Control and simulation - Coursework Example

is equilibrium position is hard to achieve as their always remains a difference among the two values owing to the mechanical and personnel errors in conducting the experiment and taking readings. Considering the efficiency and flow rate curve; here the efficiency of the pump (E) first increases and then after a point, it starts decreasing. The similar pattern and shape as seen in characteristic curve in graph. This happens because calculation of efficiency includes division of hydraulic power by the mechanical power.

First, when the mechanical power of the pump remains below the hydraulic power the efficiency increases. But as time passes, the mechanical power increases and exceeds the hydraulic power value and thus the efficiency starts decreasing. Thus, the curve first shows a rise and then a decline. These graphs also give an idea about the pump capacity at which the pump would be most efficient. The value of flow rate at which the efficiency is highest or the value one step less than the point at which the efficiency starts falling is the peak value and corresponding most productive flow rate of the pump.

Clearly with increasing flow rate, elevation head remains constant, velocity head increases and the static head decreases also the energy lost to friction increases which in all decreases the total head of the pump. The BEP values are known by interpolating the E-Q curve at varied pump speeds, which is further used to make performance curve of the pump at that speed. These performance curves can be plotted by varying the flow rates and also by varying the diameter of the inlet pipe and then compare the curves obtained with the standard ones.

The performance curves play a crucial role for the pump manufacturers who can actually analyse the working of their pumps from these curves and any deviations found are appropriately followed by complementing improvements in the pump