Everyone, help me figure out this issue with the fan flow! Urgent! !
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Check if the analysis in my picture below is correct. Thank you!
For your analysis, if it is an incompressible fluid (such as a liquid) and temperature has little effect on its density, it is acceptable to use volumetric flow rate； However, for gases (compressible fluids), since the volumetric flow rate is greatly affected by temperature and pressure, using the calculation of volumetric flow rate is not appropriate in this case. It is recommended that you perform the calculations using the mass flow rate of the gas (i.e., based on the temperature, pressure, and volume at each point). For your reference
That’s correct, but for centrifugal fans, the gas is treated as an incompressible fluid. The fan head loss is very low. The volume has hardly changed.
There is pipe loss, and there are pressure changes as the fluid passes through the equipment; when there are pressure changes, its volume changes as well. For your reference
There is definitely a change in volume, but it’s very small. As you said, based on mass flow rate, there’s no change.