𝗡𝗼𝘁 𝗮𝗹𝗹 𝗿𝗲𝗳𝗿𝗶𝗴𝗲𝗿𝗮𝘁𝗶𝗼𝗻 𝘀𝘆𝘀𝘁𝗲𝗺𝘀 𝘂𝘀𝗲 𝗿𝗲𝗳𝗿𝗶𝗴𝗲𝗿𝗮𝗻𝘁 𝗱𝗶𝗿𝗲𝗰𝘁𝗹𝘆. 𝗔𝗻𝗱 𝘁𝗵𝗲 𝗿𝗲𝗮𝘀𝗼𝗻 𝗶𝘀 𝗻𝗼𝘁 𝗼𝗻𝗹𝘆 𝘁𝗲𝗰𝗵𝗻𝗶𝗰𝗮𝗹.

 

 

 

In many refrigeration installations, the choice of system architecture is not driven by performance alone.

It is a balance between:
✔️ thermal efficiency
✔️ safety constraints
✔️ and the nature of the application

This is where secondary fluids come into play.

𝗧𝗵𝗲𝘆 𝗮𝗿𝗲 𝗼𝗳𝘁𝗲𝗻 𝗶𝗻𝘃𝗶𝘀𝗶𝗯𝗹𝗲 𝗶𝗻 𝘁𝗵𝗲 𝘀𝘆𝘀𝘁𝗲𝗺…
𝘆𝗲𝘁 𝗲𝘀𝘀𝗲𝗻𝘁𝗶𝗮𝗹.

Instead of circulating refrigerant throughout the entire installation, an intermediate fluid transports the cooling capacity where it is needed.

The result:
✅ reduced refrigerant charge
✅ improved safety in sensitive environments
✅ greater flexibility in system design

This approach is increasingly used in:
✔️ large installations
✔️ public or safety-critical buildings
✔️ systems using new-generation refrigerants

But choosing a secondary fluid is not a purely technical decision.

Take glycol-based solutions:
✅ Ethylene glycol → better thermal performance
✅ Propylene glycol → lower toxicity, preferred in food environments

So the “best” fluid is not always the most efficient one.
🔴 It is the one that fits the constraints of the system.

There are also more specific solutions, such as potassium formate-based fluids, used in particular applications where performance and environmental aspects must be carefully balanced.

❗ Even something as simple as colour has a role.

Secondary fluids are often coloured to:
✔️ help identify the type of circuit
✔️ detect leaks more easily

In many installations:
🔵 Blue → medium temperature
🔴 Red → low temperature

𝗡𝗼𝘁 𝗮 𝗰𝗵𝗲𝗺𝗶𝗰𝗮𝗹 𝗿𝘂𝗹𝗲 — 𝗯𝘂𝘁 𝗮 𝗽𝗿𝗮𝗰𝘁𝗶𝗰𝗮𝗹 𝘁𝗼𝗼𝗹 𝗶𝗻 𝘁𝗵𝗲 𝗳𝗶𝗲𝗹𝗱.

Secondary fluids are not just a technical detail.

They are part of a broader evolution of refrigeration systems towards safer, more flexible, and more controlled architectures.

And in many cases, they are what makes modern systems viable.