---
title: "Cooling Towers: Navigating Efficiency and Sustainability in Industrial Cooling"
description: Learn how cooling tower owners can improve efficiency, manage water and energy use, extend equipment life, and build a more sustainable cooling strategy.
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---

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 Mar 14, 2025, 3:46:34 PM

# Cooling Towers: Navigating Efficiency and Sustainability in Industrial Cooling

![Picture of Casey Yurkovitch](https://engineering.obrcoolingtowers.com/hs-fs/hubfs/Blog%20Posts/Casey%20Yurkovitch%20-%20Headshot%20-%20SQ.jpg?width=50&name=Casey%20Yurkovitch%20-%20Headshot%20-%20SQ.jpg) [Casey Yurkovitch](https://engineering.obrcoolingtowers.com/blog/author/casey-yurkovitch)

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Cooling Towers: Navigating Efficiency and Sustainability in Industrial Cooling

19:17

 

*Updated 08/27/2026*

Industrial cooling continues to evolve. Rising energy demand, increased attention to water use, advances in monitoring technology, and greater expectations for equipment reliability are changing how facilities operate and maintain cooling towers.

Cooling towers remain essential across power generation, manufacturing, process industries, commercial HVAC, and the rapidly expanding data center sector. Their fundamental purpose has not changed. Cooling towers reject heat from a process or building system, helping equipment operate within required temperature ranges.

What has changed is the way owners evaluate cooling tower performance.

In 2026, efficiency is not simply about reducing fan horsepower or water consumption independently. The focus is increasingly on optimizing the entire cooling system while balancing energy use, water consumption, thermal performance, reliability, equipment life, and maintenance costs.

For cooling tower owners, inspection, maintenance, water management, controls, component upgrades, and targeted reconstruction can all play an important role in an overall efficiency and sustainability strategy.

 

---

## Energy Efficiency: Looking Beyond Nameplate Performance

Cooling tower efficiency depends on more than the original design specifications of the tower. Actual performance is affected by the condition and operation of the entire system.

Fill condition, water distribution, airflow, fan performance, drive-system condition, fouling, scale, approach temperature, pumping requirements, and controls can all influence how effectively and efficiently a cooling tower rejects heat.

One opportunity for improving efficiency is better fan control. Variable-frequency drives, or VFDs, allow fan speed to more closely match cooling demand rather than relying exclusively on fixed-speed or on/off operation.

VFDs must also be applied correctly. Tower design, fan characteristics, critical speeds, motor compatibility, operating conditions, and manufacturer requirements should all be considered when evaluating a fan-control upgrade.

Energy efficiency should not be viewed as a single-component issue. A new motor or control system cannot compensate for severely plugged fill, poor water distribution, damaged fan components, restricted airflow, or other conditions limiting tower performance.

A more effective approach is to evaluate the cooling tower as a system and identify the conditions preventing it from achieving the required thermal performance efficiently.

 

---

 

## Water Efficiency: Managing Every Gallon

Water conservation remains one of the most important sustainability considerations for evaporative cooling systems.

Cooling towers can represent a significant mechanical-system water use at facilities where they are installed, and total consumption can vary considerably depending on tower capacity, climate, operating conditions, and system design. [\[1\]](https://www.epa.gov/watersense/best-management-practices)

One of the primary measures of cooling tower water efficiency is **cycles of concentration**, or CoC. This compares the concentration of dissolved solids in the recirculating water with the concentration in the incoming make-up water. [\[2\]](https://nepis.epa.gov/Exe/ZyPURL.cgi?Dockey=P100ODFM.TXT)

As water evaporates, dissolved minerals remain behind. Some circulating water must therefore be removed through blowdown and replaced with make-up water to control the concentration of dissolved solids.

Increasing cycles of concentration, where water chemistry and operating conditions allow, can reduce the amount of blowdown and make-up water required. EPA guidance recommends maximizing cycles while recognizing that the appropriate operating range depends on both make-up and circulating-water chemistry.[\[2\]](https://nepis.epa.gov/Exe/ZyPURL.cgi?Dockey=P100ODFM.TXT)

Modern water-management strategies can include:

- Conductivity-based automated blowdown controls
- Make-up and blowdown water metering
- Routine monitoring of water chemistry
- Appropriate chemical-treatment controls
- Side-stream filtration
- Evaluation of alternative make-up water sources
- Regular inspection and cleaning

The appropriate strategy will vary by site. Source-water chemistry, tower materials, process requirements, environmental conditions, treatment programs, and applicable regulations all need to be considered.

 

---

 

## Side-Stream Filtration and Water Quality

Cooling towers continuously move large volumes of air and water, making them susceptible to dirt, debris, suspended solids, biological material, and other contaminants.

These contaminants can contribute to four common treatment concerns: corrosion, scaling, fouling, and microbiological activity.[\[3\]](https://www.energy.gov/cmei/femp/water-efficient-technology-opportunity-side-stream-filtration-cooling-towers)

Side-stream filtration provides one potential method for addressing suspended solids. Rather than filtering the entire circulating-water flow, a side-stream system continuously filters a portion of the recirculating water.

The U.S. Department of Energy’s Federal Energy Management Program identifies several potential benefits of side-stream filtration, including reduced fouling and scaling, potential water and energy savings, reduced chemical use, lower operation and maintenance costs, and extended equipment life. [\[3\]](https://www.energy.gov/cmei/femp/water-efficient-technology-opportunity-side-stream-filtration-cooling-towers)

By reducing suspended solids, filtration can also help some systems increase cycles of concentration and reduce the amount of water required for blowdown. The actual water and energy savings depend on system configuration and operating conditions.[\[3\]](https://www.energy.gov/cmei/femp/water-efficient-technology-opportunity-side-stream-filtration-cooling-towers)

Side-stream filtration does not eliminate the need for appropriate water treatment. Cooling systems, environmental conditions, and make-up water quality vary considerably from one location to another. DOE recommends evaluating filtration requirements for the individual system and involving a water-treatment specialist as appropriate. [\[3\]](https://www.energy.gov/cmei/femp/water-efficient-technology-opportunity-side-stream-filtration-cooling-towers)

 

---

 

## Smart Monitoring and Condition-Based Maintenance

Advances in monitoring technology are giving cooling tower owners greater visibility into equipment operation and condition.

Depending on the tower and application, facilities may be able to monitor and trend parameters such as:

- Fan and motor vibration
- Bearing condition
- Gearbox condition
- Motor load
- Supply and return water temperatures
- Conductivity
- Make-up and blowdown water consumption
- Chemical-treatment conditions
- Fan speed
- Basin levels
- Other mechanical and thermal performance indicators

The value is not simply collecting more data. The value comes from establishing normal operating conditions and recognizing meaningful changes.

A developing vibration trend, increasing motor load, deteriorating thermal performance, unusual water consumption, or changing water chemistry can provide an indication that a cooling system requires further investigation.

This condition-based approach can help owners identify developing problems and address them during planned maintenance windows rather than waiting for equipment failure.

Technology does not replace physical inspection. Monitoring and inspection complement each other. Operating data can help identify where to investigate, while an experienced cooling tower inspection can reveal structural, mechanical, water-distribution, fill, and other conditions that instrumentation alone may not identify.

 

---

## Water Quality, Legionella Risk, and Responsible Operation

Water management is not only an efficiency issue. It is also an important operational and public-health responsibility.

Cooling towers can provide conditions that support Legionella growth and spread if systems are not properly managed. The CDC identifies sediment and biofilm, temperature, water age, and disinfectant residual as key factors affecting Legionella growth in cooling towers.[\[4\]](https://www.cdc.gov/control-legionella/php/toolkit/cooling-towers-module.html)

Current CDC guidance also emphasizes scale and corrosion control, system cleaning, automated disinfectant treatment and monitoring, automated blowdown, avoidance of stagnant areas, and the use of a water management program to establish and track operation and maintenance activities.[\[4\]](https://www.cdc.gov/control-legionella/php/toolkit/cooling-towers-module.html)

The CDC recommends that cooling towers be cleaned and disinfected according to manufacturer recommendations and calls for offline disinfection and cleaning at least annually.[\[4\]](https://www.cdc.gov/control-legionella/php/toolkit/cooling-towers-module.html)

Scale, corrosion, sediment, and biological growth should therefore be viewed as more than routine maintenance concerns. They can affect equipment condition, water-treatment effectiveness, system operation, and biological control.

A comprehensive cooling tower water management program should address the specific tower, system configuration, operating conditions, water chemistry, and applicable requirements.

Regular physical inspection can support that program by identifying conditions such as excessive deposits, damaged fill, plugged nozzles, deteriorated components, and areas that may contribute to poor water distribution or stagnation.

 

---

## Repair, Retrofit, or Replace?

One of the most important questions facing cooling tower owners is not necessarily:

**“What new cooling tower should we buy?”**

A better first question may be:

**“What condition is our existing cooling tower actually in?”**

A cooling tower consists of many systems and components with different service lives. Structural members, fill, drift eliminators, nozzles, fan assemblies, gearboxes, driveshafts, motors, distribution systems, louvers, casing, and other components do not necessarily deteriorate at the same rate.

That creates opportunities to restore or improve performance without automatically replacing an entire cooling tower.

Depending on the tower’s condition, repair and improvement opportunities may include:

- Fill replacement
- Drift eliminator replacement
- Nozzle and water-distribution repairs or upgrades
- Fan and mechanical-system repairs or upgrades
- VFD and control improvements
- Structural repairs
- Casing and louver repairs
- Basin repairs
- Filtration improvements
- Water-treatment and monitoring improvements
- Partial or complete cooling tower reconstruction

This is where a [detailed cooling tower inspection](https://engineering.obrcoolingtowers.com/inspections) becomes particularly valuable.

An inspection can help determine whether deterioration is isolated to individual components or represents a larger structural, mechanical, or performance issue. That information gives owners a better foundation for deciding whether to maintain, repair, upgrade, reconstruct, or ultimately replace the tower.

Extending the useful life of an existing cooling tower through properly planned repairs and reconstruction can also support sustainability goals by maximizing the value of existing infrastructure and avoiding unnecessary replacement when an existing tower can still be effectively restored.

 

---

 

## Data Centers and a Rapidly Changing Cooling Landscape

One of the most significant developments affecting cooling infrastructure in 2026 is the rapid growth of data centers.

Artificial intelligence, cloud computing, and other computing-intensive applications are creating substantial new demand for electricity and heat rejection.

Lawrence Berkeley National Laboratory’s **United States Data Center Energy Usage Report: 2025 Update**, published in June 2026, estimates that data centers could account for approximately **11.8% of total U.S. electricity consumption by 2030**. The report’s modeled scenarios put the potential range between **9.5% and 15.3%** of total U.S. electricity consumption.[\[5\]](https://eta-publications.lbl.gov/publications/united-states-data-center-energy-2025)

That projected growth makes cooling-system efficiency increasingly important.

Data centers also illustrate a broader challenge facing cooling-system owners. Energy consumption, water consumption, thermal performance, reliability, and local resource availability cannot always be optimized independently.

There is no single cooling strategy that will produce the best result for every facility.

Local climate, water availability, energy costs, facility loads, operating requirements, equipment design, and existing infrastructure all influence the most appropriate cooling strategy.

 

---

 

## The Water and Energy Balance

For years, energy efficiency and water conservation were often discussed as separate sustainability goals.

Increasingly, they need to be evaluated together.

Evaporative cooling uses water as part of the heat-rejection process. Dry cooling can reduce direct water consumption, but it introduces different thermal-performance, energy, operating, and capital considerations.

Hybrid approaches provide another option by combining wet and dry heat-rejection strategies or changing operating modes according to conditions.

The appropriate solution depends on the facility.

A site in a water-constrained region may place greater emphasis on reducing water consumption. Another facility may prioritize electrical efficiency or maximum cooling capacity. A critical industrial process may place reliability above both.

The goal should be to understand these tradeoffs and select a strategy that best meets the facility’s performance, reliability, cost, water, and energy objectives.

 

---

 

## What Cooling Tower Owners Should Be Watching

Several areas deserve particular attention as industrial cooling continues to evolve.

 

### Water Efficiency

Facilities should continue evaluating opportunities to optimize cycles of concentration where water chemistry permits, improve blowdown control, monitor water consumption, reduce unnecessary losses, and improve overall water-quality management.[\[1\]](https://www.epa.gov/watersense/best-management-practices)[\[2\]](https://nepis.epa.gov/Exe/ZyPURL.cgi?Dockey=P100ODFM.TXT)

EPA WaterSense continues to highlight cooling towers as an important opportunity for commercial and institutional water management. In February 2026, WaterSense also presented updated educational material covering cooling tower metering, cycles of concentration, best practices, advanced treatment, and potential savings associated with treatment upgrades.[\[6\]](https://www.epa.gov/watersense/webinars)

 

### Condition-Based Maintenance

Connected monitoring and operating-data analysis can supplement traditional inspection and preventive maintenance by helping owners identify changing equipment conditions and investigate potential problems earlier.

 

### Existing Asset Optimization

Repair, component replacement, controls upgrades, and reconstruction can provide alternatives to premature cooling tower replacement. Understanding the actual condition of the existing asset is an important first step in making the right maintenance and capital decisions.

 

### Water Management and Biological Control

Proper cleaning, treatment, monitoring, documentation, and system operation remain critical components of responsible cooling tower ownership. CDC guidance emphasizes ongoing control of sediment, biofilm, temperature, water age, disinfectant residual, scale, and corrosion as part of Legionella risk management.[\[4\]](https://www.cdc.gov/control-legionella/php/toolkit/cooling-towers-module.html)

 

### Water and Energy Optimization

Cooling decisions increasingly require owners to consider water and energy together. The best solution for one facility may not be the best solution for another.

 

### Data Center Cooling Demand

Growth in AI and digital infrastructure is creating significant new electricity and cooling demand. LBNL’s latest projections demonstrate the potential scale of U.S. data center electricity consumption by the end of this decade.[\[5\]](https://eta-publications.lbl.gov/publications/united-states-data-center-energy-2025)

 

### System-Level Performance

Cooling tower performance is best evaluated as part of an interconnected thermal system rather than solely by looking at individual components. Water distribution, airflow, heat-transfer surfaces, mechanical equipment, controls, water treatment, and maintenance all contribute to overall performance.

 

---

 

## Building a More Efficient and Sustainable Cooling Strategy

Cooling towers will remain critical infrastructure across power generation, manufacturing, process industries, HVAC, data centers, and many other applications.

Achieving greater efficiency and sustainability, however, does not necessarily mean replacing existing equipment with the newest technology.

Often, the first step is understanding how the existing cooling tower is actually performing and what condition it is in.

A thorough inspection can reveal deteriorated components, restricted airflow, poor water distribution, damaged fill, mechanical issues, structural deterioration, and other conditions that can affect thermal performance and reliability.

Combined with effective water management, appropriate controls, preventive maintenance, and targeted upgrades, those findings can help owners make informed decisions about their cooling assets.

At **OBR Cooling Towers**, we believe cooling tower efficiency begins with understanding the condition of the tower and identifying the right solution for the application, whether that means [maintenance](https://engineering.obrcoolingtowers.com/service), [repair](https://obrcoolingtowers.com/repair-and-rebuild/), [component replacement](https://engineering.obrcoolingtowers.com/parts), performance improvements, [reconstruction](https://obrcoolingtowers.com/repair-and-rebuild/), or replacement.

As energy and water demands continue to evolve, the most sustainable cooling tower may not always be a new tower. It may be an existing tower that is properly inspected, maintained, upgraded, and optimized to perform reliably for years to come.

 

---

#### Sources & Further Reading

**\[1\] U.S. Environmental Protection Agency, WaterSense: Best Management Practices**  
Current EPA resources covering commercial and institutional water management, including mechanical systems and cooling towers.  
[https://www.epa.gov/watersense/best-management-practices](https://www.epa.gov/watersense/best-management-practices)

**\[2\] U.S. Environmental Protection Agency, WaterSense at Work: Best Management Practices for Commercial and Institutional Facilities**  
EPA guidance covering cooling tower water use, cycles of concentration, make-up water, blowdown, water chemistry, and water-efficiency practices.  
[https://nepis.epa.gov/Exe/ZyPURL.cgi?Dockey=P100ODFM.TXT](https://nepis.epa.gov/Exe/ZyPURL.cgi?Dockey=P100ODFM.TXT)

**\[3\] U.S. Department of Energy, Federal Energy Management Program: Water-Efficient Technology Opportunity, Side-Stream Filtration for Cooling Towers**  
DOE guidance on side-stream filtration, fouling, scaling, water and energy savings, chemical use, maintenance, and equipment life.  
[https://www.energy.gov/cmei/femp/water-efficient-technology-opportunity-side-stream-filtration-cooling-towers](https://www.energy.gov/cmei/femp/water-efficient-technology-opportunity-side-stream-filtration-cooling-towers)

**\[4\] Centers for Disease Control and Prevention: Controlling Legionella in Cooling Towers**  
CDC guidance addressing cooling tower water management, scale, corrosion, sediment, biofilm, cleaning, disinfectant monitoring, blowdown, and Legionella control.  
[https://www.cdc.gov/control-legionella/php/toolkit/cooling-towers-module.html](https://www.cdc.gov/control-legionella/php/toolkit/cooling-towers-module.html)

**\[5\] Lawrence Berkeley National Laboratory: United States Data Center Energy Usage Report, 2025 Update**  
Published June 2026. The report provides updated estimates of U.S. data center electricity demand and projections through 2030.  
[https://eta-publications.lbl.gov/publications/united-states-data-center-energy-2025](https://eta-publications.lbl.gov/publications/united-states-data-center-energy-2025)

**\[6\] U.S. Environmental Protection Agency, WaterSense: All About Cooling Towers Webinar**  
February 25, 2026. WaterSense educational material covering cooling tower operation, cycles of concentration, metering, water-management best practices, and advanced treatment.  
[https://www.epa.gov/watersense/webinars](https://www.epa.gov/watersense/webinars)

[Cooling Tower Maintenance](https://engineering.obrcoolingtowers.com/blog/tag/cooling-tower-maintenance), [Cooling Towers](https://engineering.obrcoolingtowers.com/blog/tag/cooling-towers), [Cooling Tower Efficiency](https://engineering.obrcoolingtowers.com/blog/tag/cooling-tower-efficiency), [Energy Efficiency](https://engineering.obrcoolingtowers.com/blog/tag/energy-efficiency), [Water Management](https://engineering.obrcoolingtowers.com/blog/tag/water-management), [Industrial Cooling](https://engineering.obrcoolingtowers.com/blog/tag/industrial-cooling), [Sustainability](https://engineering.obrcoolingtowers.com/blog/tag/sustainability)

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