Latent　heat　storage　technology　is　a　valuable　research　direction　to　alleviate　the　imbalance　of　energy　supply　and　demand,　but　its　application　is　limited　by　the　low　thermal　conductivity　of　phase　change　material.　In　recent　years,　the　fin-foam　structure　is　proven　to　alleviate　this　problem.　The　solidification　behavior　of　the　phase　change　material　in　this　structure　should　be　predicted　to　promote　its　engineering　application.　In　this　study,　a　cold　thermal　energy　storage　unit　with　metal　foam　and　straight　fins　was　constructed.　On　the　basis　of　dimensionless　analysis,　experimental　and　numerical　methods　were　used　to　investigate　the　structural　parameters　of　straight　fin　and　metal　foam　on　the　liquid　fraction　and　effective　Nusselt　number　(　Nu　*).　Results　showed　that　the　height　and　spacing　of　fin　are　the　main　factors　affecting　the　solidification　rate　of　phase　change　material,　compared　with　the　porosity,　pore　density　and　material　of　metal　foam.　When　fin　height　increases　from　17　to　57　mm　and　spacing　reduces　from　120　to　3　mm,　the　Nu　*　of　the　phase　change　material　increases　by　1.5　and　12.61　times,　respectively.　The　transient　correlation　between　liquid　fraction　and　Nu　*　of　phase　change　materials　is　obtained　to　guide　related　design.(c)　2022　Elsevier　Ltd.　All　rights　reserved.