In particular embodiments, a method includes receiving, by a computing device including an importexport framework, encoded client data. In the connection structure between the heat transfer pipe and the capillary tube, a pinched part in which a pipe end part of the capillary tube is inserted and a brazing filler material pooling part for pooling on a pipe end face side of the pinched part the brazing filler material that flows into the pinched part are formed. A first pump is attached to the second wall and providing first input and output ports, the first pump is coupled to the output of the power input through an input of the first pump.