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Peltier + Intel 550

post #1 of 8
Thread Starter 
Hi,

First off I am new to this. But I did do several searches and read all of the Peltier stickies.

My question is what size Peltier should I use for an Intel 550 which IIRC outputs about 105 watts. I read that it is more efficent to run one at about 50 percent of its rating and I already have a 12v bench supply, so it would be nice to stick to the 12v peltiers. Now this is the part where I'm going to get flamed: I read several threads and there wasn't a definate yes/no to air cooling a peltier. I have a Zalman CNPS-9500 which the fan blows directly out the exhaust case fan, so it wouldn't heat anything else on the MB. My main goal is to stay around ambient temps. (I also want to make a controller out of a BASIC stamp, a humidity sensor, and two temperature sensors. That way I can calculate the dew point and hover right above that temp.)

Again, thanks everyone
ry.david
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post #2 of 8
If you are NOT looking into going below ambient then you could use a 226 watter which is generally 50 x 50 mm in size and just under power it.

The best way to keep the how side of the TEC cool is with water cooling as air cooling isn't really going to do the job. The only way air cooling might work is if you have it really under powered so it isn't really doing much at all and even then that might not work and it defeats the purpose of this type of cooling.

Is there a reason you don't want to go cooler, is it the condensation and prepping of the motherboard that is stopping you from trying to freeze your cpu?

I myself have had the condensation issues and luckily my mobo is absolutely covered in a layer of clear silicone spray so when there was a problem it would with some luck survive. This is now been pretty much sorted out with a little bit of thinking and ingenuity.

Stepping up to TEC cooling can be expensive if you are looking at doing it properly, your water cooling has to be nothing short of A1 to cope with the heat generated by the peltier itself + the heat from the cpu, a job that no heatsink and fan can do.

I have recently been running a 226 watt peltier and was getting very respectable load temps at my given OC, now I have the 437 watter installed and is producing better results again. Comparing the 226 watt to the 437 watt is like comparing a Mini to a Ferrari. The 437 wins out in handling and pumping the heat very easily.

I hope you choose to go down the peltier path as there is very few of us doing it and seems to be a dying trade as it is hard to source parts sometimes. If you do wish to do this then by all means do it properly, take your time and expect to spend a little bit of money doing so.

There will be plenty of help from overclock.net

There is one peltier cooler available on the market that is cooled by a HSF and I purchased it. The cooler seemed to only lower my load temps by 4-6 degrees with only a minimal ovrclock and no vcore increase where the extra heat comes from. http://www.pccasegear.com.au/prod2134.htm
I don't advise anybody to buy this as it is very underpowered and is only of use for an enthusiast that wants something peltier cooled. Some of the older processors of a few years ago could have benefited from such a kit but not now days and especially your cpu.

TEC parts are available from here. http://www.frozencpu.com/

cheers
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post #3 of 8
Thread Starter 
Thanks so much for the quick reply.

The main reason that I don't want to go below ambient is that it is a everyday computer for me. Of course, you guys probably use yours everyday, but my family uses it everyday and don't want them to have to monitor it (yes, my family is cool about me OCing it). Right now it is just a stage in my head, just lots of ideas floating around. Maybe in a couple of weeks I can buy one just to mess around with outside my case, I have a bench supply and several HSF's, to see around what kind of temps.

Another question, the one you mentioned and several I looked at were 50x50mm. The processor itself isn't that large, so is that were the cold plate comes in?

This is probably something I would really like doing sometime

Thanks again!
ry.david
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post #4 of 8
Quote:
Originally Posted by ry.david
Thanks so much for the quick reply.

The main reason that I don't want to go below ambient is that it is a everyday computer for me. Of course, you guys probably use yours everyday, but my family uses it everyday and don't want them to have to monitor it (yes, my family is cool about me OCing it). Right now it is just a stage in my head, just lots of ideas floating around. Maybe in a couple of weeks I can buy one just to mess around with outside my case, I have a bench supply and several HSF's, to see around what kind of temps.

Another question, the one you mentioned and several I looked at were 50x50mm. The processor itself isn't that large, so is that were the cold plate comes in?

This is probably something I would really like doing sometime

Thanks again!
ry.david
Yeah, you are probably not going to see much success in cooling a pelt with air. Even just trying to keep at an ambient temp. I have attempted cooling my video card with a small pelt, and a HSF, at idle it would stay right at ambient which was cool! It would idle at 34°c without the pelt 21° with it. But it's not enough to keep it there once the heat is turned on by a game or benchmark, soon as the vid card starts working hard you know. The temp would go up to 75°c. Needless to say, it couldn't afford me any more of an overclock either.
You can however do it with water and probably keep it around ambient temp. Since you have a 12v bench PSU, you'd have the best experience with a 24v pelt, so it will run at half voltage on your 12v PSU.
The cold plate is mainly for distributing the temp of the pelt, helps to spread it evenly across the CPU.
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post #5 of 8
Thread Starter 
Thanks for the reply.

I found a similar peltier at CrazyPC. Their price for the 226W is a little cheaper, plus they are a local store. I like to support local people, plus I don't have to pay for shipping since I can pick it up myself! I going to have to wait a week or so before I start messing around with these, I have no money!

As far as controlling the temperatures (assuming air cooling could keep up): Can you control a peltier by limiting the amps supplied to it? (ie, Parallax has a motor control for the BASIC stamps. It can spit out up to 25A, which would be good for up to 300W)

Thanks again!
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post #6 of 8
Trying to cool the TEC with air is going to most likely not cope with the added heat. Having it under volted a fair bit then it might just be able to work. Water cooling would really be the best way.

Have you got a link for the motor control as a couple of us here are looking for a way to control the 437 WATT TEC.
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post #7 of 8
Thread Starter 
Sure,
http://www.parallax.com/detail.asp?product_id=29144

I was thinking about getting a BASIC 2 stamp and the programmer board. Then maybe a few temp sensors and the above motor controll. Kinda pricey though.

I am not sure that you can run a 400+ pelt with this.

EDIT: It puts out 25A @ 16V = exactly 400W. Well if you under volt it, I guess...
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post #8 of 8
Quote:
Originally Posted by ry.david
Sure,
http://www.parallax.com/detail.asp?product_id=29144

I was thinking about getting a BASIC 2 stamp and the programmer board. Then maybe a few temp sensors and the above motor controll. Kinda pricey though.

I am not sure that you can run a 400+ pelt with this.

EDIT: It puts out 25A @ 16V = exactly 400W. Well if you under volt it, I guess...
The common 437w peltier pulls 25a at 24v. So at 16v that thing would be more than sufficient. I may have to look into this thing.
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