Problem 2. Performance data are given in the table below for a centrifugal pump with an impeller diameter of D = 9.0 inches operating at a speed of N = 1750 rpm collected on a pump test stand using water at STP. For this pump test there are no changes in elevation or velocity between the suction inlet and pump discharge. (a) Plot the actual pump head and pump efficiency versus flowrate. (b) Use a curve fit to obtain a pump curve, H₂ = H0 - C₂ Q². (c) Use a curve fit to obtain a 2nd order polynomial fit for the efficiency curve. (d) Calculate the best efficiency point. Q (gpm) 20 40 60 80 100 120 140 Ap (psi) 40.2 40.1 38.1 36.2 33.5 30.1 25.8 Wm (hp) 1.58 2.27 2.67 2.95 3.19 3.49 4.00

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Chapter10: Heat Exchangers
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Problem 2. Performance data are given in the table below for a centrifugal pump with an impeller diameter of
D = 9.0 inches operating at a speed of N = 1750 rpm collected on a pump test stand using water at STP. For
this pump test there are no changes in elevation or velocity between the suction inlet and pump discharge. (a)
Plot the actual pump head and pump efficiency versus flowrate. (b) Use a curve fit to obtain a pump curve,
H₂ = H0 - C₂ Q². (c) Use a curve fit to obtain a 2nd order polynomial fit for the efficiency curve. (d) Calculate
the best efficiency point.
Q (gpm)
20
40
60
80
100
120
140
Ap (psi)
40.2
40.1
38.1
36.2
33.5
30.1
25.8
Wm (hp)
1.58
2.27
2.67
2.95
3.19
3.49
4.00
Transcribed Image Text:Problem 2. Performance data are given in the table below for a centrifugal pump with an impeller diameter of D = 9.0 inches operating at a speed of N = 1750 rpm collected on a pump test stand using water at STP. For this pump test there are no changes in elevation or velocity between the suction inlet and pump discharge. (a) Plot the actual pump head and pump efficiency versus flowrate. (b) Use a curve fit to obtain a pump curve, H₂ = H0 - C₂ Q². (c) Use a curve fit to obtain a 2nd order polynomial fit for the efficiency curve. (d) Calculate the best efficiency point. Q (gpm) 20 40 60 80 100 120 140 Ap (psi) 40.2 40.1 38.1 36.2 33.5 30.1 25.8 Wm (hp) 1.58 2.27 2.67 2.95 3.19 3.49 4.00
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