The invention discloses a
dew point temperature controlling method and device. The method comprises the following steps that the indoor environment temperature, the indoor environment
humidity and the cold surface temperature are detected in real time, and the
dew point temperature is calculated according to the indoor environment temperature and the indoor environment
humidity; under a refrigerating mode, if the indoor environment
humidity is larger than or equal to a first humidity threshold, a fan is only started to conduct dehumidification till the indoor environment humidity is smaller than a second humidity threshold or the indoor environment temperature is lower than a first set temperature, the fan is closed, wherein the second humidity threshold is smaller than the first humidity threshold; and if the indoor environment humidity is smaller than the first humidity threshold, a
capillary network cold water valve and the fan are controlled to be started or closed according to the indoor environment temperature, a first temperature return difference compensating section, the
dew point temperature and the cold surface temperature, so that the indoor environment temperature is adjusted to be maintained within the first temperature return difference compensating section. By means of the
dew point temperature controlling method, unified control over a refrigerating
system and a dehumidifying
system can be achieved, the dew formation of a
capillary network is effectively avoided, and the refrigerating requirement under a high-temperature and high-humidity environment is not affected.