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THE STARK REALITY |
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 Fan air volume vs. Standard air volume
Welcome to the March issue of MSP technology.
Ever wonder about the difference between CFM (Cubic Feet/Minute) and SCFM (Standard Cubic Feet/Minute)? And how they relate to air handling systems? The term CFM identifies the air volume delivered by a fan. But CFM without its associated temperature and altitude is incomplete data.
The term SCFM is clearer because it is defined as “CFM adjusted to standard air conditions of 68°F at sea level.” Nevertheless, fans move only CFM, regardless of temperature. As air temperatures entering a fan vary, so does its density and SCFM; but the fan’s CFM remains constant. For this reason, locating a fan in an airstream with stable temperatures will result in more consistent air volume.
For example, on a 100% outside air system, if the fan is in the “push-through position” in relation to the heater, the fan is exposed to raw outside air conditions. On the other hand, if the fan is in the “pull-through position” in relation to the heater, the fan is exposed to relatively stable temperature conditions and will deliver more consistent air volume.
A fan designed to deliver 10,000 SCFM at 70°F will deliver 11,659 SCFM at 0°F, a whopping increase of 16.6%. The fan power and heat energy associated with this increase should be considered.
Conclusion: If a fan must be placed in an airstream with unstable temperatures, consider a variable frequency drive or other means to automatically adjust the air volume as the temperature and density varies.
Reps wanted in strategic geographical areas. Please call us at
631-424-7542, or email us for more info. |
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| MSP® DEHUMIDIFYING COILS |
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| MSP® PLATE HEAT EXCHANGERS |
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Reps wanted in strategic geographical areas. Please call us at 631-424-7542, or email us for more info. |
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| MSP Technology was started in 2001 by Walter Stark soon after receiving patents on a revolutionary form for applying small plate heat exchangers to the dehumidifying and energy recovery processes. This technology is licensed to qualified OEM's.
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