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Originally Posted by jeff5may
Those are some pretty stiff specs. What you are talking about here is hydraulic oil or brake fluid. Neither of which make extremely efficient heat transfer fluids.
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How about oils like this one?
http://s02.static-shell.com/content/...ansfer-oil.pdf
It seems to be made for the purpose, what's the downside? This would be a good "Checklist" for what other properties to look for, in a solar panel fluid: Heat Transfer Fluids for Solar Water Heating Systems | Department of Energy
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Space heating/cooling and water heating by solar, Annual Geo Solar, drainwater heat recovery, Solar PV (to grid), rainwater recovery and more ...
Installing all this in a house from 1980, Copenhagen, Denmark. Living in Hong Kong. Main goal: Developing "Diffuse Light Concentration" technology for solar thermal.
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