UV Water Treatment for Data Centre Cooling Systems: Protecting Uptime and Infrastructure

Categories: Armour, Armour X, Blog, Commercial, Data Centre, HWC-Series - Commercial, MPX-Series, P-Series, S-Series, T-Series, X-Series

Data centres run on water. Cooling systems dissipate the heat load from servers and network equipment, and the reliability of those cooling systems is directly linked to uptime. Water quality problems including Legionella growth, biofilm fouling, scale deposition and microbial-induced corrosion are common causes of cooling system degradation and unexpected downtime.

UV water treatment provides continuous microbial control in data centre cooling systems without the corrosion and environmental issues associated with high chemical biocide dosing.

Water Quality Risks in Data Centre Cooling

Data centre cooling infrastructure includes cooling towers, evaporative condensers, closed circuit coolers and chilled water distribution systems. Each presents specific water quality management challenges:

  • Cooling towers: open recirculating systems with warm water, aerosol generation and nutrient-rich conditions that favour Legionella and biofilm growth.
  • Closed loop chilled water circuits: lower microbial risk but susceptible to biofilm formation and microbiologically influenced corrosion at low flow zones.
  • Make-up water quality: chloramine in municipal supply water attacks cooling system components if not removed before entry.

Data Centre Cooling Application

Warm Water and Legionella

UV Treatment in Cooling Tower Systems

UV disinfection is installed on cooling tower make-up water lines and on the recirculating water stream to continuously reduce microbial populations. The result is lower Legionella risk, reduced biofilm formation in tower fill and basin, and reduced overall chemical biocide demand.

For hyperscale and enterprise data centres where Legionella Water Safety Plans are a compliance requirement, UV disinfection provides a documented, continuously monitored control measure that supports audit and regulatory requirements.

Reducing biocide dose also delivers operational benefits in large cooling systems: lower chemical procurement and handling costs, reduced corrosion from oxidising biocides, and lower environmental load in blowdown water.

Chlorine and Chloramine Destruction

UV for Closed Loop Water Treatment

Closed circuit chilled water loops and condenser water systems support biofilm growth that accelerates corrosion and reduces heat transfer efficiency. UV units installed on closed loop bypass streams provide continuous low-level disinfection that suppresses microbial populations and maintains heat transfer performance.

This is a lower-flow, lower-dose application compared to cooling tower treatment, and can use compact inline UV units.

Commercial UV Systems

Frequently Asked Questions

UV is a supplementary measure that works alongside chemical treatment. It reduces overall biocide demand and provides continuous microbial control, but does not replace the scale inhibitors, corrosion inhibitors and conductivity management that chemical treatment programmes provide.

UV is not mandated but is an accepted and increasingly common control measure within Legionella Water Safety Plans required under AS 3666 and state public health regulations. UV Guard can provide system documentation to support Water Safety Plan submissions.

This varies significantly with the scale of the data centre. UV Guard can size systems across the full range, from small edge data centre cooling systems through to hyperscale facility configurations.

Yes. UV photolysis at 254nm is effective for chloramine removal from cooling tower make-up water. Removing chloramine before it enters the cooling system protects components and reduces the formation of other by-products in the recirculating water.

UV units are installed inline on the relevant water streams with UV intensity monitoring connected to building management systems. Alarm outputs notify facilities teams of lamp degradation or failure. Scheduled lamp replacement is incorporated into the preventive maintenance programme. UV Guard service can be coordinated with site maintenance schedules.

Talk to Us About Water Treatment Solutions

Talk to UV Guard about water treatment solutions for your data centre cooling infrastructure.

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Get in touch

Contact our team for expert guidance on selecting the right UV water treatment system, sourcing compatible spare parts, or confirming the correct components for your existing setup. We can also assist with servicing requirements to help maintain performance and long-term reliability.

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