Transferring cold and protection against corrosion

The difference between direct cooling systems and indirect cooling systems, also known as secondary refrigeration, resides in the physical separation between the primary circuit, where the cold is generated, and the secondary system, where cooling takes place. The cold generated in the primary circuit is transported by the heat transfer fluid to the place where the products need to be cooled. Temperatures for this application can vary from -40 °C to 40 °C.

In indirect refrigeration systems, heat transfer fluids have two basic functions:

• To transfer the cold: the coolant in indirect cooling systems must remain fluid at all prevailing temperatures in the system, and the viscosity should preferably be as low as possible.
• To protect the system against corrosion: compared to other applications, corrosion protection at low temperatures requires a different set of inhibitors and a different protection mechanism. Our products are designed to offer maximum protection under all conditions.

Examples of application areas:

• Indirect systems in supermarkets:
  In supermarkets, the cold needs to be transported to a variety of fresh and frozen displays in an effective, safe and economical way. All the cooling effect required is produced in the machine room, far from the display cases, resulting in high flexibility and a reduced risk of leakage. A heat recovery system, also situated in the machine room, can provide heating for the supermarket when required. Consequently, the use of unwanted refrigerant such as ammonia in a public place is avoided, although it can still be used in the primary system.

• Medical Devices and Pharmaceutical Processing

• Power Generation and Industrial Utilities

• Polymer Manufacture

• Food and Beverage Production