HUMIDITY CONTROL
strategies evolve. Direct-to-chip and liquid cooling can reduce the dependence on large volumes of cold air at rack level, but they do not remove the need to manage building moisture. Condensation risk, air-side equipment protection, electrical rooms and ancillary spaces still require a controlled envelope.
high-humidity regions. It found that the technology was eff ective across all three, with the strongest benefi t in dry climates, and reported average annual power usage eff ectiveness below 1.3 with annual operating cost savings exceeding 30% in the simulated urban data centres. This does not mean evaporative or adiabatic cooling is a universal replacement for mechanical cooling. UK conditions, with comparatively variable humidity, often favour hybrid HVAC designs where adiabatic cooling reduces compressor run hours and mechanical cooling provides back-up when ambient conditions demand it. The engineering challenge is to integrate these elements so that temperature, humidity, ventilation and controls work together rather than against each other. Humidity control is also changing as data centre cooling
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Humidity control from the outset The best results come when humidity is considered at design stage rather than treated as a later correction. Humidity levels must be viewed as a core climate-control variable that infl uences cooling load, plant selection, ventilation design, controls strategy and long-term effi ciency. Managed well, it can help heating and cooling systems run with lower energy input, reduced carbon impact and better lifetime performance. Managed badly, it can drive overcooling, reheat, instability and wasted capacity.
Partners in humidity control Klima-Therm has recently partnered with Fisair to deliver its range of humidifi ers and dehumidifi ers to the British market. Designed for high-pressure applications, including food production, data centres, pharmaceutical storage, healthcare and various industrial manufacturing processes, Fisair’s products fi t well within Klima-Therm’s existing range of climate control solutions.
'By using evaporation to absorb
heat from the airstream, adiabatic systems can deliver cooling with far less electrical input than mechanical refrigeration.'
www.acr-news.com • October 2026 23
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