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  • Pump Calculations

    Khartz Di

    Member

    Updated: Oct 27, 2024
    Views: 1.2K
    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?????
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Replies

  • Ammar Aziz

    Member • Sep 28, 2012

    please describe frictional losses in correct units
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  • Ramani Aswath

    Member • Sep 28, 2012

    Ammar Aziz
    please describe frictional losses in correct units
    That is the correct unit. Head of water in metres.
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  • Ammar Aziz

    Member • Sep 28, 2012

    but sir please explain me that what is the meaning of o.5m frictional losses
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  • Ramani Aswath

    Member • Sep 28, 2012

    If 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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  • Ammar Aziz

    Member • Oct 1, 2012

    bioramani
    If 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.
    Thank You Sir
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