Stacking TECs for effeciency - Page 2 - Overclock.net

Ihatethedukes · 10-07-07

You'd buy three pelts of ascending power, and stack them thus, CPU->100W->150W->300W->waterblock. Assume that all three are 12V, you'd undervolt all of them to the same voltage and tune from there.

IwubAMD · 10-07-07

Quote:

Originally Posted by Ihatethedukes

You'd buy three pelts of ascending power, and stack them thus, CPU->100W->150W->300W->waterblock. Assume that all three are 12V, you'd undervolt all of them to the same voltage and tune from there.

can you explain why they would have to be seperate wattages though, that doesnt make sense to me unless your trying to increase your bottoms ones coldside

thats NOT what im trying to do, im trying to achieve the same cold side temp as a single TEC would

but simply spreading out the cooling between 4 TECs that are running lower volts than a single TEC at higher volts, therefore running each TEC in a much more effecient slot decreasing total power consumption

IwubAMD · 10-07-07

Quote:

Originally Posted by Zach.Reliford

IWubAMD, even though you DO have an insanely nice PC/CAR!

yea shes a beauty, you should see the dyno, torque is from 1500 rpms so it basically accelerates like a bat out of hell from a stop when most cars dont reach that acceleration till 3-5k rpms

**RyGuy** · 10-07-07

Ihatethedukes basically re-stated what I said about stacking a pyramid type.

You can't stack pelts of the same wattage because it creates a giant heat-dump since each pelt gains heat in the form of the CPU load (cold side) as well as the power it consumes.

Like I said before, if you stack them all at the same voltage it would be even more inefficient than before because of the added heat-dump of each pelt's power supply.

To counter this, you would have to turn the voltage up on each successive pelt, eliminating the main goal of using less power in the first place.

PS: If you let the pelts all run at the same voltage like that, the heat will rapidly build up inside and the pelts will get wrecked, which is why I said you would wreck the pelts in my first response.

Ihatethedukes · 10-07-07

It's kind of like having three water pumps in series in your water cooling loop. Water(heat) is not getting pumped faster, but you have THREE pumps dumping heat into your loop instead of one.

If you lead with a super strong pump, and follow it up with two weak pumps you wind up having LESS flow than just the strong pump because it winds up having to FORCE water through the weak pumps since they lag behind in pumping capacity. PLUS you get the heat dump for three pumps into your loop.

Now, if you get the weakest pump first, then a stronger pump then the strongest pump you'll get a more pressure and flow than just one pump. The first pump speeds up the water, the next one speeds it up more and the last even more. The same things apply to your peltiers.

The first peltier takes the CPU energy+the power it uses and transfers it all to the hot side,the NEXt peltier has to be able to move ALL of the first peltier's hotside energy PLUS its own power usage to it's hotside and so on

CPU->P1+cpu->P1+P2+cpu->P1+P2+p3+cpu->water block

See why you need to increase voltages across each peltier? More heat is generated at each pelt and each stacked pelt must have more volts to take care of that heat dump.

IwubAMD · 10-07-07

Quote:

Originally Posted by RyGuy

Ihatethedukes basically re-stated what I said about stacking a pyramid type.

You can't stack pelts of the same wattage because it creates a giant heat-dump since each pelt gains heat in the form of the CPU load (cold side) as well as the power it consumes.

Like I said before, if you stack them all at the same voltage it would be even more inefficient than before because of the added heat-dump of each pelt's power supply.

To counter this, you would have to turn the voltage up on each successive pelt, eliminating the main goal of using less power in the first place.

ok one last time let me try and explain this to you, each TEC at a lower voltage will have less of a "heat dump" so the total "heat dump" is actually going to be lower than a single TEC at higher voltage, so the total "buildup" of extra heat should be LESS than a single TEC at higher voltage

if you would read through any of those posts you would see ive said this 3 or 4 times now, hopefully using your vocabulary will make it clear this time

IwubAMD · 10-07-07

Quote:

Originally Posted by Ihatethedukes

It's kind of like having three water pumps in series in your water cooling loop. Water(heat) is not getting pumped faster, but you have THREE pumps dumping heat into your loop instead of one.

If you lead with a super strong pump, and follow it up with two weak pumps you wind up having LESS flow than just the strong pump because it winds up having to FORCE water through the weak pumps since they lag behind in pumping capacity. PLUS you get the heat dump for three pumps into your loop.

Now, if you get the weakest pump first, then a stronger pump then the strongest pump you'll get a more pressure and flow than just one pump. The first pump speeds up the water, the next one speeds it up more and the last even more. The same things applies to your peltiers.

alright now how about 3 of the same pumps in a series, thats going to create more flow

now how about 3 pumps in a series at 1/3 their wattage, thats going to increase flow as well, it doesnt work when you say pumps because thye dont have the same characterisitcs as TECs though

**RyGuy** · 10-07-07

It is clear neither of us understands each other, so I am done trying. If you want to spend the money to buy 4 pelts and the power supplies to go along with them and try it, be my guest.

IwubAMD · 10-07-07

Quote:

Originally Posted by RyGuy

It is clear neither of us understands each other, so I am done trying. If you want to spend the money to buy 4 pelts and the power supplies to go along with them and try it, be my guest.

would only need one series* wiring FTW