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one more oveheat loop question before actually light the torch

Post in 'The Boiler Room - Wood Boilers and Furnaces' started by mmudd, Dec 20, 2012.

  1. mmudd

    mmudd Member

    Joined:
    Jun 7, 2012
    Messages:
    77
    Loc:
    Central MO
    It was said in previous threads, in general terms about dump zones, that hieght above boiler is good, distance from boiler for the overheat loop not so good. In my plan, I 'll have 32 ft of fin tube (4 runs x 8ft) manifolded together. It will be about 3.5' above boiler and location of dump will be about 4ft from boiler laterally. I need to decide, based on the orientation of the dump zone , if there will be more linear feet of pipe prior to or after the dump. Is it best to make the shortest pipe run the hot and have the cold return pipe run longer or vice versa or does it matter? I know it will thermo-syphon either way, but theorize it's best go to the dump with the hot supply being the shortest pipe run. The difference in the length of pipe run between supply and return will be about 12 ft due to space limitation. Any thoughts are appreciated. Thanks guys!

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  2. ewdudley

    ewdudley Minister of Fire

    Joined:
    Nov 17, 2009
    Messages:
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    Loc:
    Cayuga County NY
    Hotter water is less viscous, so that would be a reason to have the hot run be the longest. But it would make a small amount of difference and hopefully you won't be needing to rely on some small effect to make the difference between success and failure.
  3. mmudd

    mmudd Member

    Joined:
    Jun 7, 2012
    Messages:
    77
    Loc:
    Central MO
    That makes sense. Also this will work out a little better for the pipe runs. Thanks for your imput.

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