Closed-loop cooling towers, also known as evaporative air coolers or closed cooling towers, involve placing a tubular heat exchanger inside the tower. They ensure cooling efficiency through heat exchange between the circulating air, spray water, and recirculated water. Being closed-loop systems, they guarantee water quality remains unpolluted, effectively protecting the main equipment's efficient operation and extending its lifespan. When outdoor temperatures are low, the spray water system can be shut off to achieve water-saving effects.

With the implementation of national energy-saving and emission-reduction policies and the increasing scarcity of water resources,密闭式冷却塔 has been widely used in industries such as steel metallurgy, power electronics, mechanical processing, and air conditioning systems in recent years.