COOLING APPARATUS USING BOILING AND CONDENSING REFRIGERANT

The cooling device of the present invention includes a casing divided into a first fluid passage and a second fluid passage by a fluid separation plate; a heat exchanger disposed to pass through the fluid separation plate, for receiving heat from high-temperature air flowing in the first fluid passage and for radiating the heat to the outside air flowing in the second fluid passage; an inside fan for blowing the high temperature air in the first fluid passage; an outside fan for blowing the outside air to the second fluid passage; and a thermistor for sensing a temperature of the high temperature air flowing in the first fluid passage. A rotational speed of each of the fans of the inside fan and the outside fan is variably controlled in response to a temperature detected by the thermistor with the controller. In this way, it is possible to cooling an interior of a closed box and to reduce the consumed electric power.