What is the main advantage of a forced-draft cooling tower over a natural-draft cooling tower?

• A. Smaller tower size
• B. Lower maintenance
• C. Higher energy consumption
• D. More complex to operate

Answer: (A)

The main idea is that forced-draft cooling towers can be built smaller because air is moved through the fill by a mechanical fan rather than relying on wind to pull it through. When a fan forces air through the fill, the system doesn’t need tall chimneys or large natural-draft features to create the necessary airflow. This lets the tower have a smaller footprint and height, and it can often be placed closer to the equipment it serves or even indoors, which is a practical space-saving benefit.

Lower maintenance isn’t guaranteed because the system adds a fan and motor with moving parts that require upkeep. Higher energy consumption isn’t an inherent advantage: the fan adds energy use, but the overall efficiency and size benefits can offset that in some designs. Being more complex to operate also isn’t inherent; forced-draft systems are generally straightforward to run, with the main edge being the compact size.