In　the　present　study,　the　thermal　performance　of　a　latent　heat　thermal　energy　storage　device　based　on　flat　miniature　heat　pipe　arrays　with　straight　rectangular　fins　during　the　charging　process　is　numerically　investigated　using　porous　media　to　reduce　computational　resources　and　time.　Air　is　selected　as　the　heat　transfer　fluid　(HTF).　The　influence　of　a　thermal　storage　unit　(TSU)　with　one　heat　transfer　component　(HTC)　on　the　melting　rates　of　the　phase　change　material　(PCM)　is　simulated　at　different　inlet　temperatures　and　flow　rates　of　HTF.　The　heat　transfer　between　two　HTCs　that　form　a　tandem　is　analyzed　and　compared,　and　the　effect　of　different　arrangements　of　the　two　HTCs　on　the　charging　process　is　then　studied.　Results　indicate　that　the　inlet　temperature　and　the　volume　flow　rate　of　the　TSU　influence　the　charging　process.　The　average　outlet　temperature　and　charging　power,　which　grow　in　a　power　function　relationship　with　the　volume　flow　rates,　increase　linearly　with　the　inlet　temperatures.　The　average　charging　power　of　the　HTF　through　HTC-2　is　reduced　by　approximately　63.71%　compared　with　HTC-1　when　the　two　HTCs　form　a　tandem.　The　average　charging　power　of　the　TSU　with　two　HTCs　connected　in　tandem　is　higher　than　that　of　the　parallel　TSU　at　the　same　inlet　temperature　and　volume　flow　rate.