The vacuum tubes absorb the solar irradiation and then heat up the copper heat pipe inside the vacuum tube. The copper heat pipe conducts the heat to the top end inside the module. And then the heat will be transferred by the medium to the heat exchanger in the water tank. The medium was circulated by a pump inside the working station. 1). Size?of tubes:???Φ47*1500mm Φ47*1800mm??Φ58*1800mm??? 2).? Type of tube:?????Heat pipe?vacuum tubes