(b) Figure Q5(b) shows the performance curves for a 31 cm diameter centrifugal pump used to pump water when it operates at 1000 rpm. The density of the water is 998 kg/m³. Determine head, capacity and power coefficient at its best efficiency point. (c) Based on Question Q5(b), determine the new head, flowrate and power of the pump if we were to double the impeller speed.

Elements Of Electromagnetics
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ISBN:9780190698614
Author:Sadiku, Matthew N. O.
Publisher:Sadiku, Matthew N. O.
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Question
(b)
Figure Q5(b) shows the performance curves for a 31 cm diameter
centrifugal pump used to pump water when it operates at 1000
density of the water is 998 kg/m³. Determine head, capacity and power
coefficient at its best efficiency point.
(c)
Based on Question Q5(b), determine the new head, flowrate and power of
the pump if we were to double the impeller speed.
Transcribed Image Text:(b) Figure Q5(b) shows the performance curves for a 31 cm diameter centrifugal pump used to pump water when it operates at 1000 density of the water is 998 kg/m³. Determine head, capacity and power coefficient at its best efficiency point. (c) Based on Question Q5(b), determine the new head, flowrate and power of the pump if we were to double the impeller speed.
100%
Efficiency
80
60
80
40
70
20
Head
60
50
100
40
80
30
60
20
40
Horsepower
10
20
1000
2000
3000
4000 5000
Capacity, gal/min
Conversion
1 gal/min = 6.31 x 10-5 m³/s
1 ft = 0.3048 m
1 bhp = 745.7 W
Figure Q5(b)
Head, ft
Brake horsepower
Efficiency
Transcribed Image Text:100% Efficiency 80 60 80 40 70 20 Head 60 50 100 40 80 30 60 20 40 Horsepower 10 20 1000 2000 3000 4000 5000 Capacity, gal/min Conversion 1 gal/min = 6.31 x 10-5 m³/s 1 ft = 0.3048 m 1 bhp = 745.7 W Figure Q5(b) Head, ft Brake horsepower Efficiency
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