Phase　change　heat　storage　technology　has　received　extensive　attention　because　it　can　ease　the　energy　utilization　problem　of　uneven　energy　distribution　in　time　and　space.　In　this　study,　a　multichannel　flat　tube　phase　change　thermal　storage　unit　that　adopts　a　new　multichannel　flat　tube　as　the　core　heat　transfer　element,　air　as　the　heat　transfer　fluid,　and　lauric　acid　as　the　phase　change　material　is　designed　and　fabricated.　Experimental　results　show　the　charging/discharging　temperature　and　power　variation　curve　of　the　device　at　different　air　volumes　and　inlet　temperatures.　The　optimum　heat　transfer　fluid　flow　was　obtained　through　experiments.　Compared　with　1D　and　2D　numerical　models　proposed　by　other　researchers,　we　presented　and　established　a　3D　numerical　model　to　verify　the　experimental　results.　The　simulation　results　exhibit　good　agreement　with　the　experimental　results　and　show　that　the　natural　convection　of　phase　change　material　in　the　melting　process　plays　an　important　role　in　accelerating　melting.