An　experimental　latent-thermal　energy　storage　device　(LTESD)　with　a　flat　miniature　heat　pipe　array　(FMHPA)　as　a　core　heat　transfer　element　is　designed.　Multihole　flat　pipes　are　utilized　as　a　heat　supply　and　heat　removal　loop　for　the　passage　of　heat　transfer　fluid　(HTF).　Experiments　are　performed　at　different　HTF　volume　flow　rates　and　inlet　temperatures　to　investigate　the　performance　of　the　thermal　storage　unit　consisting　of　FMHPA　and　vertical　fins　and　to　observe　the　change　in　the　temperature　of　phase-change　materials,　such　as　lauric　acid.　The　effects　of　heating/cooling　section　length　and　thermal　resistance　are　also　examined.　Results　indicate　that　LTESD　works　stably　and　efficiently　and　the　respective　storing　and　releasing　power　are　1299　and　1120　W　under　standard＂　operating　conditions　of　2　L/min　at　70　degrees　C　and　2　L/min　at　15　degrees　C.　(C)　2017　Elsevier　Ltd.　All　rights　reserved.