Post Rad Chiller Concept

[Uncle Jimbo]

Some good info, seems to match with what Ive got in the way of equations but its nicer to have it in words.

That peltier you mentioned (03140) seems a little obscure. Do you know where to get them from?

When I chose the peltiers I did (TEC12709) I was aiming for:

Highest current,
Smallest physical size (40mm - this was to minimise copper cold plate costs),
Being dirt cheap ($35 for 10 inc. world-wide postage, packaging and paypal fees).

I don't think those TECs are cheap - oddball voltage is usually pretty high price. One example is 03111-5M31-40CQ at http://customthermoelectric.com/tecs...FRaQggodl1GdFA - That is a 03140 part for about $50, but for what you are doing, they are probably not a good choice. I was only looking at them to test the edge case for better efficiency.

The 12709s are 40mm, right? If your setup can take a 62mm, your low cost choice is a 12730 which is the highest current 127 element I have seen commonly available. I have also used the '437W' TEC from Frozencpu http://www.frozencpu.com/products/24...x_Peltier.html which is a 19933, also in a 62mm size. At $50 it is pretty expensive and undervolt performance is only a little better than the 12730.

The biggest amp unit I have seen is a 03178, one example is at http://www.inbthermoelectric.com/highperformance.html listed as inb 31-5.0-1.5 - that is a 55mm unit which can pass 78A. It is a little less efficient at full power than the 12730. I have not used it, but the data suggest 4 of those in series would move 750W at full power (1200W in!). But at 5V across 4 in series, it should move 140W or so with maybe 65W in. That might be interesting to check out the question is what it would draw at 5V, given that is only 1.25V per module.