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cfm

curiousity kills
curiousity kills Member Posts: 118
in THE MAIN WALL
Any formula for converting btu heat to a cfm value?

Comments

  • GMcD
    GMcD Member Posts: 477
    Easy

    CFM= Btuh/(1.08 x Delta T)

    The "Delta T" is the difference between the delivery air temperature and the final room temperature (or the temperature difference across a heating or cooling coil)
  • Jim Davis
    Jim Davis Member Posts: 305


    This only works on electric heat where BTU's are pretty much a given. Cfm must be measured in all other applications. This formula is more for calculating BTU's not CFM. Can be totally misleading and falsify the CFM.
  • GMcD
    GMcD Member Posts: 477
    True

    But for a quick estimate this will work for pretty well all heating applications. In cooling systems the issue to be considered is the latent load and the sensible load on a cooling coil and then we can play with the psychrometrics.
  • Tony Conner
    Tony Conner Member Posts: 549
    CFM Is...

    ... to fans as GPM is to pumps. All fans really are, are low head pumps for moving air. The formula is valid for any heat source.

    #/hr steam = CFM X 1.08 X delta-T/1,000.

    The formula above for heating air with steam has been in the Spirax Sarco book "Hook-Ups" for decades. (And they likely got it from some other publication.) If you want BTU/hr instead of #/hr, just don't divide by 1,000. The souce of the BTUs is irrelevent.
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