Method for checking quality of heat exchanger

A method for checking quality of a heat exchanger comprising:

• performing a liquid pressure test for the heat exchanger including a first flow path and a second flow path adjacent to the first flow path by filling the first flow path and the second flow path with a liquid in a pressurized state;
• discharging the liquid from the first flow path and the second flow path;
• promoting evaporation of the liquid remaining in the first flow path and the second flow path by reducing pressure inside each of the first flow path and the second flow path using a vacuum pump;
• and
• checking to determine whether liquid remains in the first flow path and the second flow path by filling each of the first and second flow paths with a gas having a reference dew point below a predetermined value, causing the gas to flow out of each of the first and second flow paths, and comparing a dew point of the gas flowing out to the reference dew point.

A method for checking quality of a heat exchanger comprising:

• performing a liquid pressure test for the heat exchanger including a first flow path and a second flow path adjacent to the first flow path by filling the first flow path and the second flow path with a liquid in a pressurized state;
• discharging the liquid from the first flow path and the second flow path;
• and
• promoting evaporation of the liquid remaining in the first flow path and the second flow path by reducing pressure inside each of the first flow path and the second flow path using a vacuum pump;
• wherein the promoting evaporation of the liquid includes a first step of reducing pressure inside the first flow path and at the same time heating the heat exchanger, and a second step of reducing pressure inside the second flow path and at the same time heating the heat exchanger, and
• wherein the second step is performed before or after the first step.