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TEC in Series or Parallel? - Page 2

post #11 of 19
so you connected them at 12 volts each ? if so you really should try 7 volts you'll get much better temps

1 water cool the hot side. Bin the 80 watt tecs for 40x40 172 watt versions
2 yes one tec to each cooler
3 no i wouldn't do that

by the way in therory you've only got a max of 240 watts Qmax so that's not that much these days
post #12 of 19
damn, i GOTTA get me some of those units
post #13 of 19
Thread Starter 
Quote:
Originally Posted by ChielScape View Post
damn, i GOTTA get me some of those units
The eliminators? They are 99 dollars now refurbished at http://coolitsystems.com/ (its a discontinued product)

I will try to hook them up again (at a lower voltage) after class today (calc quiz ). With all the TEC hooked up in parallel, my load temps were about 5-8 degrees worse than before (my room was somewhat warmer though).

By the way, despite a bit of warping of the 92mm fan due to the heat, everything still works. That bulge now looks like a deflated balloon but it doesn’t inflate when the pump is running so I think I am fine there although I will probably replace it eventually.

1. Will I still need the second power supply with the TEC hooked up the 5/7 volt rail?
2. Would it be beneficial (since I will eventually have to mess with the tubing anyway now) to hook a radiator up in between the CPU and the TEC so that hot coolant leaving the CPU is first cooled by the radiator before being chilled by the TEC?
Edited by digital charon - 2/6/09 at 9:57am
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post #14 of 19
1 i dont know that depends on the exsisitng load on the psu
2 if the water temp goes above ambient at load then there would be some benifit to this . however the RAD will prevent the water from going below ambient by much which pretty much defeats the point of having a tec cooling system.

IF I WERE YOU id buy a second eliminator and plumb them together giving twice the cooling.
post #15 of 19
Quote:
Originally Posted by digital charon View Post
The eliminators? They are 99 dollars now refurbished at http://coolitsystems.com/ (its a discontinued product)
well any coolit unit really... just passively looking for one close to me for cheap
post #16 of 19
Thread Starter 
Small update:

I had about an hour in between calc class and calc lab so I put the TEC on the 5 volt rail (picture attached) by switching the yellow and red wire on the first Molex connector (I hope not switching grounds won’t have a negative effect but I don’t think it should). Turned on the computer, loaded up prime95 and after 10 minutes (had to go to class after that) temperatures were at 46-45-41-46. The heatsink was right above ambient temperature. Wires were also not as hot as before.

I will try 7v when I have more than an hour to get from class to my apartment, do the mod, and get back to class (Also I assume this is the mod involving switching the ground out for the 5v so that it goes from 12 to 5, right?)

LL
Edited by digital charon - 2/6/09 at 1:34pm
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post #17 of 19
pos is 12+ neg is 5volt +
post #18 of 19
The result at 5v indicates a high temp delta. with a high temp delta the current draw was low enough for the molex.

You are still wiring in parallel, right?

It will be interesting to see if the heatsink is good enough for 7v if not you will run into problems with the high temp delta, you might get "heat cycling" and the ultimate demise of the TEC's.
post #19 of 19
Thread Starter 
The auxiliary power supply I have refuses to work if I try and use 7 volts on it, so I plugged two TEC in at 7 volts into the 630watt and had 1 TEC in at 12 volts to the 450watt. Temperatures were nice (see attached screenshot taken via remote desktop 6 feet away). In that setup, I could stress the CPU indefinitely but the powers supply test in the OCCT program made it go over the limit. I am currently trying two 12 volts hooked up to the auxiliary power supply and one 7 volt on the main power supply. This setup doesn’t shut down under the OCCT power supply test but definitely no decrease in load temps (not done stress testing in prime95 to do a decent comparison but it has hit 40 earlier than before)
LL
Edited by digital charon - 2/6/09 at 5:25pm
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