Consider the pump and piping system of Prob. 14–39. Suppose that the lower reservoir is huge, and its surface does not change elevation, but the upper reservoir is not so big, and its surface rises...

Consider the pump and piping system of Prob. 14–39. Suppose that the lower reservoir is huge, and its surface does not change elevation, but the upper reservoir is not so big, and its surface rises slowly as the reservoir fills. Generate a curve of volume flow rate V . (Lpm) as a function of z2 - z1 in the range 0 to the value of z2 - z1 at which the pump ceases to pump any more water. At what value of z2 - z1 does this occur? Is the curve linear? Why or why not? What would happen if z2 - z1 were greater than this value? Explain. Q1581; The performance data for a centrifugal water pump are shown in Table P14–47E for water at 77°F (gpm = gallons per minute). (a) For each row of data, calculate the pump efficiency (percent). Show all units and unit conversions for full credit. (b) Estimate the volume flow rate (gpm) and net head (ft) at the BEP of the pump.