In urban and HVAC engineering, 7.5 meters is a standard regulatory minimum for the separation between a cooling tower and building openings. 機電工程署 Health & Safety:
The primary function of a 7.5m cooling tower is to cool water that has been heated by industrial processes or air conditioning condensers. The process begins at the top, where hot water is distributed through a spray header. As the water falls, it passes through "fill" material, which breaks the liquid into smaller droplets to increase surface area. Simultaneously, large axial fans—often mounted at the top in a crossflow or counterflow configuration—pull ambient air through the tower. This contact causes a small portion of the water to evaporate, which pulls heat away from the remaining liquid, effectively lowering its temperature before it is recirculated. cooling tower 7.5m