Antifreezes are special compounds used in combination with water in heat pump and other heating and cooling systems to prevent water from freezing at low temperatures. This ensures the uninterrupted operation of the systems even in cold weather conditions.
How does antifreeze work?
Freezing point reduction: The antifreeze solution freezes at a lower temperature than pure water, thus preventing systems from freezing.
Maintaining heat transfer: Antifreeze maintains the fluid's proper thermal conductivity, which is essential for the efficient operation of heat pumps.
Corrosion protection: Additives in antifreeze reduce the risk of corrosion and oxidation, protecting the system from material damage.
Types of antifreeze
Ethylene glycol-based antifreezes: Highly effective in preventing freezing, but toxic, so their use is recommended only in industrial or closed systems.
Propylene glycol-based antifreezes: More environmentally friendly and less toxic alternatives, often used in residential systems, such as heat pumps.
Glycerin-based antifreezes: Less common, but provide a safe and environmentally friendly solution in certain systems.
Important information on the use of antifreezes
Correct concentration setting: The concentration of antifreeze in the solution must be adjusted to the intended operating temperatures of the system.
Example: In a system designed for -20 °C, a 30–40% antifreeze concentration is usually required.
Maintenance: The effectiveness of antifreeze may decrease over time, so the freezing point and the condition of additives must be checked regularly. Antifreeze replacement is recommended every 2–5 years, depending on how intensively the system is used.
Environmental considerations: Antifreezes must be handled and disposed of properly, as some types (e.g., ethylene glycol) can be harmful to the environment.
Safety measures: When handling antifreeze, the product's safety data sheet (MSDS) must be considered, especially when using ethylene glycol.
Summary
Antifreezes are essential for the safe and efficient operation of heat pump and other similar systems. Ethylene and propylene glycol-based antifreezes are particularly popular as they protect systems from freezing, reduce corrosion, and ensure efficient heat transfer. Regular inspection and maintenance are necessary to maintain the effectiveness of the antifreeze solution and the long lifespan of the system for optimal operation. Environmental and safety aspects are also crucial when using antifreezes.