2007-02-21 07:50:23 · 2 answers · asked by nkechimadueke 1 in Science & Mathematics ➔ Engineering
Basically pump efficiency is the ratio of output mechanical power to input mechanical power. Output mechanical power is the volume rate times the input-output pressure difference. Pressures are often expressed as "head", the vertical distance equivalent of pressure.
Note that the efficiency of the motor driving the pump is not a factor of the pump efficiency. The ref. describes efficiency measurements and formulas. You may want to save the diagram and then view it separately to get all the numbers shown clearly.
I don't know what "two kinds" of efficiency you refer to, unless they are the mechanical (pump-only) efficiency and the overall efficiency including the motor.
The actual efficiency of a pumping system is reduced by friction and turbulence losses, which the pump efficicncy alone does not take into account.
2007-02-21 11:16:11 · answer #1 · answered by kirchwey 7 · 0⤊ 0⤋
the best pumps are 95% efficient and can only pull 0.6 bar
2007-02-21 07:53:56 · answer #2 · answered by Jason 2 · 0⤊ 0⤋