In a forced draft cooling tower, water is cooled from 95 to 80°F by exposure to air with a wet bulb temperature of 70°F. In this case, the________________?

A. Range is 15°F
B. Approach is 10°F
C. Both A. & B.
D. Neither A. nor B.

Explanation:
Temperature range (T1 – T2) = 15°F
Temperature approach (T2 – tw) = 10°F
Wet-bulb temperature tw = 70°F