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Yes, ANOTHER OWB build thread... (Tank in tank style)

Discussion in 'Firewood, Heating and Wood Burning Equipment' started by breymeyerfam, Jul 16, 2016.

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Water volume in owb? 2500sf home and 34x48 shop

  1. 100 gallons

  2. 200 gallons

  3. 300 gallons

  4. 400 gallons

  5. 500 gallons

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  1. breymeyerfam

    breymeyerfam Addicted to ArboristSite

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    Yeah, the hinges are definitely overkill, but I want to be able to adjust the door fit over time. I want ZERO air leakage around the door.
     
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  2. huntmaster86

    huntmaster86 ArboristSite Lurker

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    boiler looks great!!! wish you were making this last summer so i could of incorporated some of your design in my boiler.
     
  3. breymeyerfam

    breymeyerfam Addicted to ArboristSite

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    Pressure test is a success. Has held steady over night.
    20160922_200617.jpg
     
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  4. breymeyerfam

    breymeyerfam Addicted to ArboristSite

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    For anyone wanting a better idea of how my design looks on the inside, I 3d modeled it and then did this cutaway view. This gives a good shot of how the flue and firebox are positioned within the water jacket.
    Boiler Section.jpg
     
  5. breymeyerfam

    breymeyerfam Addicted to ArboristSite

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    The bottom of the door opening is 36" from the ground. That makes this thing very tall. Legs are 5x5x1/4 square tube I had laying around.
    20160924_152940.jpg
    20160924_182132.jpg
    20160924_200301.jpg
    20160924_200345.jpg
     
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  6. NSMaple1

    NSMaple1 Addicted to ArboristSite

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    Is there anything under the rear of the firebox for support? Or is all the weight hanging by the front face?
     
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  7. breymeyerfam

    breymeyerfam Addicted to ArboristSite

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    Yes, I have spacers at the front and rear of the firebox so it can rest on the bottom of the water jacket. (This also helped me keep my positioning correct when I inserted the firebox and face to be welded into the big tank)
     
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  8. NSMaple1

    NSMaple1 Addicted to ArboristSite

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    Ok, cool.

    That question just kind of popped into my head after some recent internet reading re. the old Wood Doctor debacle. The selling/marketing side, was placing blame for their failures or some of it at least, on the manufacturing side for short cutting & doing that exact thing. (Hanging the firebox off the front).
     
  9. breymeyerfam

    breymeyerfam Addicted to ArboristSite

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    Door latch. Cam over bearing type.
    20160925_171355.jpg
    Open:
    20160925_171425.jpg
    Closed:
    20160925_171445.jpg
     
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  10. absrio

    absrio ArboristSite Operative

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    along this same line of thought did the op place some spacers on the top of the burn chamber?? just think a hollow tank (basically) inside a tank of h2o will want to float.
     
  11. breymeyerfam

    breymeyerfam Addicted to ArboristSite

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    No, other than the flue pipe welded up through both tanks.
     
  12. LondonNeil

    LondonNeil Addicted to ArboristSite

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    I'm enjoying reading this, keep up the great work!
     
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  13. dave_dj1

    dave_dj1 Addicted to ArboristSite

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    Very cool, I wish I had the time and money to build one exactly like it. Keep the updates coming. What size building(s) are you heating with it?
     
  14. breymeyerfam

    breymeyerfam Addicted to ArboristSite

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    2500sf home and 34x48 shop
     
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  15. dave_dj1

    dave_dj1 Addicted to ArboristSite

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    Tell me your thoughts on this idea. It is related to circulation inside the unit. I was thinking if I built one I would have spiral fins on the outside of the firebox in hopes it would create some natural flow and to help more efficiently dissipating the heat transfer.
     
  16. breymeyerfam

    breymeyerfam Addicted to ArboristSite

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    Not sure. Test fired mine up to full operating temp (180°) today. With a pump circulating water, I feel that I have a good flow within the tank. From front to back, there was only a degree or two difference. From top to bottom there was maybe 4 or 5°.
     
  17. breymeyerfam

    breymeyerfam Addicted to ArboristSite

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    FIRST FIRE AND TEST TO OPERATING TEMPERATURE IS A SUCCESS!
    Pics:
    Lighting first fire
    20161001_150404.jpg
    Wood was kinda wet so little more smoke than I would like...
    20161001_151027.jpg
    Flue temp about 12" above water jacket. 550-650 was the avg and the highest I saw was just over 700°. Mind you this was cherry, I'm sure oak or hickory will raise that.
    20161001_161433.jpg
    Reached full temp!
    20161002_122446.jpg
    After reaching temp, I used the hose and sprayed the tank to simulate a heat draw. Repeatedly would take 5 or 6 minutes of this to drop the water temp 5°.
    20161002_114221.jpg
    Water was evaporating off the tank pretty quick at 180°!
    20161002_122927.jpg
     
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  18. H-Ranch

    H-Ranch ArboristSite Guru

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    Nicely done! Just in time to add a real heat draw and end the simulations. :yes:
     
  19. breymeyerfam

    breymeyerfam Addicted to ArboristSite

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    10-4! Things I'm hoping to have done in the next 2 weeks:
    1. Get insulation on tank. I already have quoted spray foam @ $400-$450 for 4" thick.
    2. Lining up mini-excavator and concrete core machine for burying my pipe and coring through my basement wall and the floor of my shop.
    3. Get concrete pad poured to set boiler on.

    Final goal is to have this thing fired up and running by NOV 1.
     
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  20. huntmaster86

    huntmaster86 ArboristSite Lurker

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    looking good!!! enjoying following your build
     

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