Why the Heat Transfer Fluid in Your Chiller Systems Should Be Regularly Tested

When considering the performance and reliability of your chiller or HVAC system, it’s easy to focus on the visible components—pumps, compressors, heat exchangers, and pipework. Yet one of the most critical elements in the system is often hidden in plain sight: the heat transfer fluid. At Newsome, we know from experience that the quality and condition of this fluid can have a profound impact on system performance, energy efficiency, and long-term reliability. Whether your system operates on water or a glycol-based solution, regular fluid testing is an essential part of preventative maintenance—and one that can help avoid costly downtime or permanent damage.

The Role of Heat Transfer Fluid in Chiller Systems

In closed-loop cooling systems, heat transfer fluid is the medium through which thermal energy is moved away from the process. This fluid circulates continuously through a network of components, absorbing heat from one area and releasing it in another—typically via a chiller or heat exchanger. To do this effectively, the fluid must remain clean, chemically balanced, and free from contaminants. Over time, however, exposure to oxygen, incorrect top-ups, thermal stress, and microbial activity can cause fluid quality to deteriorate. When this happens, the consequences for your system can be serious.

Why Testing Matters

Contaminated or degraded heat transfer fluid can lead to a range of problems, including:

• Reduced thermal transfer efficiency
• Internal corrosion of system components
• Blocked filters, valves, or pipework
• Bacterial fouling or biofilm growth
• Increased energy consumption
• System breakdown or failure

Regular testing allows you to detect these issues before they cause damage. By monitoring the chemical and physical properties of your system fluid, you gain early insight into developing problems and can take proactive steps to protect your equipment.

Suitable for New and Existing Systems

Newsome’s fluid testing and water treatment service is available for both newly commissioned systems and existing installations. Whether you are onboarding new infrastructure or maintaining legacy equipment, fluid testing provides the data needed to assess system health and implement corrective measures if needed.

Our process begins with the extraction of a fluid sample from your system. This sample is sent to a trusted independent laboratory for comprehensive analysis, ensuring the results are accurate, impartial, and aligned with industry best practice. This independent approach not only builds confidence in the findings, but also supports regulatory compliance where required.

What Is Analysed—and Why

Laboratory testing evaluates a wide range of performance indicators, giving us a clear picture of the internal condition of your system. Key parameters include:

• PH Levels – A shift in pH can indicate corrosion or chemical instability, which can render corrosion inhibitors ineffective.
• Glycol Concentration – Critical for frost protection and thermal efficiency. A drop in concentration often signals leaks or improper top-ups.
• Electrical Conductivity – Measures the presence of dissolved solids or salts, which can lead to scaling and inefficiency.
• Turbidity (Fluid Clarity) – Cloudy fluid may indicate particulate contamination, microbial growth, or corrosion by-products.
• Iron and Other Metals – High concentrations are often linked to internal corrosion, especially in steel systems.

From Test to Treatment: Newsome’s Full-Service Support

Once we receive the lab report, our in-house engineering team reviews the data and prepares a customised action plan. Depending on the findings, this may include:

• Dosing with corrosion inhibitors or biocides
• Adjusting glycol levels
• Conducting a system flush and refill
• Installing side stream filtration for continuous particle removal

Because all corrective actions are carried out by our own engineers, we ensure that any necessary intervention is fast, efficient, and integrated into your existing service plan.

The Role of Side Stream Filtration

Where systems show signs of particulate contamination—such as suspended solids, rust flakes or scaling—we may recommend installing a side stream filtration unit. This setup diverts a portion of the system fluid through a dedicated filter, cleaning the fluid while the system operates.

Side stream filtration can be retrofitted to most systems with minimal disruption and provides continuous protection from contamination. It also helps reduce the build-up of fouling inside heat exchangers and pipework, improving thermal performance and reducing maintenance intervals.

A Proactive, Not Reactive, Approach

Fluid testing should never be seen as a one-time, reactive measure. Like all effective maintenance practices, it works best when embedded into a planned preventative maintenance (PPM) strategy. Regular testing enables us to track the condition of your system fluid over time, spot trends, and intervene early—avoiding disruption to production or facility operations. For many clients, we incorporate fluid analysis into an ongoing service agreement, aligning testing schedules with routine equipment maintenance for maximum efficiency and minimal downtime.

Applications Across Industry

The importance of fluid quality spans many sectors, from food and beverage production and pharmaceutical manufacturing to general industry, data centres, and HVAC systems in commercial buildings. Wherever temperature control is mission-critical, fluid testing offers a valuable layer of assurance and performance optimisation.

Benefits of Regular Testing

Extend Equipment Life – Protect pumps, chillers, heat exchangers, and valves from corrosion and fouling.

• Improve Efficiency – Optimise thermal transfer and reduce unnecessary energy consumption.
• Prevent Unplanned Downtime – Identify issues before they lead to failure.
• Support Compliance – Meet audit, safety, and industry standards with detailed laboratory reports.
• Reduce Operating Costs – Minimise emergency repairs and energy waste through early intervention.

Work with a Trusted Partner

With decades of experience in industrial temperature and humidity control, Newsome understands the complex requirements of fluid-dependent systems. Our engineers, service teams, and laboratory partners work together to deliver a seamless, data-driven maintenance strategy that protects your assets and keeps your processes on track.

Whether you operate a single plant or a nationwide network of facilities, our water treatment and fluid analysis services can be tailored to suit your scale, budget, and regulatory environment.

Talk to Newsome

If you haven’t tested the fluid in your chiller or HVAC system recently—or if you’re experiencing unexplained performance issues—now is the time to act. Contact Newsome today to arrange a site visit, request a sample analysis, or discuss how we can support your wider maintenance programme.

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