ME309_Fall11_HW10_soln

# ME309_Fall11_HW10_soln - Solution /~. H.e.wJ ~ ~ p~. 0'...

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Problem 1 Consider a pump operating at its best efficiency point delivering a head rise of water of H = 10m for a flow rate of Q = 0.725 m 3 /s . The pump has a diameter of 500 mm. If the specific speed of the pump is 1.74 and the required input power is 90kW, determine the shutoff head, Ho, and best efficiency, η . If the pump is now run at 900 rpm, scale the performance curve to determine the new flow rate, head, and required power. Solution

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Problem 2 At its best efficiency point (h=0.87), a pump with D=400mm delivers Q=0.5 m 3 /s of water at H=11m when operating at n=1400rpm. Calculate the specific speed of the pump and estimate the required power input. Determine the curve fit parameters (in the form H=H 0 -AQ 2 ) of the pump performance on the basis of the shutoff point and the best efficiency point. Scale the performance curve to estimate the flow, head, efficiency and power input required to run the same pump at 820 rpm.

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## This note was uploaded on 02/13/2012 for the course ME 309 taught by Professor Merkle during the Fall '08 term at Purdue University-West Lafayette.

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ME309_Fall11_HW10_soln - Solution /~. H.e.wJ ~ ~ p~. 0'...

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