dixson01974

Is it possible to use mult peliters to cool cpu with direct die ?
Like these at 50% power .
40mm
Qmax : 225 watts
Imax : 15.5 amps
Vmax : 24 volts

ChielScape

a few threads down is already a question asking a very similar thing.
http://www.overclock.net/peltiers-te...-cool-cpu.html

why dont you take a look around first?

but for those TECs in specific, you'll need a good few if you wanna run em at 50%

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dixson01974

I'm throwing out thoughs for setup . If my wc can't handle the speed I want them I'm going with stage two TEC cooling . I'm looking at the best possible way the cool the cpu with tec . People told me about 30 - 35% is the sweet spot not 1 tec can give me that spot . I'm going to use about 230w - 300w of heat from the cpu . So if I use tec . I need mult tec to the sweet spot . Here is though on a new with mult tec .

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ira-k

When you stack TEC's (cascade) the second TEC will have to cool the CPU and the first TEC's heat-load. I've heard of a few guys using a 437W direct die then a big hot plate over the first TEC with 2 more 437W cooling the chip and first pelt. I'd hate to see the electric bill from it and you still wouldn't be able to hold mush below 0C load with it.

I always just run a few volts below my TEC's max voltage, 15vdc at around 12v and 437W around 21 volts. I don't care how efficient it is I just want to get decent cooling.

To hold one at load around 0-5C I need around 2-3 times more TEC wattage (Q) then my heat load. So with a 200+ heat load you are going to have a tough time cooling it down. A TEC cascade really isn't the way I'd do it. By the time you bought all the gear to make one you would be able to go phase.

You could do a direct die 437W at 21vdc or so, it would be pointless to me though if you couldn't get it much cooler then plain WC'ing, you wouldn't be able to OC it much higher either.

Make a slush-box chiller out of a 5000BTU window AC or a 25 quart a day de-humidifier and you could keep your whole mobo below 0C.

EDIT: Forgot this link...Ok, I'm Chilled. I'm Chilled. Relax....56K Warning!

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dixson01974

TEC's are not cascade . The setup is wc block>copper plate>4 TEC's>copper plate>cpu .

ira-k

Of course there a cascade if you stack them, so is phase when you have multi-part stages. But I see what your saying now you just want a hot plate and a cold plate with 4 TEC's sandwiched between them side by side instead of stacked.

Try it and see. Get 4-437W, 4-PSU's then build a heck of a loop and a giant CPU block to cover most of that hot plate and see how it does.

You could use a couple of 437W and run them at a higher vdc and it might cool OK, your just going to have a heck of a electric bill for mediocre temp's.

TEC's just aren't meant for high heat dump chips. You can do it if you want to spend enough money, but there are a lot cheaper and more effective cooling solutions for the same or less money.

This will give you a real decent TEC education..Melcor - Thermoelectric Handbook .

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...***Beware all ye Men born of Woman, beware the Hemogoblins***...
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dixson01974

That is why I want to use 4 TEC's (Qmax : 225 watts) at 50% power it would equal about 450 watts of cooling power . And find some non conductive cooling gel . Or chiller water system . It depending if I find some non conductive cooling gel .

ira-k

You can make something like that but you'll need a good sized block to cover your hot plate, you'll need a hot plate and cold-plate with 4 TEC. You need between 150-300PSI pressure on your TEC's for good performance. Properly crushing your TEC like that can give you around 15% better cooling.

If you want a chiller why not just make one out of a window AC? It will cool better and not cost nearly as much.

__________________
...***Beware all ye Men born of Woman, beware the Hemogoblins***...
**E8600 @ 5751Mhz ***OCN Water Cooling Club And Picture Gallery ***150 Opty @ 3242Mhz **

dixson01974

I have 2 radiator (480mm and 240mm with fans) , 1 pump (MCP 355), 1 cpu block and 2 peliter (235w 52mm and 95w 40mm) . I can git 2 blocks for 4 40mm TEC ( hot and cold ) for water chiller . Water block come in 65mmx65mm , 90mmx90mm and 132mmx132mm . So water chiller would be easier to build for me . Plus about $250US more to build .

ira-k

Yeah that makes more sense since you already have the gear for it. Just try it and see, that's the only way you'll ever know for sure how it will do. Play around with it a little. If you don't already have a PSU you can make one real easily out of a ATX PSU with at least 25 amp on the 12 volt rail, I've been using a modded one for all my low voltage TEC's for a couple of years now and its still going strong. Once you play around with it a little and see if you like it or not a MeanWell is a good TEC PSU. I get mine from here..Power Supply, Power Supplies,

I like to use relays on my PSU's to come on with the comp PSU, there is a little wiring guide in my sig. I like the Crydom relay, you can see the model # in the guide pic's. You can get them from eBay for around $10.

Just take you time setting it all up and have some fun playing with it. TEC is really pretty easy, you just need to be a little more careful with it then WC'ing. When your holding your TEC with the red tail towards the left the top should be hot side. Always check, I've never gotten one that wasn't wired that way but I've heard from a few who have. You can mark the hot and cold side with a pencil in the corner or something to keep them straight at first. Just hold the TEC between your thumb and finger and power it for a couple of seconds to find hot and cold side. It wont hurt the TEC as long as its just powered for a second or two. It will get hot so be careful.

Be sure to set a fairly low CPU shut down temp in bios. There is a good condensation proofing guide in the stickies if you think you'll go sub-ambient.

__________________
...***Beware all ye Men born of Woman, beware the Hemogoblins***...
**E8600 @ 5751Mhz ***OCN Water Cooling Club And Picture Gallery ***150 Opty @ 3242Mhz **