What are two types of cooling towers?

The answer identifies two distinct categories of cooling towers: natural draft and mechanical draft cooling towers.

Natural draft cooling towers operate based on the natural convection of air. They utilize the difference in temperature between the warm air inside the tower and the cooler ambient air outside to create a flow of air, allowing for evaporative cooling without the need for mechanical assistance. This type is often characterized by a taller structure, which enhances the buoyancy effect and air circulation.

On the other hand, mechanical draft cooling towers use fans, either forced or induced draft, to circulate air through the tower. These fans actively draw air across the fill material, improving heat transfer by enhancing the airflow, regardless of external temperature conditions. This type of cooling tower is generally more adaptable and can be designed to fit specific site conditions and cooling requirements.

The other options, while they mention terms associated with cooling methods, do not accurately define the main categories of cooling towers recognized in engineering. For example, open loop and closed loop refer more specifically to the system type of cooling (how the water is circulated through the system) rather than the cooling tower design itself. Similarly, forced air and gravity feed pertain more to how air or water is moved within a system, which does not encapsulate the