METHOD OF PRESERVING HEAT EXCHANGE SURFACE AND METHOD OF COOLING MOIST AIR

[Problem] To provide a method of preserving heat exchange surface which can provide a maintenance-free heat exchange surface by preventing the transfer of mass on a heat exchange surface that has a large temperature differential with the surroundings. [Solution] This method of cooling moist air through a heat exchange surface is characterized by suppressing the formation of dew and frost on a heat exchange surface by involving : a step for preparing a carrier (C) which has a heat conduction ratio higher than that of the moist air if the air temperature in a temperature boundary layer (BL), which is determined in accordance with the temperature and airflow on the heat exchange surface, is below the dew-point under the condition the air temperature in the temperature boundary layer is above 0°C, or below the freezing-point under the condition the air temperature in the temperature boundary layer is below 0°C, said carrier being arranged within the temperature boundary layer (BL) and on the heat exchange surface, which is in contact with moist air and is used for cooling, and a step for removing moisture from the air by condensing or sublimating water vapor in the moist air on the surface of the carrier (C) by arranging the carrier (C) opposite of the heat exchange surface and within temperature boundary layer (BL).