For the calculation of the air pressure in a centrifugal fan, should the density be based on the inlet pressure or the outlet pressure?
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HT = p2 – p1 + density × (velocity squared) / 2
The pressure of the fans is very low; there is little difference between the inlet and outlet
But this density multiplied by the square of the velocity, and that velocity is the exit velocity
If the pressure difference between the inlet and outlet of the compressor is large, can its air pressure also be calculated using this formula?