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Ultrasonic2's TEC Calculator - Page 4  

post #31 of 93
Thanks DuckieHo, I'll have to see if I can find that info.

Well as in the link I showed you id be planning to use 10 heatsinks, one for each peltier. So each heatsink would be dealing with around 30w or less.

I realise watercooling the hot side is probably the only practical solution, but I'm determined to try with air for the sake of cost size and noise (form the extra pump). I would be scrapping all those 70mm fans in favour of 2 140mm fans and a shroud i'd make (or some other configuration of large fans depending on testing - no more than 4 120mm fans though else its unpractical).

At the end of the day, if CoolIT can make it work (albeit not amazingly and at a cost) in such a compact form then why cant I? Feel free to quote this when I try, fail then move to using watercooling.
post #32 of 93
Actually, looking at the CoolIT Boreas, thats not a million miles away from what I had in mind. That uses 12 TECs like you intend to and im going for 10. In all their designs they seem to run each peltier at around 9-12w which is what my figures seemed to indicate would be a good compromise.

Im glad they list so much detail on their site, it even tells me the heatsink surface area is 956,097mm² which is similar to ten of those hestinks (by a very rough estimate). The heatsink material is obviously the same. They qoute their fans at 120cfm, I imagine my airflow will be less than that, maybe in the 80-100 ball park but then I think their heatsink design looks more restrictive anyway. Im not overly confident that my solution will work, but I still want to persue it a bit longer, if only in theory.

Compare this to the more modest freezone model:
Surface Area = 366,912mm²
6 peltiers
92mm fan at 65cfm

That should be easy to beat, expecially as ill be using a much better pump and cpu block then them anyway.
post #33 of 93
Quote:
Originally Posted by Scarlet Infidel View Post
Feel free to quote this when I try, fail then move to using watercooling.
sure, if you want that
but i'll love you more when you succeed.
post #34 of 93
Thread Starter 
Quote:
Originally Posted by Scarlet Infidel View Post
At the end of the day, if CoolIT can make it work (albeit not amazingly and at a cost) in such a compact form then why cant I? Feel free to quote this when I try, fail then move to using watercooling.
Yip thats true.

your just making it larger which should result in more efficiency
on the topic of size it is doing to be huge . 10x 7cm 70cm minimum .. i guess you could do two rows to make it shorter which i think if your plan .. im just thinking out a loud.

I'd love to see you build it. When do you think you'll start?

As for my app im getting there.
i now have qmax based on abient temp and qmax based on C/W of the hot side working correctly... i just have to work out the dTmax and electricty used and th and tc temps.

i think the hardest one to do is the electricity used based on abient temp and hot side C/W ..im working on it ....
post #35 of 93
Well done, ive tried to work some of it out but so far havent come up with anything very useful.

Yes, I intend to do it in two rows so itll be 30-40 cm long and 15-20 cm wide which i think is the upper limits of sensibility. I have a very clear picture in my mind of how itll look, ill draw a picture sometime to clarify.

Whilst im at university I have no tools and very few materials. I intend to plan the whole thing out in huge detail then get to work on it over the christmas holiday (so a bit of a wait im afraid). Also when im at home my dad can help me and hes very good at working with materials and building complex things precisely.
post #36 of 93
Muffy, little OT probably, but how do i calculate Qx and Ix from Qmax, Umax, Imax and a given Ix?
post #37 of 93
Thread Starter 
What is "OT". What is Amax ? ambient ?

im still not happy with how i work out qmax ralitive to C/W
post #38 of 93
whoops. getting things mixed up.
OT is offtopic.

Fix'd
post #39 of 93
Thread Starter 
watts max is a constant ralitive to the rated Qmax

For a 172 TEC. electricity Watts max is about 210% of 172 or 361.64 watts.

361.64 watts max is always used at qmax, even after taking into acount a change in qmax ralitive to th temp.

So if qmax is now 1000 because of a th temp of X then if your cooling a load of 1000 you'll be using 361.64 watts to move the load of 1000 to abient.


my app is almost done.. it should be a hugh improvement ... not perfect yet though
post #40 of 93
Im a bit busy this week visiting my girlfriend but im looking forward to seeing what progress you have made.
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