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Solar Fluid Rec?

charlie_16
charlie_16 Member Posts: 9
in THE MAIN WALL
I am installing an evacuated tube solar system, many of the components coming from Silicon Solar. I will report on how things go together when it is all more together. My question now is a suggestion for my circlating fluid (closed loop). I know propylene glycol, but there are many varieties out there. One cust svc. rep at SS suggested RV plumbing antifreeze, which is relatively inexpensive. Other sources online are selling stuff for $40 gallon and the auto parts store has Prestone PG for about $15 a gal. So- what are you guys using?
Appreciate your thoughts.
Charlie in NJ

Comments

  • hot_rod
    hot_rod Member Posts: 23,398
    a high temperature, non toxic

    HD fluid. Evac tubes have a very high stagnation temperature, above 400F

    Tyfocor makes an extreme temperature glycol specfically for evec tube system.

    No way on RV, automotive or low priced fluids as they just don't have the inhibitor package added to work under those conditions.

    At the very least DowFrost HD, Nobel No-Burst HD or any of the other heavy duty (HD) fluids out there.

    hr
    Bob "hot rod" Rohr
    trainer for Caleffi NA
    Living the hydronic dream
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