Can Evacuated Tubes Be Mounted Less-Than Horizontal?

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  • ithacaman
    Junior Member
    • Aug 2013
    • 2
    #1

    Can Evacuated Tubes Be Mounted Less-Than Horizontal?

    I have seen a lot of evacuated tube solar thermal systems in my day...bringing down heat of course. Working fine.

    But today I saw a system which used evacuated tubes mounted such that they were not just flat, but the header pipe was actually an inch or two LOWER than the bottom of the tubes. And, the system was working well.

    How is this possible? I thought it was necessary to keep the header pipe higher than the bottom of the tubes so that the gas could condense at the header and fall to the tube bottom, then repeat.

    What am I missing?

    Tags: None
    • Mike90250
      Moderator
      • May 2009
      • 16020
      #2
      I've got no idea. Sounds odd to me.
      Powerfab top of pole PV mount (2) | Listeroid 6/1 w/st5 gen head | XW6048 inverter/chgr | Iota 48V/15A charger | Morningstar 60A MPPT | 48V, 800A NiFe Battery (in series)| 15, Evergreen 205w "12V" PV array on pole | Midnight ePanel | Grundfos 10 SO5-9 with 3 wire Franklin Electric motor (1/2hp 240V 1ph ) on a timer for 3 hr noontime run - Runs off PV ||
      || Midnight Classic 200 | 10, Evergreen 200w in a 160VOC array ||
      || VEC1093 12V Charger | Maha C401 aa/aaa Charger | SureSine | Sunsaver MPPT 15A

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        • RedDenver
          Junior Member
          • Apr 2015
          • 46
          #3
          Could be working through conduction and just not taking advantage of fluid convection.

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