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The finned tubes are the main components of a heat exchanger. They are a series of tubes where fins have been added to increase contact area with the outside fluid. This leads to the exchange between the heat inside the tube (i.e. steam) and the fluid outside the tube (air). Multiple types and shapes of finned tubes exist including round tubes, oval tubes, or flat tubes. Flat tubes made of aluminium clad carbon steel tubes with aluminium brazed fins, so called SRC©, are the state of the art for power plant Air Cooled Condenser.