Welcome! Here are the website rules, as well as some tips for using this forum.
Need to contact us? Visit https://heatinghelp.com/contact-us/.
Click here to Find a Contractor in your area.

cfm

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

Welcome

It looks like you're new here. Sign in or register to get started.
Sign In
Register

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.
This discussion has been closed.

Welcome

It looks like you're new here. Sign in or register to get started.
Sign In
Register

Quick Links

Categories