Cooling towers are quietly one of the largest water and energy consumers on industrial sites, and pressure to run them more efficiently is rising from both utility costs and tightening net-zero commitments. The good news is that most existing towers carry meaningful efficiency headroom that can be unlocked through smarter operation, targeted component upgrades, and proper servicing, without a full replacement. Whether you operate a Carter Environmental tower, a legacy Visco unit, or equipment from another manufacturer, the levers are the same.
Where Do Cooling Towers Actually Lose Water and Energy?
You cannot reduce what you have not mapped. On the water side, evaporative cooling towers lose water in three places:
- Evaporation: The cooling mechanism itself. Mostly unavoidable.
- Drift: Water carried into the atmosphere by the airstream. Reducible through proper drift eliminator condition.
- Blowdown: Deliberate discharge to control dissolved solids. The single largest water-saving lever.
On the energy side, losses come from fan and motor operation, pump load, and degraded heat transfer caused by fouled fill packs or scale on heat exchange surfaces. Ageing belt-driven fans and oversized motors running flat-out regardless of cooling demand account for a disproportionate share of the bill.
How Can You Reduce Cooling Tower Water Consumption?
The largest single water lever is increasing cycles of concentration (CoC), which controls how often the system flushes dissolved solids before fresh makeup water replaces them. A CIBSE Journal analysis of UK commercial buildings found that optimised treatment combined with non-potable makeup water can deliver a 24% saving on potable water consumption. Our cooling tower water treatment breakdown walks through the CoC chemistry in detail.
Beyond treatment, the practical levers are:
- Side-stream filtration: Removes suspended solids continuously, allowing higher CoC without scale or biological growth.
- Drift eliminators: Replacing degraded eliminators cuts drift losses, with modern units reducing drift to less than 0.001% of circulating flow.
- Makeup water quality: Pre-treating makeup or switching to non-potable sources such as rainwater or treated greywater drops potable demand significantly.
- Tower material: Carter Environmental stainless-steel construction handles higher CoC without accelerated corrosion, reducing forced blowdown.
How Can You Cut Cooling Tower Energy Use?
UK industry uses around 17% of the country’s total end energy and contributes over 20% of national carbon emissions. Carbon Trust analysis funded by BEIS found that up to 40% of that energy is lost to equipment inefficiency, mechanical limitations, and heat loss. Cooling towers are a textbook example of where that headroom sits.
The practical energy levers:
- Fan and motor upgrades: Ageing belt-driven units lose efficiency through belt slip and gearbox drag. Direct-drive axial designs, including the Carter SAN and BUC Series, remove those losses entirely.
- Variable frequency drives: Match fan speed to actual cooling demand instead of running flat-out. Savings on partially loaded towers are substantial.
- Free cooling and adiabatic modes: Our WABC closed-circuit coolers run dry through cooler periods and switch to evaporative mode only when ambient conditions require it.
- Fill pack condition: Fouled or collapsed fill reduces heat transfer and forces the tower to work harder to maintain output.
- BMS control logic: Many older towers run flat-out regardless of load. Modern controls match cooling output to live demand.
When Does Refurbishing or Upgrading Your Cooling Tower Make Commercial Sense?
If the tower structure is sound but components have degraded, cooling tower refurbishment usually beats replacement on cost, lead time, and disruption. Drift eliminator replacement, fill pack renewal, fan and motor upgrades, and structural recoating can extend tower life by a decade and deliver step-changes in water and energy performance.
Replacement becomes the right call when component upgrades stop returning meaningful gains; the structure has reached end of life, or capacity no longer matches site demand. At that point, modern Carter Environmental cooling towers are designed for higher efficiency from day one, with stainless steel construction, direct-drive fans where appropriate, and adiabatic options for energy-sensitive sites. Both ranges, plus legacy Visco cooling towers, are manufactured in our Birmingham facility from fully recyclable materials.
The decision is a payback conversation, not a like-for-like swap.
Cut Your Cooling Tower’s Water and Energy Footprint With Franklin Hodge
Our cooling tower servicing team surveys existing equipment, identifies the levers that will deliver the highest return, and builds a maintenance and upgrade plan around them. We service all cooling towers under the Carter Environmental and Visco ranges and can assess legacy towers from other manufacturers, including drone-based external inspections for sites where safe working at height is restricted. Send us your site details and we’ll arrange a survey and a written recommendation.
