The　simultaneous　charging　and　discharging　(SCD)　mode　of　the　Phase　Change　Cool　Storage　(PCCS)　device　ensures　continuous　utilization　of　solar　energy　by　the　solar　air　conditioning　system.　This　study　presents　a　PCCS　device　that　utilizes　flat　micro-heat　pipe　arrays　as　its　core　heat　transfer　component.　Through　experimental　and　numerical　simulations,　the　heat　transfer　performance　of　the　SCD　process　is　investigated.　Finally,　the　Response　Surface　Method　is　employed　to　optimize　the　fin　structural　parameters　of　the　device.　Results　indicate　that　the　SCD　process　eventually　reaches　a　relatively　stable　state.　Under　the　conditions　of　this　study,　a　higher　inlet　temperature　of　the　cold　heat　transfer　fluid　(HTF)　results　in　a　shorter　steady-state　time　and　lower　steady-state　power.　Conversely,　a　lower　inlet　temperature　of　the　hot　HTF　exhibits　a　similar　trend.　When　the　volume　flow　rate　of　HTF　exceeds　1.5　L/　min,　further　increases　in　flow　rate　result　in　minimal　improvements　in　the　heat　transfer　performance　of　the　PCCS　device.　The　initial　state　of　the　phase　change　material　(PCM)　has　no　impact　on　the　steady-state　temperature,　steady-state　power,　or　steady-state　liquid　fraction.　However,　when　the　PCM　is　initially　solid,　the　steady-state　time　is　extended.　Compared　with　the　original　device,　the　optimized　PCCS　device　exhibits　a　28.62　%　reduction　in　steady-state　time,　a　30.63　%　increase　in　cold　storage　capacity,　and　a　0.74　%　improvement　in　steady-state　power　with　a　constant　mass　of　the　PCM.