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Originally posted by myv65
OK, so we're left with the "useful" work produced by the pump, namely volumetric flow rate multiplied by pressure rise over the pump.
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Remember that there will also be a change in kinetic energy of the fluid if the suction and discharge lines are different sizes.
I assume you're quite familiar with the Bernoulli equation?
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Energy can come and go in various forms, but what comes in must get back out eventually. Knowing this, figure out how it can get out. For all practical purposes, all of it goes in through electricity to the pump.
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Where else can energy enter the system if there is no CPU heat load?
Alchemy