基于LBM的泡沫金属与翅片相变储能系统性能对比分析OA北大核心CSTPCD

To investigate the influence of fins and copper metal foam on the performance of phase-change energy storage systems,composite phase-change material(PCM)models with 20 and 30 pore per inch(PPI)were constructed using the quartet structure generation set.Additionally,a finned PCM model with an equal copper mass was constructed.Subsequently,numerical simulation based on the lattice Boltzmann method was employed to simulate the heat storage/release process of PCM.The effects of adding fins and foam metal structures on the heat transfer performance of PCM were compared and analyzed based on Nusselt number,liquid fraction,PCM flow rate,and PCM melting/solidification time.The results showed that the presence of foam metal during the heat storage process hindered the development of convective heat transfer during the melting process.The Nusselt number of the double fin structure was higher than that of the foam metal structure,resulting in a shorter melting time for double fin structure.Compared to the 20 PPI and 30 PPI foam copper composite PCMs,the melting time was reduced by 28.55%and 17.5%,respectively.During the heat release process,the presence of foam metal increased the heat conduction area.The solidification speed of the foam metal structure was higher than that of the fin structure,and the solidification time of the 30 PPI foam metal structure was reduced by 65.80%and 20.24%compared to the fin and 20 PPI foam copper composite PCMs,respectively.Considering the heat storage and release processes,the total heat storage/release time of the 30 PPI foam metal structure was the shortest,with reductions of 27.81%and 15.32%compared to the fin and 20 PPI foam copper composite PCMs,respectively.Under the condition of consuming the same amount of metal material,adopting the foam structure is a more effective means to improve energy storage efficiency.