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Originally Posted by Reaper_Unreal
Alright, well I've re-done the calculations as suggested, and I've even written a program to find all of the stats for me (I'll post it later if needed). This time, I took loads of points off of the P-Q graphs of each pump, and found the power at each point. I took the average of the powers I had found (not including 0 head and 0 flow). I then took the average of all of the heads, and the average of all of the flows, then found the power that way. I then took the average (not geometric mean) of the two power values I had found to give me my value for power. That's about as accurate as it'll get. I've got here the results for the 5 pumps I did. The program I wrote will be posted later if requested when I can find somewhere to host it.
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Nice work - but - pump efficiency is always expressed as a value relative to a point on the PQ curve. It is never an "average" of the points of efficiency. What you've done is expressed an overall summary of various pump's efficiency, but it says nothing at all for how efficient a particular pump is at some point of the PQ curve.