That was a 590 watt run.
The wierd thing I'm noticing is the time to equilibrium is not really heat based as much as it is the Delta and the volume of water in the test system.
I also ran an 200 watt load that took just as long because the delta was high from running very low 400RPM fans.
My reservoir for the heaters is a 4" x 24" piece of PVC, so when I add up the volume from my heater reservoir AND the large radiator, it's well over a full gallon of water in my test loop.
I have found that you can speed up the heatup process by estimating the delta from previous runs and heating the loop without fans first....just don't forget about it
I think ideally for this delta T testing you want the bare minimum of water volume. That and simply alot of time and leave the room and come back in a couple of hours for a really good run. My data points are falling on the trendlines much more accurately with this run. Now instead of stopping the logging run, I simply copy the file over to another and open it, plot the run and check to see if it's good enough to stop before I stop it.
I just wish there was a way we could automatically log and plot the temps on the crystalfontz. I'm sure it could be done if someone had the programming expertise.
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