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Since87 quote: Originally posted by Gooserider "Water Cooling Flow Rate and Heat Transfer" Zhentar, see the bottom part of this one, it addresses your comment about pump heat. (sorry, you got it wrong...) Yes, all the power going into the pump in a closed loop system exits the pump as heat. (The proportion that exits through the pump casing and through the water will vary depending on the system.) Only in a system where water is pumped from one location to another, is power exiting 'the system' in the form of kinetic energy.
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Off the immediate topic, but another way to look at it is from an 'overcoming friction' viewpoint. This has the advantage of applying to the power consumption of HDD's as well. In the ideal 'Newtonian perpetual motion universe' once we got our disk drive spinning, or our coolant circulating, they would continue to do so as long as we didn't do anything to stop them, and without further energy input.
However, we have the problem in this universe of friction, which will make our coolant stop flowing, and our drives stop spinning UNLESS we keep constantly putting energy into them. Friction expresses itself as heat.
Thus the power of the pump, or the HDD is really the amount of energy which must be constantly added to replace the heat losses caused by friction. This means that those power numbers show up as HEAT in the system, which must be dissipated. In a WC system, that heat ends up in the radiator...
Gooserider