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Unit Conversion

 
 
Reply Thu 18 Jun, 2015 07:45 am
How do you convert from lbs/hr to SCFM given the following for an air compressor (all parameters may not necessarily be used):
flow: 325,510 lbs/hr
Inlet pressure: 14.402 PSIA
Inlet temp.: 95F
Medium: Air
Mol weight: 26.68 lbm/lbm-mole
Gas constant: 53.879 ft lbf/lbm R
Relative humidity: 45%
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raprap
 
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Reply Thu 18 Jun, 2015 04:14 pm
@arsene2conde,
Determine the density of air at standard conditions in pound per Standard cubic foot. Standard condition are , I believe, 1 tatm pressure and 60 degF.
Hint use ideal gas law
SCFH is 325,000 (lb//hr)/Sden (lb/ft^3)

SCFM is SCFH divided by 60 (min/hr)
v
v
v
v
v
v
v
v
v
v
Standard density is about 0.08 lb/ft^3
SCFM is then about 68,000

Rap
arsene2conde
 
  1  
Reply Fri 19 Jun, 2015 12:27 pm
@raprap,
Thank you Rap!
As for the relative humidity, etc...we don't take into consideration because that's already included in the flow, correct?
the 325,000 lbs/hr already takes into consideration all of these parameters that I have listed...
I thought somehow the gas constant would have to be used.
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