In　this　study,　the　heat　transfer　characteristics　of　a　new-type　flat　micro-heat　pipe　thermal　storage　unit,　which　uses　a　moderate-temperature　paraffin　as　heat　storage　phase　change　material,　were　investigated.　The　basic　structure,　working　principle,　and　design　concept　of　the　thermal　storage　unit　were　discussed.　Experiments　were　conducted　to　study　the　charging　and　discharging　heat　transfer　processes　of　the　thermal　storage　unit　under　different　inlet　temperatures　and　flow　rates　for　the　cold/hot　heat　transfer　fluid　(HTF).　Experimental　results　show　that　the　performance　of　the　thermal　storage　unit　was　steady　and　efficient　during　heat　charging　and　discharging,　and　the　average　charging　and　discharging　powers　of　the　thermal　storage　unit　were　approximately　658　and　894　W,　respectively,　under　specific　experimental　parameters.　(C)　2015　Elsevier　Ltd.　All　rights　reserved.