peltier cooling wil this work ????

[michael westen]

Hi next year I want build a AMD XP machine and wane over clock it BIG time

This is what I had in mind :-)
Using a water cooling system whit peltier CPU cooler and a extra peltier water cooler
I have some point’s ware I am not shore of
I just wondering what you guy’s think of it

1 To let the coolant run strait over the peltier is this a option because I haven’t seen anybody doing it

2 Using a second peltier to pre cool the coolant so you primary one works better is this a good option???

3 Thinking of using glycol (ore maybe alcohol ore so) as a coolant ore maybe some one has a better option because of the second perlier need something else then water

4 For the second perlier thinking of using a bigger one 60 x 60 ore bigger ore even to, any suggestion???

5 Ass a radiator thinking of using a car dashboard heater they are compact cheap and have a great heat transport

6 Maybe a option is no perlier on the CPU and just use the freezing glycol???


Any sugtions will be very welcome :-)

greetings Michael westen

[plague]

wait a minute...just wait... You have those 2 pelts cooling the water before and after the waterblock, right? the way you have it drawn, the hot sides of the pelts are against each other - this will not work, dont even try it. You would have to separate them and put a hsf or something on the pelt's hot side to get rid of the heat. Oh, and if you did cool off the pelts, wouldnt you just be using them as a radiator? You wouldnt really need a rad if this worked. I just think it wouldnt be worth it because you have to also cool the pelts.

[plague]

wait a minute, me now. I think I see what youre doing now, its only one pelt, and the second waterblock is cooling it. Well, heres another thought...I understand that you would remove heat from the water before it went to the block and use another block after the cpu to cool the hot side of the pelt, it just doesnt seem efficent. You should use a source seperate from this water circuit to cool the second pelt, this way you arent putting the heat right back in to the water that you took out on the cold side.

[michael westen]

yeah was thinking that the coolant of the primary perlier was still cool enough to cool the second one there are to options if it isn’t

1 use a extra radiator between the first and the second perlier but it use to mouths space : (

2 use a T piece between pomp and secondary perlier and cool that one also strait from the radiator and connect both perlier outlet to radiator inlet

dont no whats best leave it like it is ore change it

Michael Westen

[Diggrr]

Hello Michael, and Welcome to the forums.

I'm sorry to say, this system would not work.
A peltier not only moves heat from one side to the other, but it adds it's own heat as well. Using watts, say you had a 120watt peltier in that center block. It would move about 96 watts of heat (at 80% efficiency) from one side into the other, and add 120 watts of it's own heat.
Cooling would equal 96watts, but it would heat the water by 216 watts each cycle of the water. It would eventually overpower itself, and the water would boil (if the processor didn't go first).

It would work much better to have the two peltiers side by side on the same cooling plate.

If you would still like to run it as a water chiller, you could, but it would need it's own cooling loop (pump and radiator). In practice however, not many people have had success with chillers.

Best of luck to ya, and very nice drawings.

*edit* For those watching my math above, it's just an illuststration of the point, and not actual results.

[michael westen]

Yeah but you cool the excess heat in ore radiator don’t you en get writ of it there???
As long as the radiator and pump (1300L/h ore do I need a bigger one) is big enough you can get writhe of the heat it doesn’t mater if you have a T piece and spit the stream to cool both perlier’s whit one radiator dose it

Michael

[Diggrr]

Splitting the tubing may help at the blocks, but the total system heat would remain the same.
A larger pump would not help. Too much flow hinders the radiator's performance.
If the radiator is large enough to handle all the heat, you might be okay, but if it can, the cpu's peltier would be enough by itself. Using a larger peltier would give better results with less cost and complication.

[michael westen]

I want to use a 172 watt perlier but from what I have bin reading of dubbeling the perlier’s it also gif a lot of problems and I can do that always if I want to

And for a radiator I want to use a car radiator from the dashboard the one you use to heat up ore car they are 300 X 150 X 50 mm (12 X 6 X 2 “) ore somting like it think they are big enough

But what I am wondering is if you run ore coolant over ore perlier will that work well anyone try that think that will work better then have a piece of copper in between it???

Michael

[wolfsid]

Chillers don't do much because of the transfer of heat and cold in the fluid is not there.. U can heat up water quick but to cool it down U almost need twice as much cooling as U would need heat..

[Diggrr]

http://www.overclockers.com/tips111/

I've seen direct cooling of a peltier at the above link, but some here say it wouldn't work.:eh?:

Look in the messages here, I do believe that more than one person is using 2 peltiers on one cold plate (side by side, not stacked upon each other) This way you can use two smaller peltiers if a large one is not available. They should be within the last five day's messages.

I do wish you luck, and am sorry the news was less than good on your design. Keep trying, we couldn't know everything! (we just think we do):)

[michael westen]

tnx diggrr

I can see why some say that, I don’t have mouths fate in this solution idler think the space is to big above the perlier so most of the flow will be wasted anyway, what I am thinking of is a gab between perlier and the housing over the hole width of the perlier whit the size of the tube so al the coolant will flow over it and not flow high above it

but i am still wondering if its a good idear :)
michael

[ButcherUK]

For your coolant you should try to stay with water unless that's not possible due to low temps, then a mix of methanol/water is the best (glycol is much thicker). Running straight methanol is bad due to high flammability, the chances of burning your house down are high. As for gycol it's much thicker than water and methanol and has less heat capacity (as does mthanol in fact) so it's not a good option. If you need to sourse methanol/water then apparently car washer fluid is exactly that.

[Diggrr]

Great tip ButcherUK!
I'm going colder this week, and was thinking where I could get methanol. I'm bypassing my radiator and puting a copper tube outside. That washer fluid is only $.99 per gallon here (3.8 liters) which is the same price as distilled water.

[michael westen]

hhhmm good tip just a small Q can je also pute water wetter whit it some time if you pute to gind of fluid's to geter they will clots ?

greetings michael

[JFettig]

ok the only reason that this doesnt work is because of the surface area, water has to go over a lot of surface area to be cooled, and i have found a way to make a waterchiller work with a pelt!! and you need to aircool the pelt with like a 80watt pelt, and what i have done is put a heatercore in the window(-10c) and then ran water thru it and it was VERY COLD! good news!!!