Technical info
Corrosion
System design
Environment
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System design



Construction, design, dimensioning and installation in general of indirect cooling systems using HYCOOL are done in such a way to create a safe, functional and operationally dependable system.

Three important areas one should be aware of in particular are:
• Temperatures
• Materials
• Systems

HYCOOL is a working refrigerant medium for indirect cooling systems and is used in the secondary circuit of the system. HYCOOL satisfies requirements set for quality of refrigerant mediums moving in a high environmental profile, is compatible with most metals and polymers used by the industry, and also has good thermodynamic properties. Its low viscosity in particular leads to efficient movement and transport of large amounts of energy at a low cost.

Temperatures
The number following the respective HYCOOL version (20 to 50) gives the freezing point of the product. The working medium's freezing point should be dimensioned according to the system's lowest temperature, not according to the medium's working temperature. For cooling systems, the lowest temperature in the primary refrigerant circuit is equal to its evaporation temperature. The freezing point should be set at approximately 5 °C lower than the evaporation temperature, or 10 °C lower than the refrigerant's working temperature. Make sure the system's max/min temperatures are within HYCOOL's operating range.

Materials
Materials entering the system should be controlled to ensure these are compatible with HYCOOL, and should be installed so that no risk of corrosion arises. Soldering copper should be done using copper or silver solder. Tin solder (soft solder) and normal solder with chloride must not be used. Also make certain the temperature range of the material in question is acceptable.

System type
Closed systems are easier to deaerate and therefore are preferable to open systems, and it is easier to adapt system pressure to that recommended for system functionality. The items discussed here must be reviewed carefully if open systems are used. Alarms or system safeguards should be installed to stop the expansion chamber from running dry, from air entering the system or system pressure falling below correct calculations.

Valves
The system should be built to allow draining and filling. Install bleed valves at low points and make sure filling can also be done from the system's lowest point. Always install shut-off valves between the system and the automatic deaerator on top so that this deaerator can be dismantled or closed.

 
Clean system
The system should be cleaned of any dirt or residue particles like sand, soil, welding slag and other contaminants (flush the system when needed) before HYCOOL is filled. Systems that are not cleaned before being filled can clog valves, create leaks in pumps, and cause a risk of corrosion.

 
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