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Ultrasonic2's TEC Calculator - Page 3  

post #21 of 93
Yall are confusing me just a bit. I tryed to follow this just to understand exactly what you guys were talking about, but no way lol
Meh.
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Meh.
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post #22 of 93
Quote:
Originally Posted by Ultrasonic2 (muffy) View Post
i can see how that's right ..

#3 718.2= 270x(1.33*(3-1))
thats a long way from 477.6
it would be
= 270 x 1.33^2 (1.33 squared)

= 270 x 1.7689

= 477.603

You have multiplied 1.33 by 2 where you need to raise it to the power of 2. Sorry if i wasnt clear about the powers thing. I think ^ is the notation used in vb.
post #23 of 93
Thread Starter 
Quote:
Originally Posted by itslogz View Post
Yall are confusing me just a bit. I tryed to follow this just to understand exactly what you guys were talking about, but no way lol
i dont think we know what were talking about also

Scarlet Infidel .. right i'll try that when i get home from work.
Hay did you join this forum just to talk to me about this app ? i do Appreciate the company
post #24 of 93
Thats exactly why. Peltiers are a pain to deal with because of the maths and i've never come across a useful, easy to use program that will do what I want. I have a project in mind that I hope will help to shoot down the common beliefs that peltiers are inefficient, underpowered, expensive and cause dangerous condensation.

I was about to give up and make my own program (I really should, I study Computer Science at University) when I ran across yours which looks and handles almost exactly how I want. So I thought I'd be better off helping with yours and encouraging you then starting from scratch.
post #25 of 93
Thread Starter 
well thanks for the help .. and i mean that..

i think i'll be able to get my app pretty close to the kryot.. one .. i do think my biggest problem is that i actually dont think the kryot.. program is very accurate so comparing my numbers against it is a little point less ... i found some strange quirks with the kryot.. app . which I think are unexplainable.

I love the challenge of TEC cooling .. sure you can phase change and get better temps . But that’s a no brainier. Watercooling by it’s self has been done a million times and is a bit more boring .. I love the challenge of TEC .. im up to my 5th multi TEC project now ..basically they haven’t work so far .im sure my 5th one will work . all I need is a milling machine. I think im gonna make a milling machine as it’ll be cheaper.

here is a link to my last project
http://forums.extremeoverclocking.co...d.php?t=261941
post #26 of 93
Just looked at that thread and it confirms that we both have a very similar project plan. My idea involves using 10 (so far) 136.8w peltiers with the specs I gave you and i was thinking of air cooling the hot side with the cheapest cpu coolers I could find (potential weak link).

So far the peltiers have set me back £17 and the heatsinks are looking to be about £20 (ones im currently looking at). I was going to use some large low speed fans and a make a shroud.

Your idea of having the water directly on the peltier faces is interesting. I agree that the peltiers will have quite a large surface area and I was thinking on a simple maze with very high flow and low restriction.

However I was thinking of using a copper plate in between. This will make mouting everything easier and ive read that peltiers need a high pressure to perform well (not sure if this applies when theres no thermal interface like in your idea).
post #27 of 93
Just found this on the melcor web page:

The recommended compression for a TEC assembly is 150 to 300 pounds per square inch of module surface area.

Now, as I said; I dont know if thats to do with something internal needing the pressure or just to get a good conductive interface. Something to test maybe.
post #28 of 93
Thread Starter 
I don’t think air cooling is the way to go especially with those heat sinks .. they will have a relatively high C/w i would think 0.2 plus. Which means your going to need a number of them . Unless you use one tec for each cooler your then going to have to use a heat spreader which will reduce efficiency and increase C/W’s ... I wont even start with how much noise all those heat sinks will make. It is my belief that a low hot side C/W is crucial to making a successful TEC cooling system . For this reason i intend to use 12 70 watt tec’s to cool a load af about 200watts to ambient . sure i could use fewer 437 watt tec’s. However if i did this it would result in higher hot side temps because im trying to move the same heat as with more lower powered TEC’s but over a smaller area which will result in higher temps . I will of course be water cooling both sides of the TEC
post #29 of 93
Thread Starter 
from my testing having super high pressure isn't as crucial as people make out especially when using a quality paste
post #30 of 93
Quote:
Originally Posted by Scarlet Infidel View Post
Just found this on the melcor web page:

The recommended compression for a TEC assembly is 150 to 300 pounds per square inch of module surface area.

Now, as I said; I dont know if thats to do with something internal needing the pressure or just to get a good conductive interface. Something to test maybe.
Check up with ira-k on that... I believe he has done testing on that topic.
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