What do cooling towers do in a data center?
Sheds the site's heat by evaporating water. A cooling tower exposes warm condenser or facility water to moving air and rejects heat by evaporating a small part of the flow. It can approach outdoor wet-bulb temperature, which is lower than dry-bulb temperature in unsaturated air. Towers interface with chillers or heat exchangers, condenser pumps, make-up water, treatment and filtration, drains, electrical feeds, and plant controls. They can deliver strong hot-weather performance, but evaporation, drift, and blowdown consume water and concentrate dissolved minerals. Scale, corrosion, biological growth, blocked fill, fan or pump faults, icing, plume, and poor chemistry can reduce capacity or create health and compliance risks. Operators need continuous water management, legionella controls, cleaning, inspection, winter procedures, and records. Procurement should model hourly heat rejection and water use with site wet-bulb weather, source-water chemistry, cycles of concentration, blowdown limits, and the intended load profile. Require thermal performance and fan power at design and partial load, drift rate, plume and sound data, materials, filtration, access, redundancy, and code compliance. Confirm where make-up water comes from, what pretreatment it needs, where blowdown goes, and who holds permits. Compare tower, dry, and hybrid options on annual energy, peak demand, potable water, chemical use, maintenance, and community constraints, not cooling capacity alone.