[Review] Round 2: EK Supreme HF

[jayhall0315]

You can tell the difference between a channel that's <1.5mm deep and ~2.0mm deep without measuring? I'm suggesting that your Supreme HF doesn't have channels that are as deep as mine--a manufacturing variance (or flaw, depends on what spec is). Mine are 1.9-2.0mm deep, it's not very easy to measure with a lot of precision considering how narrow the channel is and considering the bottom surface of the channel is not flat. Slightly shallower channels would explain all our discrepancies in performance.

And as a matter of fact, I do know that the restriction of my two flowmeters + three 'off' pumps is higher than the restriction of a PA120.2 + a moderate amount of tubing (at least at all flowrates above .25GPM...below that I don't have any viable data). I also know, because I've measured it, that when flowrate through the block subloop (Subloop1) is anywhere between .3GPM and 4.1GPM that the flowrate through the radiators is maintained at 1.5GPM within 1% (measurement limitation)

No I did not use a micrometer on it Vapor, but I did look at the bases and no bent channels, depth irregularities, bent pins (on the XT) etc... Simply saying that I think my EK HF is an average sample and representative of other HF's and is not a statistical outlier

Your duel loop should only be 1% variance if your resevoir approaches a large size. At smaller sizes and with your extra pumps on, the fluid pressure going into and exerted on the walls of the resevoir will be higher (the smaller the resevoir the higher the fluid pressure) and this will definitely affect your second loop. The solution to this a second order ODE state space setup and is part of Bernoulli hydrostatics.