10.20 Performance data for a centrifugal fan of 3-ft diameter tested at 750 rpm are

Plot the performance data versus volume flow rate. Calculate static efficiency, and show the curve on the plot. Find the best efficiency point, and specify the fan rating at this point.

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Volume flow 106 141 176 211 246 282 rate, Q (ft/s) Static pressure 0.075 0.073 0.064 0.050 0.033 0.016 rise, Ap (psi) Power output, P (hp) 2.75 3.18 3.50 3.51 3.50 3.22