Toying with TECs

[Frozennova]

After finding out about TECs I became very curious about them working, and once I'd saw pnemonics build this only increased the curiosity leaving an itch that must be scratched. but firstly this leaves a few questions regarding heatdump and cooling power.

Firstly I'm looking at doing chilled loop as this will be most effective. I've looked at undervolting charts of xtremesystems and decided on 3 possibilities either the 226W danger den, or 320w and 437w elsewhere do the figures below look accurate as far as heat moved and heat dump im looking at.

226W Peltier

Vmax 12v Heatdump Single 368.18W
Qmax 140.9W Heatdump 1472.72W
Imax 18.94A

Number of Tecs 4
Total Cooling Power 563.6W

 

[Frozennova]

Do a google search for tec undervolting its the result that points to xtemesystems

it'll be powered by a standard psu with the 12 rails internally joined.
I plan on using around 4 of these to give a high cooling capacity.

The pelts will be cooked using a second water loop, and yes i'll be using anti freeze

 

[Frozennova]

I've looked back over things and decided 3 of the 226w pelts undervolted should provide enough heat transfer (440w).

As far as heat exhangers go I haven't a clue so sharing you knowledge would be appreciated. Im assuming yours will be CNC machined as from previous posts your in the engineering field. I havne't got the budget for such luxury so I'll either be buying them off the shelf or hand mill my own heat exchangers proving I can get hold of a family friend who owns an engineering company fairly local.

The tecs will be drawing ~ 19*3=57amps and I'm looking at using the 1000w corsair as it provideds 40amps per rail, I'm contemplating building a rad/psu box to seperatly house these as I want to build this is a mid tower rather than full tower case so internally mounting two loops, a heat exchanger, 2 psus and 2 240 rads is going to be a squeeze.

My initial project will be based around a 775 rig that im currently stockpiling components for as they pop up on MM or auction sites, then once the budget allows I'll move onto i5 or i7 probably tweaking initial errors or making improvements.

Budget has no been considered as I have only just begun researching and budgets are rarely followed.

I will be doing a good 6 months of research and design work before the actual build commenses so I can be sure of enough research and planning

 

[Frozennova]

Datasheet(226w 15.2v): http://www.customthermoelectric.com/tecs/pdf/12711-5M31-24CZ_spec_sht.pdf

The initial build will be using an Intel E1200 (65W TDP) that I picked up for £10 off the bay, I plan on buying most of the components used however PSU and Case will be new.

Could you expand on the parasitic load part, is this essentially as the pelt will be below ambient heat will be transferred from the atmosphere to the cold side?

I'm by no means considerably skilled within engineering I can use a lathe and a mill to an acceptable accuracy which I believe will be invaluable in a project like this.

I know assumptions are generally wrong but are the heat exhangers two larger copper waterblocks with the pelts clammed between them at a high pressure ~200psi?

EDIT:

I've just looked over the datasheet and would I be interpretting the graphs correctly by thinking the Qmax at a DeltaT of 30° would be ~105w giving a Qmax of 420w across 4 tecs

I've just looked at the 225w tecs that you linked and running 6 of these would require 6amps less to power than the 226w units and would yield a matching Qmax at a DeltaT 30°

 

[Frozennova]

The E1200 is just a test processor, depending on how long the build takes and cost I will then either move on to i5/i7 most probably tweaking along the way.

As far as PSUs I hoping for something that was variable voltage, and small enough to fit into a drive bay but I doubt anything capable enough can be found. Size will be an important issue as I want everything to go into a CM-690 II as I love the look of these cases and they provide excellent W/C options without breaking the bank, however means using thinnner rads which is why two will be used as I dont want any toasted pelts

Thanks for expanding on heat exchangers and effieciency, this should give me a firm basis to work upon