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Thread: CFM = 1TON ?

  1. #1
    Join Date
    Apr 2005
    Location
    nyc
    Posts
    23

    CFM = 1TON ?

    How many CFM's of air equal one ton of refrigeration?

  2. #2
    Join Date
    May 2008
    Location
    Central Pennsylvania
    Posts
    443
    That all depends on how the system is engineered. Engineers normally figure 350 - 400 cfm per ton.

  3. #3
    Join Date
    Aug 2009
    Posts
    34
    The answer will vary depending on application. Rule of thumb is 400 CFM/Ton for a residential unit or unti with very little outdoor air.

    Rule of thumb for 100% outdoor air is 250 CFM/Ton.

    Big difference.

  4. #4
    Join Date
    Dec 2004
    Location
    Brooklyn, New York
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    170
    250-400-600 cfm- different variables require different cfms

  5. #5
    Join Date
    Nov 2010
    Location
    Brooklyn NY- you always know someone from Brooklyn
    Posts
    50
    what is the basis of your question? all posters are correct, but it depends on type of system, static pressure, etc.

  6. #6
    Join Date
    Aug 2002
    Location
    Southern NJ
    Posts
    962
    Liebert CRAC systems go about 700 cfm's per ton......it depends on the application and the Manfacturer's engineering of the system.
    I love to Cook...HVAC is a hobby that pays the bills!

  7. #7
    Join Date
    Aug 2010
    Location
    Fayetteville NC
    Posts
    19
    Yeah, there is no real "direct" answer for this question. There are only rules of thumb for estimations.

  8. #8
    Join Date
    Mar 2003
    Posts
    7,326
    btuh=1.08xcfmxdelta t

    12000=1.08x400x27.78

    1 ton=1.08x desired airflowx desired delta t

    This is for illustration only, and does not reflect actual calculations since it does not compensate for both latent and sensible loads.

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