Quote:
Originally posted by Acidwrz
Yes i fully agree and understand what you are saying, but why would one not want to run at 11.6a 24.6v and achieve 40*C?
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The reason you would not want to run at 24.6V as opposed to say 18.5V, (75% of Vmax) is that the power consumption of the pelt at 24.6V is 285 Watts. The power consumption at 18.5V would be about 163 Watts.
This additional heat has to be dissipated by the hot side watercooling. The more heat the hotside cooling has to remove the hotter the hotside will get. If the increase in hotside temperature due to the extra power dissipation in the pelt, exceeds the increased deltaT gained by running at higher power, temperatures will actually be worse when running the pelt at Vmax.
Some numbers from the Kryotherm simulator: (80 Watt Heatload, Rh=0.18C/W, Rc=0.1C/W, Rins=1, Ambient=20C)
Pelt Voltage = 24.6V
Hotside Temp = 84.3C
Coldside Temp = 21.8C
deltaT Hot to Cold = 62.5C
Pelt Voltage = 18.5V
Hotside Temp = 62.9C
Coldside Temp = 17.6C
deltaT Hot to Cold = 45.3C
You can see that even though the deltaT for the 24.6V case is higher, the Coldside temperature is lower when the pelt is powered with 18.5V. The optimal voltage to run at will depend on the quality of the hotside cooling.