In loving memory of Kenis D. Keathley 6/4/81 - 3/27/22 Loving father, husband, brother, friend and firewood hoarder Rest in peace, Dexterday

Let's design a smoke pipe setup

Discussion in 'Modern EPA Stoves and Fireplaces' started by dgeesaman, Dec 25, 2016.

  1. brenndatomu

    brenndatomu

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    Not in a damp basement where most wood furnaces reside...
     
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  2. oldspark

    oldspark

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    I looked but I must be missing it, what is the overall height of his chimney from stove to cap.
     
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  3. oldspark

    oldspark

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    Must be raining down there.:D
     
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  4. brenndatomu

    brenndatomu

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    I've never been able to get more than 3 years out of a steel stove pipe in the basement...they get scary thin...
     
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  5. oldspark

    oldspark

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    That's is interesting, I due have the thicker stuff, I wonder what your humidity is down there, you would think with a wood burner running it would not be that bad. Is it much higher in the summer when you are not running the stove?
     
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  6. brenndatomu

    brenndatomu

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    It's fine in the winter...but run a de-humidifier full time in the summer just to keep up...
     
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  7. dgeesaman

    dgeesaman

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    No idea. I'd actually have to ladder and climb to get that answer. That might be a good thing because then I can peek down and also measure the terra cotta vertical section.

    I have a slab foundation rancher, so this is ground level attached to the garage. Quite dry in fact.

    Check these out: "adjustable" elbows.
    http://www.duravent.com/docs/product/dvl_elbows_web.pdf
     
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  8. Coaly

    Coaly

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    Your manual should specify Field Control R-C which is for coal and oil use only.

    That model is not listed for wood use.
    Draft Control | Field Controls, LLC

    Type RC
    Oil or Coal - Residential and Commercial
    The Field RC is furnished as standard equipment on many leading brands of oil or coal-fired heating equipment. It is calibrated to allow for easy adjustment to the furnace or boiler manufacturer's specifications. Designed for settings from .02" to .08", this control is so sensitive that instrumentation should be used when adjusting the unit during installation.

    The wood / coal damper is RCBT (for black pipe) which is not what the UL testing was done with, and I can't answer why the appliance manufacturer recommends setting damper at .03 with wood use while field Controls does not recommend the RC for wood use. Page 4 below;
    https://www.fieldcontrols.com/filebin/pdfs/4129DraftControlGuide.pdf
     
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  9. Coaly

    Coaly

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    Yes, you "can" depending on height. But it can kill efficiency.

    Input ratings of old style wood stoves are about twice their rated input since their efficiencies are about 50%.
    Furnaces and water heaters usually have input indicated on them.
    The thousands of BTU per hour input rating on furnace determines what is required by the flue diameter and height;

    Height of flue (ft.) Area of flue (square inches) Thousands of BTU per hour input rating of combined appliances (when allowed)
    6 28 (6 inch) 71,000
    8 28 81,000
    10 28 89,000
    15 28 105,000
    20 28 120,000
    30 28 135,000

    6 50 (8 inch) 142,000
    8 50 162,000
    10 50 175,000
    15 50 210,000
    20 50 240,000
    30 50 275,000

    Realize your max input rating may not be what you normally burn.
    You can see how much more is needed as you go higher.
    This table is adapted from table 17 in Chapter 26 of the 1975 Equipment Volume of the ASHRAE handbook and product directory. It is found on page 43 of the Woodburners Encyclopedia among many other tables I highly recommend. It takes the guess work out of exactly what is needed. Connector pipe variables affect total draft but these numbers should put you within range of correct draft.
     
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  10. brenndatomu

    brenndatomu

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    Looks to me like the only difference between RC and RCBT is the color. The Yukon furnaces come with the RC...and I'm pretty sure Kuuma Vaporfires do too.
     
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  11. Coaly

    Coaly

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    Don't know for sure, can't read the listing number on the type R-C.
    I go by the manufacturer of part being used in the correct application, and that R-C is only listed for oil and coal everywhere on their site.
    Good question for their tech support. Then you'll get another answer from Yucon tech.........
     
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  12. brenndatomu

    brenndatomu

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    From what I understand the specific UL certification that Yukon has is not easy to get (MH 11057) vs the general UL listing (UL 391) that most wood heaters have. I would think that UL would nix the use of any baro that is not meant for the job...not saying your wrong, just that there must be some way that they are allowed to use 'em...
     
    Last edited: Dec 25, 2016
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  13. Coaly

    Coaly

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    The smaller the stove the more noticeable it becomes since you have less waste to use on a larger chimney.
    Chimney diameter is more decisive than height.
    It goes by net draft taking into account differential temperatures, diameter, height and resistance to flow, in that order.
    Here is why height doesn't increase the net draft as much.
    A doubling of chimney height will increase capacity by 41%.
    A 10% height increase will improve performance by 5%.
    The higher the chimney, the more the flue gasses cool before emerging out the top of the chimney. Thus the average temperature of the flue gasses decreases, which has a negative effect on chimney capacity.There is always a an improvement in chimney capacity with increased height, but the amount of improvement is diminished if heat is conducted out through the chimney walls. Insulated chimneys benefit the most from height increases.

    A 50 foot chimney is more than 8 times taller than a 6 foot chimney, but it's capacity is only 2 1/2 times more.
    A 2 foot addition on a 20 foot chimney increases capacity by only 4%.
    Since it is usually the easiest and cheapest way to increase draft, that is the way it's usually done.
    The above is all taken from Jay Shelton's Woodburners Encyclopedia. I'm no where near that smart. ;)
     
    Last edited: Dec 25, 2016
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  14. oldspark

    oldspark

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    Well not sure how to start because I went from a crappy block chimney to a insulated metal correct size chimney and removed 2 90's and it still ran the same way. That is why I question playing the numbers game, seeing is believing, not quite sure if you understood what I did.
    Bottom line of what I did was removing 2 90's and making the chimney the right size did not make any difference.
     
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  15. brenndatomu

    brenndatomu

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    I remember reading about your trials...seems like you had yourself quite the anomaly there...
     
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  16. oldspark

    oldspark

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    Looks to me like he does not know the overall height of the chimney, could be too short from the get go.
     
  17. oldspark

    oldspark

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    The chimney had nothing to do with the way the Summit ran as the new chimney did not make any difference at all.
     
  18. Coaly

    Coaly

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    Physics normally works out. Perhaps you think operation is the same, but you have a cleaner flue and a couple degree warmer house?
    I'll bet it affected your bank account. :D
     
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  19. oldspark

    oldspark

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    Long story but no it did not and the chimney was clean and had been for 30 years due to dry wood and running a nice warm flue temp.
     
  20. oldspark

    oldspark

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    I am very interested in how tall his chimney is.