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Thread: Ratio sqft/gallon

  1. 07-12-2012, 05:20 PM #1
    firmwood
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    Ratio sqft/gallon

    Would anyone think there's a sweet spot for gallons per square foot of transfer area?

    Too much transfer area maybe result with incomplete combustion ?

    Too little and heat floats away before transfer to water?

    I've done the math, ratios are all over the place, opinions? I'm sure there's people here who's been in the field of this area.

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  2. 07-12-2012, 06:00 PM #2
    Wood Doctor
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    Transfer Area?

    Quote Originally Posted by firmwood View Post
    Would anyone think there's a sweet spot for gallons per square foot of transfer area?

    Too much transfer area maybe result with incomplete combustion ?

    Too little and heat floats away before transfer to water?

    I've done the math, ratios are all over the place, opinions? I'm sure there's people here who's been in the field of this area.

    Sent from my PC36100 using Tapatalk 2
    Please define transfer area and gallons of what? That would likely open up dozens of responses.

    In short, define the problem.
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  3. 07-12-2012, 06:08 PM #3
    Steve2910
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    Quote Originally Posted by Wood Doctor View Post
    Please define transfer area and gallons of what? That would likely open up dozens of responses.

    In short, define the problem.


    Did I get 'em all??? After reading the OP, I felt like a fourth grader who just stumbled into a calculus class.
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  4. 07-12-2012, 07:29 PM #4
    H-Ranch
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    OK, so I'm going to assume you're talking OWB firebox surface area to gallons of water in the system. I think there are too many variables to define a "sweet spot". Insulation, ambient temperature, pump flow rate, heat exchanger size, square footage of house, quality of wood, number of fills per day, firebox shape, and so on and so on...

    There is certainly a range which is practical though - a truck-sized firebox with 5 gallons of water surrounding it will be just as useless as a fist-sized firebox with 10,000 gallons of water. I'm going to estimate mine is 40 square feet with 170 gallons.
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  5. 07-12-2012, 07:44 PM #5
    ShaneLogs
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    Quote Originally Posted by Steve2910 View Post


    Did I get 'em all??? After reading the OP, I felt like a fourth grader who just stumbled into a calculus class.
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  6. 07-13-2012, 05:18 AM #6
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    Quote Originally Posted by H-Ranch View Post
    OK, so I'm going to assume you're talking OWB firebox surface area to gallons of water in the system. I think there are too many variables to define a "sweet spot". Insulation, ambient temperature, pump flow rate, heat exchanger size, square footage of house, quality of wood, number of fills per day, firebox shape, and so on and so on...

    There is certainly a range which is practical though - a truck-sized firebox with 5 gallons of water surrounding it will be just as useless as a fist-sized firebox with 10,000 gallons of water. I'm going to estimate mine is 40 square feet with 170 gallons.
    Cb's 2nd big unit is almost 1:1, but their smaller units, ratio gets further apart as the firebox size decreases. Not sure if that's for a particular reason or just the way it had to work out for engineering purposes. Their biggest CB model goes the opposite then the smaller ones. I've never saw the insides of their bigger units, not sure if the fb is designed differently

    Just getting opinions.

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    Last edited by firmwood; 07-13-2012 at 05:24 AM.
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  7. 07-13-2012, 05:20 AM #7
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    duplicate
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  8. 07-13-2012, 06:09 AM #8
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    Here's a link to thread I started on a similar question. I think the answer to your question isn't going to be in gallons but rather in square inches of surface area to cubic inches of water. Which of course could be converted to gallons.

    OWB design. More water? Less water?
    Last edited by AIM; 07-13-2012 at 06:21 AM.
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  9. 07-13-2012, 06:21 AM #9
    firmwood
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    Must of missed that in the search hits. Mods, remove post if desired.

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  10. 07-13-2012, 06:27 AM #10
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    I don't have a single scientific fact to back this up but I'm leaning towards about 12 cubic inches of water to about 1 sq inch of area.

    Basically a water jacket 12" larger than fire box on all sides. Maybe 16" larger? Much beyond that and I think thermal transfer will start tapering off.
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  11. 07-13-2012, 07:08 AM #11
    firmwood
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    I'm using a 1000 gal tank. 5ft diameter, 7ft long

    4" thickwall pipe will be going through inside of.the tank near edges, down sides and across top. 16 going up/down, 8 on each side. Then 8 going across top. These will mimic Cbs ripple top, with mine being additional to the sides.

    to mmimic the water baffel drop near the back before chimney exit, ill be using a 12" pipe, then just below that, a bit forward, a 8" pipe.

    Then the whole mess somehow inside of a 6ft diameter tank, might use the cable crane on this diaster, giving me 6" of water jacket around the firebox.

    The door will be filled with water. The tank ends are bubbled, so my hinges will be 1/2 ton car spindles and hubs, once anchored, cut my door seam, presto, prehung and cut to fit door. Draft will be a 8" pipe through door at bottom. Door backside will be welded shut with a 5ft round piece. Hose ontop and bottom, thermal circulation will take over, and door wont warp because of water.

    Heating two houses, partial heat in garages, dhw, a hot tub, and possibly the floor.of a 40x60 when poured.

    I'm also going to have a 8" pipe.going from firebox through waterjacket and out the top,.and capped, I'm anticipating auger fill with woodchips/mulch. I'd rather weld it in now instead of later. I've acquired a industrial wood chipper, and just setup a hammermill with a small block Chevy and 350t. With some work, timers, relays, hopper, and an auger, I can have a somewhat auto fill, even if at first requires standing and watching operation at first. But still have the option to load from front for rounds/firewood/small stumps.

    Mad scientist ideas....and always thinking like a lazy man



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  12. 07-13-2012, 05:52 PM #12
    Steve2910
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    24 hrs later, & this one's still beyond my pay grade... Think I'll just unsubscribe.
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  13. 07-14-2012, 03:52 AM #13
    firmwood
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    I was trying to have as much water jacket exposure as possible to soak BTUs for my heat demand. I figured having 16 pipe up/down on the inside would promote impressive thermo siphon and prevent hotspots.

    But having more cold surface area, wasn't sure if I'd have a terrible creosote gumbo buildup, per say worse then a different "ratio" or if that's inevitable ...

    Hard to maintain a decent clean burn with 200* water around it.
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  14. 07-14-2012, 04:03 AM #14
    AIM
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    Gotta say ya totally lost me on your design....
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  15. 07-14-2012, 05:47 AM #15
    firmwood
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    Quote Originally Posted by AIM View Post
    Gotta say ya totally lost me on your design....
    A tank with pipes going through it thats also surrounded by water. Ill draw something up later.

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