1. First, use a psychrometric chart to determine the theoretical minimum temperature (wet bulb) you can get with the cooling tower at your location. In practice, though, the minimum you can achieve is 4—5°F above the wet bulb temperature. (This is called approach.) Because you have high relative humidity of 90 at ambient of 95°F, psychrometric charts show wet bulb close to 95°F. Compare the temperature of cooling water coming out of the cooling tower with the wet bulb temperature. If this temperature is close, your cooling tower is functioning the best it can. However, if the temperature is much higher (say, approach is 10—15°F), you can improve the operation of the cooling tower.
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