The water needs of a small farm are to be met by pumping water from a well that can supply water continuously at a rate of 4 L/s. The water level in the well is 20 m below the ground level, and water is to be pumped to a large tank on a hill, which is 58 m above the ground level of the well, using 5-cm internal diameter plastic pipes. The required length of piping is measured to be 420 m, and the total minor loss coefficient due to the use of elbows, vanes, and so on, is estimated to be 12. Taking the efficiency of the pump to be 75 percent, determine the rated power of the pump that needs to be purchased, in kW. The density and viscosity of water at anticipated operation conditions are taken to be 1000 kg/m3 and 0.00131 kg/m?s, respectively. Is it wise to purchase a suitable pump that meets the total power requirements, or is it necessary to also pay particular attention to the large elevation head in this case? Explain.
The water needs of a small farm are to be met by
pumping water from a well that can supply water continuously
at a rate of 4 L/s. The water level in the well is
20 m below the ground level, and water is to be pumped to
a large tank on a hill, which is 58 m above the ground level
of the well, using 5-cm internal diameter plastic pipes. The
required length of piping is measured to be 420 m, and the
total minor loss coefficient due to the use of elbows, vanes,
and so on, is estimated to be 12. Taking the efficiency of
the pump to be 75 percent, determine the rated power of the
pump that needs to be purchased, in kW. The density and
viscosity of water at anticipated operation conditions are
taken to be 1000 kg/m3 and 0.00131 kg/m?s, respectively.
Is it wise to purchase a suitable pump that meets the total
power requirements, or is it necessary to also pay particular
attention to the large elevation head in this case? Explain.
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