RF calculator?

Discussion in 'Reverse Flow' started by inkjunkie, May 10, 2016.

  1. inkjunkie

    inkjunkie Master of the Pit

  2. daveomak

    daveomak Smoking Guru OTBS Member SMF Premier Member

    Edit: 2-16-2014 ; You will need a hand held calculator, smart telephone, or your computer.... calculator, to use this tutorial.. It does not crunch numbers for you.....

    Calculations for a standard design, reverse flow smoker..

    Gallons X 231 = volume in cubic inches.... Sometimes the tag, in gallons, reflects a 20% air space for expansion....

    Volume of the Cook Chamber.... Use the Inside Diameter of the tank...

    Diameter X Diameter X 0.7854 X Length = Volume in cubic inches

    Volume in cubic inches X 0.004 = FB/CC opening in square inches

    Volume in cubic inches X 0.004 = Area under the RF plate in square inches

    Volume in cubic inches X 0.004 = Area required at the end of the RF plate in square inches

    Volume in cubic inches X 0.33 = minimum volume of the Fire Box

    The above areas are necessary for great air/heat/smoke flow.... using less may cause an overheated FB.... Narrow / Long CC may require an increase in those numbers due to increased surface area friction to volume... Wide/Fat Short CC may use smaller numbers due to reduced surface area friction to volume...

    Volume in cubic inches X 0.001 = FB air inlets in square inches...

    Recommended upper and lower air inlets... Upper air inlet directly across from the FB/CC opening to facilitate moving heat from the FB to the CC, and insuring good air flow through the CC.. The lower air inlet should be situated at or below the fuel grate.... The two air inlets can share the designated square inches of opening....
     
     
  3. martyinco

    martyinco Newbie

    adam a likes this.
  4. inkjunkie

    inkjunkie Master of the Pit

    And my question still hasn't been answered...
    "Volume in cubic inches X 0.001 = FB air inlets in square inches.."

    Volume of WHAT in cubic inches....the firebox or the cook chamber?
    I assume the cc...but want to make sure. .
     
  5. inkjunkie

    inkjunkie Master of the Pit

  6. daveomak

    daveomak Smoking Guru OTBS Member SMF Premier Member

    Calculations for a standard design, reverse flow smoker..

    Volume of the Cook Chamber.... Use the Inside Diameter of the tank... All smoker calculations are based on the volume of the Cook Chamber....

    Diameter X Diameter X 0.7854 X Length = Volume in cubic inches / 231 = Volume in gallons

    Volume in cubic inches X 0.004 = FB/CC opening in square inches
     
     

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