The　decrease　of　photovoltaic　(PV)　cell　temperature　by　10　°C　is　expected　to　improve　the　PV　electrical　efficiency　by　0.6-0.7%　based　on　the　reference　efficiency　of　15%.　Different　cooling　liquids　like　air　and　water　have　been　introduced　to　pass　across　the　PVs　to　reduce　the　cell　temperature,　and　thus　increase　the　electrical　efficiency.　In　this　paper,　the　refrigerant　R134a　was　used　as　the　cooling　liquid　and　a　PV/thermal　(PV/T)　collector　was　coupled　with　a　heat　pump　system　acting　as　the　evaporator,　which　was　expected　to　achieve　a　better　cooling　effect　and　energy　performance　due　to　its　low　boiling　temperature.　A　hybrid　PV/T　collector,　made　of　6　glass　vacuum　tube　-　PV　module　-　aluminum　sheet　-　cooper　tube　sandwiches　connected　in　series,　worked　as　the　evaporator　of　the　heat　pump　system.　Numerical　steady　models　were　established　for　each　component　of　the　heat　pump　system　and　part　of　the　PV/T　collector/evaporator　for　predicting　their　energy　performance　under　the　weather　data　of　January　14th　at　Tibet,　China.　The　results　showed　that　the　maximum　COP　could　reach　up　to　7.6.　The　daily　average　thermal　efficiency　and　electrical　efficiency　were　0.764　and　0.104,　respectively.　©　(2012)　Trans　Tech　Publications,　Switzerland.