The　heat　pipe　radiator　directly　driven　by　heat　pump　heating　system　has　the　advantages　of　fast　heat　transfer　and　high　energy　efficiency.　Based　on　the　empirical　heat　transfer　formula,　the　heat　and　mass　transfer　process　in　the　heat　pipe　radiator　was　studied.　The　key　parameters　in　the　empirical　heat　transfer　formula　were　derived　by　combining　with　the　experimental　data.　The　distribution　of　the　thickness　of　the　condensate　film　and　the　heat　transfer　coefficient　in　the　height　direction　of　the　heat　pipe　radiator　was　analyzed.　The　influence　of　the　working　fluid　condensate　mass　and　vapour　mass　in　the　heat　pipe　radiator　was　investigated.　The　results　showed　that　the　thickness　of　the　liquid　film　changes　from　the　bottom　of　0.1110　mm　to　the　top　of　0.0594　mm　along　the　height　of　the　heat　pipe.　The　minimum　charge　of　working　fluid　is　1.78　kg　to　1.81　kg　and　the　heating　COP　of　the　system　still　reach　to　3.14　even　at　the　outdoor　temperature　of　-12.6　°C.　©　(2024),　(Serbian　Society　of　Heat　Transfer　Engineers).　All　rights　reserved.