How Does a Cooling Tower Work? A Complete Guide for Commercial HVAC Systems

Cooling towers play an important role in many commercial and industrial HVAC systems. They help remove unwanted heat from a building’s cooling system and reject that heat into the atmosphere, allowing the system to continue operating efficiently.

At Inline Sales & Services Ltd., we work with commercial HVAC contractors, building operators, and mechanical companies to supply and install cooling towers, pumps, and related equipment throughout the Lower Mainland and Fraser Valley.

Whether you are replacing an aging cooling tower, upgrading a building’s cooling system, or dealing with pump problems, our team can help with the equipment selection and installation.

What Is a Cooling Tower?

A cooling tower is a heat-rejection device used to remove heat from water that has been circulated through a building’s cooling system.

In a typical commercial HVAC application, a chiller produces chilled water that is used to cool the building. The chiller itself generates heat that must be removed. A cooling tower is commonly used as part of the condenser-water system to reject that heat outdoors.

The basic process is:

Building → Chiller → Condenser Water → Cooling Tower → Heat Released to Atmosphere

Cooling towers are commonly found on:

• Office buildings

• Apartment and condominium buildings

• Hospitals and healthcare facilities

• Hotels

• Shopping centres

• Industrial facilities

• Institutional buildings

• Large commercial HVAC systems

How Does a Cooling Tower Work?

A cooling tower uses a combination of water, airflow, and evaporation to remove heat.

Warm condenser water leaves the chiller and is pumped to the cooling tower. Inside the tower, the water is distributed over a fill material that increases the surface area available for heat transfer.

At the same time, fans move air through the tower.

As the warm water comes into contact with the moving air, a small amount of the water evaporates. This evaporation removes heat from the remaining water, lowering its temperature.

The cooled water then collects in the tower’s basin and is pumped back to the chiller.

The cycle continues as long as the HVAC system is operating.

The Cooling Tower Process

1. Warm water leaves the chiller

The condenser water absorbs heat from the chiller’s refrigeration process.

2. The condenser-water pump moves the water

A pump circulates the warm water from the chiller to the cooling tower.

3. Water is distributed through the tower

The water is spread across the tower’s fill material.

4. Air moves through the tower

Fans draw or push air through the tower, creating contact between the air and water.

5. Evaporation removes heat

A small portion of the water evaporates, carrying heat away with it.

6. Cooled water returns to the chiller

The cooled condenser water collects in the basin and is pumped back to the chiller to absorb more heat.

This continuous process allows the cooling system to reject heat efficiently.

Why Are Pumps So Important to a Cooling Tower?

A cooling tower cannot operate properly without reliable water circulation.

The condenser-water pumps are responsible for moving water between the chiller and cooling tower. If the pump is improperly sized, worn out, or operating outside its intended duty point, the entire cooling system can be affected.

Common pump problems can include:

• Insufficient water flow

• Excessive energy consumption

• Mechanical seal failures

• Bearing problems

• Cavitation

• Vibration

• Motor failures

• Impeller damage

• Incorrect pump sizing

The right pump needs to provide the required flow and head for the system while operating efficiently and reliably.

At Inline Sales & Services Ltd., we can help identify the correct replacement pump or pump assembly for your cooling tower application.

Cooling Tower Pump Replacement and Upgrades

When an existing cooling tower pump reaches the end of its service life, replacing the pump with the correct equipment is critical.

Simply matching the horsepower or pipe size is not enough.

Pump selection should take into consideration the system’s required flow rate, total dynamic head, operating conditions, piping configuration, motor requirements, and control system.

Depending on the application, we can supply replacement pumps and pump assemblies from leading manufacturers.

We also provide pump repair services when repairing the existing equipment is a better option than replacement.

Supplying and Installing New Cooling Towers

If your existing cooling tower is approaching the end of its useful life, a replacement tower may be the best solution.

Older towers can experience corrosion, damaged fill, deteriorated structural components, fan problems, leaking basins, and declining heat-transfer performance.

Replacing the tower can provide an opportunity to improve the overall reliability and efficiency of the cooling system.

Inline Sales & Services Ltd. can assist with cooling tower equipment supply and installation, including the pumps required to circulate water through the system.

Our experience with commercial pumps and hydronic systems allows us to look at the cooling tower and pumping system as a complete package rather than treating each component separately.

Cooling Tower Maintenance Matters

Regular maintenance is important for keeping a cooling tower operating properly.

Maintenance can include inspection of:

• Pumps and motors

• Mechanical seals

• Bearings

• Impellers

• Fan assemblies

• Fill material

• Spray nozzles

• Water distribution systems

• Tower basin

• Valves and piping

• Vibration and operating conditions

Water treatment is also an important part of cooling tower maintenance. Because cooling towers operate through evaporation, minerals and contaminants can become concentrated in the circulating water. Proper water treatment and maintenance help protect the equipment and maintain system performance.

When Should You Consider Replacing Your Cooling Tower?

There are several signs that a cooling tower may need significant repairs or replacement.

These can include:

Poor cooling performance
The tower may no longer be able to bring condenser water down to the required temperature.

Frequent repairs
If pumps, motors, fans, bearings, or other components are continually failing, replacement may be more economical than continuing to repair the equipment.

Corrosion and deterioration
Structural components, basins, piping, and other components can deteriorate over time.

High operating costs
Older equipment may consume more energy than modern equipment.

Parts availability
As equipment gets older, replacement parts can become increasingly difficult or expensive to obtain.

Major pump problems
A failing condenser-water pump can affect the entire cooling system. In some cases, replacing the pump and upgrading the tower at the same time can provide a more reliable long-term solution.

A Complete Cooling Tower Solution

Replacing a cooling tower is more than simply removing the old equipment and installing a new tower.

The tower, pumps, piping, controls, valves, and other components need to work together as one system.

That’s where experience with commercial HVAC pumping systems makes a difference.

At Inline Sales & Services Ltd., we can help with:

• Cooling tower equipment supply

• New cooling tower installations

• Condenser-water pumps

• Replacement pumps and pump assemblies

• Pump repairs and rebuilding

• Mechanical seals and pump parts

• Pump sizing and equipment selection

• Commercial HVAC pumping applications

• Equipment upgrades and replacements

Our shop also provides pump repair and rebuilding services, giving contractors and building operators another option when equipment can be repaired rather than replaced.

Keeping Your Cooling System Flowing

A properly designed cooling tower and pumping system is essential to maintaining reliable commercial HVAC operation. When the tower can efficiently reject heat and the pumps provide the required flow, the chiller can operate as intended.

Whether you need a new cooling tower, replacement condenser-water pumps, pump repairs, or assistance selecting the right equipment, Inline Sales & Services Ltd. can help.

We serve commercial HVAC contractors, mechanical contractors, building operators, and facility managers throughout Surrey, Vancouver, the Lower Mainland, and the Fraser Valley.

Need a new cooling tower or replacement pump? Contact Inline Sales & Services Ltd. Our team can help you determine the right equipment for your application and provide the pump and mechanical expertise needed to keep your commercial HVAC system running reliably.