as well as the average heat flux amplitude of internal surface,while reducing the average heat flux of the internal and external surfaces,the average heat flux amplitude of the external surface and the PCM liquid fraction.Particularly,the Case2 configuration,with the smallest degree of pore dispersion,exhibits superior heat transfer performance,showing a decrease in the average temperature of the inner surface by 0.14-0.50 K,the average heat flux density on the inner surface by 1.24-4.29 W/m2,and the average liquid fraction of PCM by 0.024-0.114.The airflow di-rection in the hole near outdoor changes with time,while the right side remains unchanged.The distribution of holes should be considered in the optimal design of the geometric structure of the new light weight wall.
light weight wallphase change materialholedistribution formheat transfer characteristics
万方数据
维普
