Solar water heating systems that use an antifreeze solution propylene glycol or ethylene glycol as a heat transfer fluid have effective freeze protection as long as the proper antifreeze concentration is maintained.
Glycol solar panels.
It s non toxic biodegradable and relatively stable.
In all three scenarios if a glycol fluid is used the residual glycol remaining in the panels becomes acidic and can cause corrosion issues.
Air in the loop can cause pump.
When commissioning a pressurized glycol solar hot water system it is essential that all the air in the solar loop is removed.
Air in the collectors and the pipe is pushed out the purge hose back into the top of the bucket by the charge pump.
However you should always mix as much water as possible with your choice of glycol product as simple water is the ideal solar fluid.
Dynalene solar glycol xt msds page 5 of 5 whitehall pa 18052 610 262 9686 date of printing.
Typically any time a system has a glycol bulk temperature in the range of 250 f 121 c fluid degradation increases.
The information contained herein is based on data considered accurate.
All glycol products used in solar fluid mixes come with a dilution chart an example of which is shown below.
This glycol is completely non toxic safe for all types of solar heating applications and is made from sustainable bio based raw materials.
This is done through the use of mixing water with specially formulated solar glycol to avoid freezing and large scale damages.
Fernox protector solar s1 is supplied as a ready to use premix in 10 and 20 litre sizes.
Propylene glycol pg has become the most common heat transfer fluid used in closed loop solar heating systems that contain antifreeze.
Antifreeze fluids degrade over time and normally should be changed every 3 5 years.
The formulation should not be diluted prior to use.
By code any solar application involving potable drinking water must use a non toxic blend of solar glycol known as propylene.
The industry standard for solar fluid is a mix of propylene glycol and water.
At first air returns into the bucket and then glycol mixture with air and foam which can be very hot.
However no warranty is expressed or implied regarding the accuracy of these data or the results to be obtained from the use thereof.
Do not take internally.
It has a long track record over many decades in this application and is widely available from a number of sources.
Glycol is now pumped out of the bucket filling the solar collectors from the bottom to the top.