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Xringer · 01-01-12, 12:41 PM

I'm looking at the idea using using a refrigerant like CO2 (or even R410A or Propane)
in place of water (& glycol) as a solar heat transfer medium, because it seems
like it might be possible, to do without using a coolant pump..

If worked and could cheaply heat a hotwater tank in the basement,
it would be a very useful supplement to my DHW needs.

With hotwater in the collectors, you always need a pump running...
And, it runs all day, when it's sunny.

If a refrigerant could flow inside a loop, without using any electricity.?.
Why not?

The good thing about using water, is it can be heated up to 190F
pretty easily in a good panel..

Got to run..

01-01-12, 12:41 PM	#3
Xringer Lex Parsimoniae Join Date: Feb 2009 Location: Woburn, MA Posts: 4,918 Thanks: 114 Thanked 250 Times in 230 Posts	I'm looking at the idea using using a refrigerant like CO2 (or even R410A or Propane) in place of water (& glycol) as a solar heat transfer medium, because it seems like it might be possible, to do without using a coolant pump.. If worked and could cheaply heat a hotwater tank in the basement, it would be a very useful supplement to my DHW needs. With hotwater in the collectors, you always need a pump running... And, it runs all day, when it's sunny. If a refrigerant could flow inside a loop, without using any electricity.?. Why not? The good thing about using water, is it can be heated up to 190F pretty easily in a good panel.. Got to run.. __________________ My hobby is installing & trying to repair mini-splits EPA 608 Type 1 Technician Certification ~ 5 lbs or less..