What cooling towers use temperature differences inside and outside the stack to facilitate air movement?
A) Induced draft tower
B) Forced draft tower
C) Closed circuit cooling tower
D) Natural draft tower
Answer: D
Explanation: A) Incorrect. Induced draft towers have fans at the top of the tower that pull air through the equipment components.
B) Incorrect. Forced draft towers have fans or blowers at the bottom of the tower that force air through the equipment.
C) Incorrect. Closed circuit cooling towers use a heat exchange coil through which the working fluid passes and over which water is sprayed.
D) Correct. Natural draft towers use temperature differences inside and outside the stack to facilitate air movement.
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