In　this　paper,　a　composite　two-stage　ventilation　heat　recovery　system　with　heat　pipe　and　heat　pump　is　proposed,　heat　pipe　is　used　to　recover　the　exhaust　air　energy　to　improve　the　operating　performance　of　the　system　under　all　operating　conditions.　The　split　heat　pipe　heat　exchanger　is　designed　and　manufactured,　the　working　characteristics　and　performance　of　the　composite　heat　recovery　system　under　different　working　conditions　are　tested,　and　it　is　compared　with　the　parallel-loop　heat　pump　ventilation　heat　recovery　system　also.　The　results　show　that　the　optimal　working　fluid　charge　rate　of　the　split　heat　pipe　used　in　the　composite　system　is　50%∼60%,　the　temperature　efficiency　of　the　composite　system　in　winter　is　higher　than　64.31%,　the　heating　COP　is　up　to　7.17,　and　the　total　heating　capacity　is　5.09　kW.　Temperature　efficiency　and　heating　capacity　of　the　system　are　4.01%∼66.6%　and　7.68%∼67.19%　higher　than　that　of　the　double　loop　heat　pump　heat　recovery　system,　respectively.　©　2024