Ah ok. Gotcha. I still think you would have to do multiple flow measurements or else you would get skewed (pump dependent) results in terms of relative performance. I have another question though.
If you have a constant heat input (a CPU die real or simulated transferring heat to the water through a block) and a completely sealed and insulated reservoir (that contains water and a pump), aren't you going to just constantly add heat to the system until parasitic losses take over? What makes you think this would be a situation that you could easily find an equilibrium value? I would think for equilibrium measurements you would have to have a heat exchanger for the input of heat to come to equilibrium with or else wait REALLY long times (and end up with extremely high water temperatures)?
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