The invention relates to a method and a device for controlling heat exchange temperature, collecting
condensed water and cleaning an air conditioner. A
heat exchanger in the air conditioner is utilized for condensing
water vapor in the air conditioner into liquid-state water;
dirt attached to the surface of the
heat exchanger is cleared away; the surface temperature, used for condensation, of the
heat exchanger is determined according to the current environment temperature and the current environment
humidity, and is used as the expected temperature; the temperature of the heat exchanger is regulated and is maintained at the expected temperature through regulating the rotating speed of a compressor and the rotating speed of a
fan in the air conditioner. Through analyzing the influence of the environment temperature and the environment
humidity on the
dew point, the optimum temperature of the heat exchanger in the current environment is determined, and sufficient
condensed water is obtained for clearing dust and
dirt on the surface of the heat exchanger. When the practical temperature of the heat exchanger is not consistent with the optimum temperature, the rise or the reduction of the surface temperature of the heat exchanger is realized through regulating the rotating speed of the compressor and the rotating speed of the fan, the surface temperature of the heat exchanger is maintained at the determined optimum temperature, and the
water vapor in the air conditioner is condensed into liquid-state water.