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Triple peltier chiller - Page 8

post #71 of 748
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Yea LET will be fine for front and back of the board also I'm not saying you should but lapping ihs the bit that is glued sanding that abit help the thinner layer of paste and heat transfer faster plus look at the heat I moved with my 240 rad wink.gif 3 250 at 12v plus cpu
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post #72 of 748
yeah I'll do some testing with the IHS with Artic Ceramique 2, I'll lap the edge of IHS that contacts the substrate if I can't get good contact on the die with the AC2 test before I try it with thermal grizzly. I don't want to take too much off though as I don't want to crack the die when I crank the TEC down on it with the water block, I bought some long M3 bolts with nuts to mount the block to it with more pressure than the standard mounting mechanism. I guess I could actually use LET on the CPU substrate to insulate the FIVR capacitors and to also stick the IHS back on.

My rads are some old school EKWB coolstream 35mm thick rads so they are a bit ordinary performance wise, I couldn't mount anything thicker in my case without hitting the motherboard. I don't have anywhere to mount another radiator but I can make some brackets to hold another one inside the case if need be. I'll get some EK Vardar 2200rpm fans to go with it but it'll still only fit another 35mm rad, no room for 60mm rads unfortunately. May not need it at all, hopefully not. Will find out soon.

EDIT, just read an old review of my EKWB Coolstream XT radiator and it says that with 1400rpm fans it will hold a 200w heatload to 5*c delta, so with my 1200rpm fans, actually they run at about 1300rpm measured I think I'll get about 6*c delta with 200w heatload. If in reality my heatload is higher or my delta is higher I may get another rad.
Edited by LiamG6 - 10/8/15 at 7:36am
post #73 of 748
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Be intresting to see how much difference it makes and ah that sucks the 60mm thick is bit big for most things though why it has a rad box biggrin.gif
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post #74 of 748
the review I just read made me feel better about them, they are dual pass radiators, 47mm thick (been years since I installed them so forgot that haha) but only a 30mm thick core. If I can hold 6*c water to ambient air delta with 200w heat load I'd be happy to stick with the 360mm of rad.
post #75 of 748
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That's good for a 47mm, my 32mm says 210w but my 240 60mm says 380watts but I dunno I'm not pro at that kinda stuff I just say more rads more pumps better cooling biggrin.gif
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post #76 of 748
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Yet waiting on my other 360 rad wich will be going in the place of the two 120's or at least one wink.gif and keeping good flow rates just hope the other 360 dosnt kill it much more
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post #77 of 748
What are the temps of your hot side of the peltiers. I have heard they must be around 125c for the peltier to work efficiently. Hot side must be hot to cool. Looking good.
post #78 of 748
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It isn't built yet but I'm aiming to cool 600watt of heat to 25-30*c hot side temp with a 30delta with my test run full load on 200watt cpu was 22*c max with a small res under 1l also try running a peltier at 125*c and tell me hot fast it blows up or catches fire lol you need to keep the hot side cool as possible but if you buy a 250watt 12715 peltier you need to cool 300 watts+ of heat plus what ever heat load you add to it the way you want to use one is a bad idea as you'll be chilling the cold side making the hot side heat up a lot
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post #79 of 748
@5GHZ desire, TEC's have a maximum delta between the hot and cold sides of about 60-85 degrees celsius, so if you ran a TEC with the hotside at 125*c, your cold side would be at approximately 40-65degrees celsius, and that is with 0watt heat load, so that is effectively cooking your CPU or heating up your water in a chiller.

Now it is true that TEC's are more efficient with the hotside at higher temps, but it is pointless if your cold side isn't colder than ambient temperature, which is what we want for this application. For instance at 50*c hotside temp, you may get a greater delta between hot and cold side and your Qmax will also increase compared to if your hotside was at 27*c, for instance your dt may increase from 74*c to 83*c and your Qmax may increase from 122w to 134w Qmax such as this TEC http://www.thermonamic.com/TEHC1-12712S-English.pdf However that increase in efficiency isn't enough to overcome the fact that your hotside is 23*c hotter, which means your cold side is 23*c hotter and your Dt only increased by 9*c so it can't overcome the deficit even though it is operating in a more efficient zone.

So even though TEC's are more efficient with a higher hot side temp, they are less effective for our application as the idea is to get the cold side to a sub ambient or even sub zero temperature. So the order of the day for us is to get that hotside as cold as possible, with the methods of cooling being liquid or air, that means we try to keep the hotside as close as possible to ambient temperature, which is as cold as we can get it with the hot side cooling methods we are using, that allows your delta between hot and cold side of the TEC to get the cold side as cool as we can possibly get it which is what we want to get our CPU's nice and chilly biggrin.gif
Edited by LiamG6 - 10/9/15 at 1:58am
post #80 of 748
I think I felt my head grow a little lol. Very insightful. So water cooling on the hot side is a must to go very cold.
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