| 摘要 |
A dew preventing mechanism prevents the formation of dew on the grilles of an air discharge port of a room air conditioner by activating a heater which heats the grilles in response to the sensing of certain dew-forming conditions. The air conditioner includes thermistors for sensing the temperatures of incoming room air and outgoing cooled air, respectively, and a hygrometer for sensing the humidity of incoming room air. Signals proportional to those temperatures and humidity are sent to a control device which calculates the dew point of the incoming room air and compares the humidity of the incoming air with a reference humidity. When the outgoing air temperature is less than the dew point, and/or the incoming air humidity exceeds the reference humidity, the heater is actuated.
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