The　molten　salt　single-tank　thermal　storage　heating　system　is　a　low-cost　clean　energy　heating　mode　that　realizes　heat　storage　by　built-in　electric　heaters　and　heat　release　by　built-in　coil　heat　exchangers.　The　built-in　coil　heat　exchanger　area　of　this　system　increases　with　the　increase　of　heating　load,　which　leads　to　the　arrangement　of　the　coil　heat　exchanger　directly　affects　the　heat　release　performance　of　the　single　tank　heat　storage　system.　In　order　to　obtain　the　best　arrangement　of　coil　heat　exchanger　in　a　single　tank,　this　paper　investigates　the　effect　of　different　coil　heat　exchanger　arrangements　with　the　same　heat　exchanger　area　on　the　heat　release　performance　of　the　single　tank　heat　storage　system　by　using　numerical　calculation　method.　The　results　show　that　the　heat　release　performance　of　the　staggered　double　spiral　coil　heat　exchanger　is　better　than　that　of　the　single　row　coil　heat　exchanger,　and　the　capacity,　discharge　temperature　and　accumulated　heat　release　are　the　largest　for　the　arrangement　with　high　inner　coil　and　low　outer　coil　(hi=90　mm,　ho=174　mm).　The　results　of　this　paper　provide　a　theoretical　basis　for　the　design　of　heat　exchanger　with　electrically　heating　molten　salt　single　tank　heat　storage.　©　2022,　Solar　Energy　Periodical　Office　Co.,　Ltd.　All　right　reserved.