●Wet bulb temperature is an important factor in performance of evaporative water cooling equipment. It is a controlling factor from the aspect of minimum cold water temperature to which water can be cooled by the evaporative method. Thus the wet bulb temperature of the air entering the cooling tower determines operating temperature levels throughout the plane. Theoretically a cooling tower will cool width to the entering wet bulb temperature when operating without a heat load.

●Evaporative cooling of water can be theoretically cooled down to air’s wet bulb temperature.

Hence, the correct option is (C).