Tek-Tips is the largest IT community on the Internet today!
Members share and learn making Tek-Tips Forums the best source of peer-reviewed technical information on the Internet!
-
Congratulations MintJulep on being selected by the Eng-Tips community for having the most helpful posts in the forums last week. Way to Go!
SCFM vs ACFM
- Thread starter Matador
- Start date
- Thread starter
- #4
Visiting the above given threads would have cleared your confusion.
Actually, the equation for conversion of ACFM to SCFM is
ACFM = (SCFM x Pstd x T)/[(P-Psat*RH)x Tstd]
Where, P and T are actual pressure and temperature in psia and Rankine respectively, Psat is the saturation pressure of water vapor at the actual temperature and pressure conditions. Pstd is standard pressure, 14.696psia and Tstd is (460+60)R.
A general standard condition is at 60F temperature, 14.696psia pressure and 0%RH but there are some different values across globe.
When you calculate SCFM these are the things you should consider. However, if you are trying to calculate FAD(free air delivery) then atmospheric pressure comes into picture.
Regards,
Actually, the equation for conversion of ACFM to SCFM is
ACFM = (SCFM x Pstd x T)/[(P-Psat*RH)x Tstd]
Where, P and T are actual pressure and temperature in psia and Rankine respectively, Psat is the saturation pressure of water vapor at the actual temperature and pressure conditions. Pstd is standard pressure, 14.696psia and Tstd is (460+60)R.
A general standard condition is at 60F temperature, 14.696psia pressure and 0%RH but there are some different values across globe.
When you calculate SCFM these are the things you should consider. However, if you are trying to calculate FAD(free air delivery) then atmospheric pressure comes into picture.
Regards,
- Thread starter
- #6
I did read the threads and called the compressor supplier yesterday. The compressors in question were purchased from Sullair and what they call standard conditions are 14.5 psia, 68 F, and dry conditions which i assume to be 0 % RH. There is no mention of the altitude being at sea level.
It seems to me they are mixing numbers, They use atmospheric pressure but dry to me signifys a condition after the air dryer.
The actual line conditions after the air dryer are known. I'm trying to determine the difference between the nameplate capacity and the actual. Once I determine the reserve capacity, then I have to size a larger receiver to keep the second compressor from loading and unloading continiously.
It seems to me they are mixing numbers, They use atmospheric pressure but dry to me signifys a condition after the air dryer.
The actual line conditions after the air dryer are known. I'm trying to determine the difference between the nameplate capacity and the actual. Once I determine the reserve capacity, then I have to size a larger receiver to keep the second compressor from loading and unloading continiously.
- Status
Similar threads
- Locked
- Question
- Locked
- Question
- Locked
- Question
