Pro/Forums - View Single Post

Since87 · 12-13-2002, 10:37 PM

I plugged some numbers into the Kryotherm calculator, and came up with about 9A current draw for the 172 Watt TEC at 20V and about 7A current draw for the 120 Watt TEC at 20V.

I'm not sure why your results fall in between. I'd guess it's because yours aren't Kryotherm TEC's.

I wouldn't try powering the two pelt's in parallel on that supply. By your own measurements, that would be putting a 16 Amp load on a 15 Amp rated supply.

I really think you ought to try both TEC's connected in series to your supply. You'll get fairly decent cooling even if they are only 120 Watt TEC's. If you can crank the output of your supply up to 28V or so, (14V across each TEC) you should be able to do a little better than at 24V.

TEC's are much more efficient at lower voltage. It appears, that for your system, the TEC voltage for minimum CPU temp is about 16V. You'll only lose about 2.6C going to 12V per TEC. (Only 0.8C at 14V per TEC.)

12-13-2002, 10:37 PM	#5
Since87 Pro/Guru - Uber Mod Join Date: Sep 2002 Location: Indiana Posts: 834	I plugged some numbers into the Kryotherm calculator, and came up with about 9A current draw for the 172 Watt TEC at 20V and about 7A current draw for the 120 Watt TEC at 20V. I'm not sure why your results fall in between. I'd guess it's because yours aren't Kryotherm TEC's. I wouldn't try powering the two pelt's in parallel on that supply. By your own measurements, that would be putting a 16 Amp load on a 15 Amp rated supply. I really think you ought to try both TEC's connected in series to your supply. You'll get fairly decent cooling even if they are only 120 Watt TEC's. If you can crank the output of your supply up to 28V or so, (14V across each TEC) you should be able to do a little better than at 24V. TEC's are much more efficient at lower voltage. It appears, that for your system, the TEC voltage for minimum CPU temp is about 16V. You'll only lose about 2.6C going to 12V per TEC. (Only 0.8C at 14V per TEC.)