Learn how remote tanks, basin heaters, glycol protection, and proper winter operating procedures can help prevent freeze damage and maintain cooling tower performance throughout the coldest months of the year.
Industrial facilities depend on cooling towers to support critical manufacturing and process operations throughout the year. While cooling towers are designed to operate outdoors in a wide range of environmental conditions, freezing temperatures introduce challenges that require proper planning and system design.
Without adequate freeze protection, ice formation can lead to equipment damage, production interruptions, increased maintenance costs, and reduced system performance. Understanding the available protection methods can help facility managers maintain reliable cooling tower operation throughout the winter season.
Why Cooling Tower Freeze Protection Matters
As ambient temperatures drop below freezing, water within the cooling tower system becomes vulnerable to ice formation. Areas particularly susceptible include:
- Cold water basins
- Distribution piping
- Water distribution sprinkler systems
- Pumps
- Exposed process piping
- Make-up water lines
Even a short period of freezing conditions can cause significant damage if water is allowed to remain stagnant or unprotected within the system.
For facilities that operate year-round, implementing a freeze protection strategy is essential to protect equipment investments and maintain continuous production.
Preferred Solution: Indoor Remote Process Water Tank
The most effective approach for year-round cooling tower operation in freezing climates is the use of a remote process water tank located inside a temperature-controlled environment.
In this configuration, the cooling tower remains outdoors where it can effectively reject heat. Once the process water has been cooled, it returns by gravity to an indoor storage tank. The process pumps then circulate water from the tank through the manufacturing process and back to the cooling tower.
This design provides several important benefits:
Enhanced Freeze Protection
Because the primary water volume is stored indoors, the risk of freezing is significantly reduced even during extended periods of cold weather.
Improved Reliability
Facilities operating continuously during winter often experience greater reliability with indoor storage systems compared to relying solely on electric basin heaters.
Reduced Operating Risk
The controlled environment helps protect critical water volume from extreme weather conditions and reduces the likelihood of freeze-related shutdowns.
Lower Maintenance Requirements
With less exposure to freezing temperatures, system components generally experience fewer winter-related maintenance issues.
For many industrial applications, a remote indoor tank remains the most dependable long-term solution for freeze protection.
Alternative Solution: Cooling Tower Basin Heaters
When installation of an indoor process tank is not practical, immersion heaters provide an effective alternative.
Immersion heaters are installed directly within the cooling tower cold water basin and are designed to maintain water temperatures above freezing.
Screw-In Heaters for Smaller Towers
Smaller cooling towers commonly utilize screw-in immersion heaters that thread directly into the cold water basin.
These units provide a simple and economical solution for protecting smaller water volumes from freezing.
Bottom-Mounted Heater Systems for Larger Towers
Larger industrial cooling towers may utilize bottom-mounted immersion heaters installed directly in the cold water basin to provide freeze protection for larger water volumes.
The immersion heater itself provides the heating source, while system controls and electrical integration are typically supplied and configured by others involved in the project.
Depending on the facility’s requirements, mechanical contractors, electrical contractors, or control system integrators commonly provide and install:
- Temperature controls
- Thermostats
- Control panels
- Low-water safety devices
- Electrical wiring and power connections
- System automation and monitoring controls
This approach allows each facility to select the control strategy that best aligns with its operational requirements and site standards.
Important Note Regarding Heater Controls
CTS Cooling Tower Systems supplies immersion heaters that can be installed within the cooling tower basin. Temperature controls, thermostats, control panels, electrical integration, automation systems, low-water cut-off devices, and associated control equipment are typically supplied, installed, and configured by the project’s mechanical contractor, electrical contractor, or controls provider unless otherwise specified.
The Role of Glycol in Freeze Protection
In regions experiencing severe winter temperatures, adding glycol to the process water may provide an additional layer of protection.
Benefits include:
- Lowering the freezing point of the fluid
- Reducing the risk of freeze-related equipment damage
- Protecting production processes during extreme cold events
- Minimizing the likelihood of burst pipes
While glycol can be beneficial, concentrations should be carefully evaluated to ensure they align with the application’s thermal performance requirements.
Additional Winter Operation Best Practices
Successful winter operation extends beyond heaters and glycol. Several preventive measures can significantly improve system reliability.
Keep Water Moving
Circulating water is less likely to freeze than stagnant water. Maintaining flow through the cooling system whenever possible can help reduce ice formation.
Inspect Freeze Protection Equipment
Before winter arrives, facilities should verify that:
- Basin heaters are functioning correctly
- Thermostats are properly calibrated
- Low-water safety devices are operational
- Piping insulation remains intact
- Electrical controls are working properly
Preventive inspection often identifies potential issues before they result in downtime. For a full preventive review, work through our complete cooling tower maintenance checklist before the season starts.
Follow Proper Shutdown Procedures
If a cooling tower will be shut down during freezing conditions, all outdoor water must be completely drained from the system.
This includes:
- Cold water basins
- Distribution systems
- External piping
- Pumps and auxiliary equipment
Failure to fully drain the system can allow trapped water to freeze, expand, and damage critical components.
Planning Ahead for Winter
Every cooling tower installation faces unique operating conditions, process requirements, and environmental challenges. Selecting the appropriate freeze protection strategy depends on factors such as climate, operating schedule, system design, and facility requirements.
Whether utilizing a remote indoor process tank, basin heater system, glycol protection, or a combination of these methods, proactive winter preparation is the key to maintaining reliable cooling tower performance.
Proper planning today can prevent costly repairs, equipment damage, and production interruptions tomorrow.
Cooling Tower Solutions from CTS Cooling Tower Systems
For over 40 years, CTS Cooling Tower Systems has supplied reliable cooling tower solutions for industrial and commercial applications throughout North America.
Our product offerings include:
- Counterflow cooling towers
- Crossflow cooling towers
- Fiberglass cooling towers
- Factory-assembled cooling towers
- Field-erected cooling towers
