Method for preparing evaporator for reducing water condensing capacity and evaporator

A method for preparing an evaporator for reducing water condensing capacity, comprising steps of:

• step A:
• selecting fins:
• selecting a corresponding number of fins based on a performance need of a known size of the evaporator, stamping multiple bumps on each of the fins, and forming first through holes in the bumps;
• step B:
• stacking:
• aligning and successively stacking the corresponding number of fins, with a detachable backing plate provided between every two adjacent fins, making one surface of the backing plate abut against a bump and another surface of the backing plate abut against a surface of a fin that facing away from the bump, and forming second through holes on the backing plates at positions corresponding to the first through holes;
• step C:
• arranging tubes:
• selecting copper tubes same in number as the number of the first through holes on a single fin, and making the copper tubes pass through the first through holes and the second through holes to pass through the fins;
• and
• step D:
• expanding tubes:
• sealing one end of each of the copper tubes, conveying a liquid medium having a pressure of 6 to 10 MPa into the copper tube from the other end of the copper tube by a medium conveying device, and maintaining the pressure for 20 to 100 s after the pressure in the copper tubes reaches a set range, so that the copper tubes are expanded in outer diameter to be in interference fit with the first through holes.