Improving　the　performance　of　latent　heat　storage　unit　is　crucial　for　effectively　recovering　waste　heat　under　small　temperature　differences.　This　study　presents　an　latent　heat　storage　unit　based　on　a　multichannel　parallel　flow　flat　tube　and　compact　fins.　Water　is　used　as　the　heat　transfer　fluid.　Lauric　acid　is　used　as　a　phase　change　material,　with　an　82.5　%　filling　ratio.　This　study　experimentally　investigates　the　effects　of　heat　transfer　fluid　injection　methods,　inlet　temperatures,　and　flow　rates　on　the　charging　and　discharging　performance　of　the　unit　by　analyzing　its　thermal　performance　under　small　temperature　differences.　During　the　charging　process,　the　temperature　differential　between　the　inlet　and　outlet　of　the　bottom　injection　heat　transfer　fluid　is　a　maximum　of　0.8　degrees　C　higher　than　that　of　the　top　injection　heat　transfer　fluid.　This　finding　indicates　the　superior　performance　of　the　bottom　injection.　The　inlet　temperature　remarkably　influences　the　unit＇s　heat　transfer　performance,　increasing　by　15　degrees　C　during　charging.　The　completion　time　of　phase　change　is　reduced　by　61.5　%,　and　the　average　specific　power　improves　by　43.1　%.　The　suitable　flow　rate　for　operating　conditions　is　100　L/h.　Additionally,　the　minimum　temperature　difference　between　the　melting　temperature　of　phase　change　material　and　the　inlet　temperature　of　heat　transfer　fluid　is　2　degrees　C,　the　charging　and　discharging　specific　power　is　25.18　and　20.23　W/kg,　and　the　average　effectiveness　can　reach　0.1953　and　0.1731.