Re: How much pump is enough? How much is too much?
off the top of my head and really badly remembered and probably wrong:
A really bad pump as a peak eff of about 9%
A normal cheaply made pump eff of 30%
a well made cheap pump with 2D rotor is 40%
To get over 60% you need a 3D CNCed machine piece of kit.
My old lecturer used to have a turbo compressor in his office ( 1/4 million plus RPM for pumping air) i think he said that it was 96% eff but it looked like it cost at least $100 to machine and air is alot easier to move than water.
It is easy to make a cheap pump that performs good enough with injection moulding. The complex shaped air turbos are hard as nails to make.
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