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Testing Undervolt TEC Air cooled - Page 3

post #21 of 27
nice work! I'll see what I can do... The ram, blue orb, peltiers and the matierial im building my case from are still in the mail.

Nice PSU by the way! stack em high! The case im building will use them inside the case.
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post #22 of 27
Quote:
Originally Posted by dizzy4
I've been watching these threads and have ordered some TECs and stuff. I'll be going the air cooled route and I think I have figured a way to run the TECs on 12v and keep them powered up.

Coolers im using:
CPU: Thermaltake Blue Orb II on top of a 95watt TEC
GPU: Zalman zf900cu on top of another 95watt TEC

My main goal is a system that is more portable than most of these monstous rigs with water cooling and 5 PSUs. Im also using all ATX power
You'll probably be disappointed using those peltier units. The key to pelting is using an oversized peltier and running it on very low voltage to keep the efficiency up. Running those 95 watt TEC's at "full power" will produce a LOT more heat while pumping less than a 227w peltier running on, say, 7 volts or so.
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post #23 of 27
yes, it may run on 7 volts, but it takes more power to do so. the focus is to keep it low powered for a good overclock while keeping the whole box somewhat movable. I ordered 4 TEC units. I will eventually use one to cool the other.
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post #24 of 27
No, it won't use more power. In fact, the 227w peltier running on 7 volts will probably produce less than a 95w peltier running on 12 volts. Plus, if you find that your heatsink can't handle the power, you can turn it down to 5 volts.
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post #25 of 27
if you run less power through a higher power TEC isnt it just like using a lower power one? Or is there a relative efficiency of the device like there is in PSUs and some other electronics?

By the way, volts dont = power draw. you need amps to help calculate that
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post #26 of 27
A peltier's amperage draw and power usage is not linear. Higher powered peltiers running at low voltage are much more efficient than lower powered units running at their full rated voltage.

Here's a few charts from the Hardware Asylum Forum.

Quote:
80 watt / 16.1 VMax / 8.0 IMax
5 volts: 5.7 watts; 2.48 amps
6 volts: 8.9 watts; 2.98 amps
7 volts: 12.8 watts; 3.47 amps
8 volts: 17.4 watts; 3.97 amps
9 volts: 22.8 watts; 4.47 amps
10 volts: 28.8 watts; 4.96 amps
11 volts: 35.6 watts; 5.46 amps
12 volts: 43.0 watts; 5.96 amps
13 volts: 51.2 watts; 6.45 amps
14 volts: 60.1 watts; 6.95 amps
15 volts: 69.7 watts; 7.45 amps
16 volts: 80 watts; 7.95 amps

120 watts / 24.6 VMax / 7.9 IMax
5 volts: 3.5 watts; 1.60 amps
6 volts: 5.5 watts; 1.92 amps
7 volts: 8.0 watts; 2.24 amps
8 volts: 10.8 watts; 2.56 amps
9 volts: 14.1 watts; 2.89 amps
10 volts: 17.9 watts; 3.21 amps
11 volts: 22.1 watts; 3.53 amps
12 volts: 26.7 watts; 3.85 amps
13 volts: 31.0 watts; 4.17 amps
14 volts: 36.4 watts; 4.49 amps
15 volts: 42.2 watts; 4.81 amps
16 volts: 48.5 watts; 5.13 amps
17 volts: 55.2 watts; 5.45 amps
18 volts: 62.3 watts; 5.78 amps
19 volts: 69.8 watts; 6.1 amps
20 volts: 77.8 watts; 6.42 amps
21 volts: 86.2 watts; 6.74 amps
22 volts: 95.0 watts; 7.06 amps
23 volts: 104.3 watts; 7.38 amps
24 volts: 114.0 watts; 7.70 amps
Just as an example, you will notice that in the first peltier unit, in order to pump 80 watts, the peltier draws 7.95 amps. In the 120 watt unit, in order to pump 86.2 watts, it only requires 6.74 amps. The larger unit can move more heat while producing less heat of its own.
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post #27 of 27
oh thats awesome! thanks for the info! ill be upgrading my peltiers soon then
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