What do data center chillers do in a data center?
Provides cold water when the outside air cannot do the job. A data-center chiller uses a refrigerant cycle to remove heat from a water loop when outside air or evaporative equipment cannot reach the required temperature. Depending on design, it connects to cooling towers, dry coolers, air handlers, rear-door units, coolant distribution units, pumps, electrical distribution, and plant controls. Chillers provide predictable low-temperature water, but compressor energy, refrigerant management, maintenance, noise, and minimum-load behavior shape annual cost. Published efficiency at one full-load condition does not represent a year of changing weather and compute load. Fouled heat exchangers, lost condenser flow, high ambient temperature, a refrigerant fault, or a power event can reduce capacity at the worst time. Starting current and restart sequence also matter after an outage. Operators need water and refrigerant treatment, oil and vibration checks where applicable, tube or coil cleaning, leak reporting, and tested plant staging. Procurement should use an hourly load and weather model, with efficiency and capacity at full and partial load, required water temperatures, pump and fan energy, and the intended redundancy state. Ask for refrigerant type and charge, turndown, sound, heat recovery options, controls, service access, spares, local technicians, and end-of-life refrigerant plans. Warmer liquid-cooling loops may allow many chiller-free hours, but only a site model can quantify them.