Pump Calculations
A farmer uses a centrifugal pump to pump the river water to a storage tank located in his farm 20 m above the river . If the water is filled in the tank at the rate of 15 L/s and frictional losses in the pipe is 0.5m. Calculate how much extra he has to pay for his monthly electricity bill (30days) while running the pump for 6 hours daily. The motor and pump efficiency is 70% and cost of electricity is 38 c /KWH.
can any one briefly explain how to do this problem?????
can any one briefly explain how to do this problem?????
Replies
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Ammar Azizplease describe frictional losses in correct units -
Ramani Aswath
That is the correct unit. Head of water in metres.Ammar Azizplease describe frictional losses in correct units -
Ammar Azizbut sir please explain me that what is the meaning of o.5m frictional losses
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Ramani AswathIf you look at the Bernoulli's equation, everything is converted into equivalent height of liquid column. In the present case, the 0.5 m is about 2.5% of the differential head of 20 meters. The implication is that the pump is raising the water not by 20 m but by 20 m + 0.5 m (friction head). In effect the pump consumes proportionately that much more power.
Incidentally, this is not included in the pump efficiency. That is a separate issue. -
Ammar Aziz
Thank You SirbioramaniIf you look at the Bernoulli's equation, everything is converted into equivalent height of liquid column. In the present case, the 0.5 m is about 2.5% of the differential head of 20 meters. The implication is that the pump is raising the water not by 20 m but by 20 m + 0.5 m (friction head). In effect the pump consumes proportionately that much more power.
Incidentally, this is not included in the pump efficiency. That is a separate issue.
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