INDUSTRIAL REFRIGERATION
Beyond indirect refrigeration, bio-PDO HTFs are ideal for heat pumps and solar thermal systems, due to their thermal stability (up to 200°C) and effi ciency, geothermal systems, thanks to their biodegradability and bacteriostatic properties, and resistance to biological growth, plus domestic and industrial heating, where they ensure consistent performance and protection.
fl ow rate, which will be similar for all glycol-based HTFs, as well as the viscosity of the HTF at the operating temperature, which will be directly proportional to the power consumption of the pump, i.e. lower viscosity will result in lower pump energy consumption.
The viscosity characteristics of bio-PDO, when compared to MPG, can deliver signifi cant operational advantages. By opting for bio-PDO, it is possible to reduce both pipe and pump dimensions during the design phase, which directly translates into lower energy consumption. Switching from MPG to bio- PDO can off er additional benefi ts, even in existing systems. However, it is essential to conduct a pressure drop calculation and a feasibility study to ensure a smooth and eff ective transition. Regardless of the glycol chosen, corrosion inhibitors are essential to preserve system longevity and effi ciency. There are diff erent types of corrosion inhibitors; some coat all the surfaces, which can become a barrier to heat transfer. The most advanced technologies, such as those developed by the Climalife R&D team and used exclusively within their products, can protect circuits without compromising heat transfer, ensuring optimal long-term performance. While MPG is often referred to as ‘food safe’, no HTF is considered safe for direct contact with food. However, some HTFs, including some Bio-PDO-based HTFs, have earned the NSF HT1 registration, certifying their suitability for use in secondary refrigeration systems where accidental food contact may occur. This provides an additional layer of assurance for operators in the food and beverage industry.
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The role of refrigerants in indirect refrigeration The phasedown of high-GWP refrigerants in Great Britain means indirect refrigeration systems are increasingly necessary for safe, low-GWP operation. Many industrial systems using A3, B2L or low GWP refrigerants (A1 or A2L) rely on secondary HTF circuits.
When aiming to reduce emissions, it is essential not to
overlook the importance of using refrigerants with a very low GWP (Scope 1). For Scope 2 emissions, adopting an eco-effi ciency approach is key to comparing the diff erent refrigerants that we can use for the chillers. For example, with new R-1234ze chillers (oil-free compressors), we can optimise the coeffi cient of performance (COP), reduce electricity consumption and result in lower emissions compared to ammonia screw chillers. Energy consumption is having more of an impact today, making it crucial to consider both the refrigerant and the HTF for a truly sustainable system. However, sustainability should not end with refrigerant choice. The HTF plays a critical role in reducing Scope 2 and 3 emissions, making it just as important as the refrigerant in achieving true sustainability. In indirect refrigeration systems, the HTF is just as critical
as the refrigerant. As environmental scrutiny intensifi es, operators must evaluate their HTF choices to ensure they are not overlooking a key opportunity to reduce emissions and improve effi ciency. Is your heat transfer fl uid helping you achieve your
environmental targets, or is it an overlooked opportunity? For forward-thinking organisations, bio-based HTFs off er a smart, sustainable solution for indirect refrigeration systems.
"MPG and MEG are the most commonly used products on the market; however, there is an alternative that can signifi cantly help to reduce Scope 2 and/ or Scope 3 emissions through its lower
viscosity and bio-sourcing."
FANS
READY FOR THE CHANGE FROM R134a to R456A?
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increasing prices and reducing the availability of R134a.
increasing prices and reducing the availability of R134a.
Stricter regulations and reduced quotas are Stricter regulations and reduced quotas are
READY FOR THE CHANGE FROM R134a to R456A?
Keeping you cool under pressure
Keeping you cool under pressure
Nat Refrigerants INSET qp ACR
May26.indd 1 Nat Refrigerants INSET qp ACR May26
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Drop-in refrigerant; no oil change, no system modifications.
Drop-in refrigerant; no oil change, no system modifications.
R456A
R456A
29/4/26 14:09 29/4/26 14:16
www.acr-news.com • May 2026 13
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