Most solar thermal systems use antifreeze as the liquid to transport heat from the solar panel to the cylinder. However, there are a few drain back systems that only use water. The antifreeze is normally non-toxic propylene glycol (as opposed to toxic ethylene glycol). An antifreeze change may be required for your solar system.
degradation of the antifreeze, leading to acidity. This can potentially lead to corrosion of the pipe work, solar cylinder or solar panel. breakdown of the in-built inhibitors. blockage of liquid channels in the system.
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To prevent burst pipes in the solar panel the circuit is filled with antifreeze solution, around 40% by weight of propylene glycol will protect the solar panels down to -20C. The volume of the solar fluid will change as its temperature changes, expanding when it heats up and contracting when it cools down.
Our solar heat transfer fluids are designed for use with hot plate and vacuum tube solar heating systems. The most popular thermal fluids in the range are the Sentinel R100 Solar Thermal Fluid, a stable, non-toxic glycol fluid and the Cura Solar Heat Transfer Fluid, a ready to use fluid that offers frost protection to -28°C.
Solar protectors are chemicals formulated for use as heat transfer fluids within solar thermal heating systems at elevated temperatures, in excess of 180°C. The most popular solar protector in the range is the Fernox Solar Protector, a solar fluid compatible with all makes and models of solar panels.