BioFROST® GEO is a ready-to-use, biobased, USP Grade propylene glycol (PG) heat transfer fluid formulated to safely provide optimum heat transfer, freeze protection and corrosion protection for geothermal heat pump systems. GEO is a clear 20% PG / inhibitor blend with an optional dye for leak detection.
*Propylene glycol is toxic to cats, however, so don't let them drink it. Calcium Chloride. Calcium Chloride performs well as an antifreeze in earth loops. It is non-toxic but extremely corrosive. If this type of antifreeze is used, the geothermal heat pump's water coil heat exchanger must be cupro-nickle.
Typically propylene glycol is used Ethylene glycol is outlawed in many locations due to toxicity. If you need it depends on your soil temps and field size/load. Here in WI it is common. RE: Ground Source Heat Pump Loop (geothermal) anti-freeze
Geothermal designers and technicians utilize specialized ground source heat pumps and a geothermal fluid to transfer this energy from the earth's crust to the surface. Geothermal fluid is typically formulated from either inhibited propylene glycol or inhibited ethyl alcohol. Ethyl alcohol, or ethanol, is a molecule having one hydroxyl group on a 2 carbon chain, making it less viscous and providing slightly better heat transfer properties than either propylene glycol or ethylene glycol.
Both of these fluids have similar freeze protection and heat transfer characteristics with the main difference being that propylene glycol has a lower toxicity level. Due to its lower toxicity, propylene glycol is more commonly used in residential and small commercial HVAC systems.
Geothermal Supply Company offers propylene glycol to be used as antifreeze in geothermal loop systems. The type of propylene glycol provided is the same as that used as a moisturizer in medicines, cosmetics, food, toothpaste, mouth wash and tobacco products. When most fluids freeze, they expand in volume which can often cause pipes to rupture.
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