air pressure drop calculation misleading
Posted: Thu Jun 13, 2013 6:13 pm
Hi admin,
I believe the air pressure drop calculation is a bit misleading. The input I selected was -calculate for Pressure drop, pressure on the pipe start, volumetric flow rate at normal conditions.
If I specify the volume flow, the mass flow is calculated based on 1 bar pressure density. While the density should be calculated from inlet pressure since the inlet pressure is one of the inputs.
It can be simply checked:
qn=0.1 m3/s
w=0.1293 kg/s ( this does not vary whatever is the p1)
In fact originally I thought I found an error, but perhaps it was meant to be like that.
What do you think?
Best regards,
Adam
I believe the air pressure drop calculation is a bit misleading. The input I selected was -calculate for Pressure drop, pressure on the pipe start, volumetric flow rate at normal conditions.
If I specify the volume flow, the mass flow is calculated based on 1 bar pressure density. While the density should be calculated from inlet pressure since the inlet pressure is one of the inputs.
It can be simply checked:
qn=0.1 m3/s
w=0.1293 kg/s ( this does not vary whatever is the p1)
In fact originally I thought I found an error, but perhaps it was meant to be like that.
What do you think?
Best regards,
Adam