Patent ID: 8726507

Claim:
Method for manufacturing a surface heat exchanger ( 1 ), said method comprising at least the following steps: a) corrugating a first sheet metal plate ( 2 ), by forming a plurality of folds; b) the folds ( 3 ) including a portion that is open and a portion that is closed; c) placing the first corrugated sheet metal plate onto ( 2 ) a second sheet metal plate ( 6 ); d) brazing the closed portion of the folds in order to provide fins ( 3 ) to said surface heat exchanger, said fins to be located in an air flow ( 3 ) and brazing the first corrugated sheet metal plate ( 2 ) to the second sheet metal plate ( 6 ); wherein the brazing of first corrugated sheet metal plate and second sheet metal plates joins the open portions of the first corrugated sheet metal plate with the second sheet metal plate such that openings for a fluid are formed between the first corrugated sheet metal plate and the second sheet metal plate.