Glycol questions

Solar Domestic Hot Water and Solar hot water heating for homes and pools
Rusty Sprockets
Posts: 16
Joined: Wed Apr 29, 2009 7:53 pm

Glycol questions

Postby Rusty Sprockets » Sun Oct 30, 2011 9:27 pm

2 questions....

1. How do I tell if my glycol is too old and no longer works at its best?

2. Whats the formula to figure out how much glycol I need to fill my system?



Conundrum
Site Admin
Posts: 352
Joined: Wed Apr 29, 2009 5:43 pm

Re: Glycol questions

Postby Conundrum » Sun Oct 30, 2011 9:40 pm

Those are easy ones....

1. To test glycol in a solar system, a pH test must be preformed. We sell and rent a calibrated ph tester (digital). Litmus strips can also be used, but are not as accurate.
Concentrated propylene glycol has a pH above 9 and is about 8 or above when mixed 50/50 with water. When the pH of the solution falls below 7 - it needs changing. Usually this is also accompanied by a change in color. Our Thermoliquatix brand changes from a straw color to a brownish color.

2. Capacity calculation depends on the units your pipe is measured in. To get the answer in gallons, use these:

If in feet:
(radius_of_pipe)*(radius_of_pipe)*(3.14)*(length_of_pipe)*7.48

if in inches:
(radius_of_pipe)*(radius_of_pipe)*(3.14)*(length_of_pipe)*7.48*12*12*12

if in meters:
(radius_of_pipe)*(radius_of_pipe)*(3.14)*(length_of_pipe)*264.17

Rusty Sprockets
Posts: 16
Joined: Wed Apr 29, 2009 7:53 pm

Re: Glycol questions

Postby Rusty Sprockets » Sun Oct 30, 2011 9:44 pm

Ok, so whats the difference between your Thermoliquatix and just regular car antifreeze?

Also, how do I pressurize the system if I do change the glycol?

Conundrum
Site Admin
Posts: 352
Joined: Wed Apr 29, 2009 5:43 pm

Re: Glycol questions

Postby Conundrum » Mon Oct 31, 2011 10:12 pm

To finish up the question from before about how to calculate the amount of glycol in a system. There is a calculator under the resources section here: http://www.unpluggedpowersystems.ca/content/resources

Thermoliquatix is made with Dowfrost-HTF and distilled water. The solution has very good thermal characteristics but it also the fluid is food-safe. That means if you happen to live in the city, there is no need for backflow prevention on your plumbing system.

To pressurize the system we have a filler cart, but you can just use a drill pump.


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