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Active Contributor

Join Date: Oct 2011
Posts: 15

# How to Compute Compressor Discharge Flowrate

10/24/2011 10:09 PM

Hi everyone. I would like to ask how to compute the discharge flowrate of a screw-type compressor if its free air delivery is 9.3 m3/min measured at the standard conditions of 1.0 bar absolute inlet pressure, 20 deg C cooling and air intake temperature and nominal working pressure of 7.5 bars. Assuming the actual ambient/intake condition is 1 bar absolute pressure and 35 deg C air intake temperature and nominal working pressure is 6 bars.

Thanks

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Guru

Join Date: Oct 2008
Posts: 40523
#1

### Re: How do I compute the compressor discharge flowrate?

10/24/2011 10:26 PM

I'd ask the compressor manufacturer what formula he uses.

3
Guru

Join Date: May 2009
Location: Richland, WA, USA
Posts: 20095
#2

### Re: How to Compute Compressor Discharge Flowrate

10/24/2011 11:05 PM

At least roughly, PiVi/Ti = PoVo/To. (Ideal Gas Law).

Or, use a table or chart of air properties to equate the mass flow, which is the same for inlet and outlet.

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