Engineering, 26.03.2021 05:30 jahnoibenjamin
A pump with a power of 5 kW (pump power, and not useful pump power) and an efficiency of 72 percent is used to pump water from a lake to a pool through a constant diameter. The free surface of the pool is 25 m above the free surface of the lake. If the irreversible head loss in the piping system is 4 m, determine (a) the mass flowrate of water and (b) the pressure difference across the pump.
Answers: 3
), in kilograms per second, is determined by following formula:
(1)
- Pump power, in watts.
- Efficiency, no unit.
- Gravitational acceleration, in meters per square second.
- Hydrostatic column, in meters.
, 
, 
and 
, then the mass flow rate of water is:
), in pascals, is determined by this equation:
(2)
is the density of water, in kilograms per cubic meter. 
, 
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A pump with a power of 5 kW (pump power, and not useful pump power) and an efficiency of 72 percent...
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