基于多相变材料的分腔式蓄热器蓄热性能优化

OPTIMIZATION OF HEAT STORAGE PERFORMANCE OF SEPARATED CELLS TUBE BASED ON MULTI-PHASE CHANGE MATERIAL

通过数值方法建立基于多相变材料的分腔式蓄热器模型,研究4种模型的的蓄热特性,并通过温差分析选择RT25和LA这2种不同熔点的PCM组合,提出不同填充形式的组合方案。数值模拟结果表明:当采用上下分腔结构时,下部腔室低熔点相变材料的选择,应根据单一相变材料完全融化时,上下腔室的温度差来作选择;此外,所采用的单独多相变材料组合和单独加肋片分腔2种优化方法具有近似的蓄热效率,但当两者结合时,蓄热效率可得到很大提升,完全融化时间可减少72%;另外,当考虑环形分腔的不同PCM组合方案时,沿径向温度分布,填充不同相变材料有更好的蓄热效果。

Based on the numerical method,a separated cells tube based on multi-phase change material(PCM)models were established.After studying the heat storage characteristics of the four models based on the temperature difference analysis,RT25 and LA two different melting point PCMs were seleted as a combination,then proposed different forms of filling.Numerical simulation results show that:when using the upper and lower separated cells structure,the selection of the lower cell phase change material should be based on a single phase change material completely melted,the temperature difference between the upper and lower cells to choose.In addition,the two multi-phase change material combination and the individual fin-added cell optimization method have approximate thermal storage efficiency.However,when the combination of two methods,the heat storage efficiency can be greatly improved and the total melting time can be reduced by 72%;Besides,when considering different PCMs combination of toroidal separated cells,it is better to fill different phase-change materials along the radial temperature distribution.