Bob Cook <[email protected]> wrote: >
> Most pumps do quite well at converting electrical energy into mechanical > energy. When they do only 35% or 40% conversion they are called > inefficient. > The specifications for this family of pumps says they are ~15% efficient as I recall. That is for the larger ones. This is a small one and the tests show that it is less efficient. > 10.8 watts is considerably below the pumps specified need for power. I do > not think it would operate at this low level. > No, it is not. The specifications for this pump are shown on the side of the pump. I listed them in the paper, on p. 24: Iwaki Co., Magnet Pump MD-6K-N Maximum capacity: 8/9 L/min Maximum head: 1.0/1.4 100V 12W/60Hz, 12W/50Hz Please READ THE PAPER before commenting, for crying out loud. It is annoying that I went to the trouble to give you this information, but you ignore it. 10.8 W is pretty close to the maximum input power of 12 W. Since there is very little resistance from a 6 m tube 1 cm in diameter, it is reasonable to assume the flow rate is 8 or 9 L/min. This is a professional grade pump costing about $100 as I recall, so it probably works according to specifications. > I respectively disagree with Jed's conclusions. I await a independent > confirmation test. > These are not my conclusions. I am reporting facts measured by experiment. You are saying that Fig. 19 does not prove what it clearly does prove. Unless you can point to a reason for this, you have no case. This is not a matter of opinion. - Jed
