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Peltier chilling system - Page 11

post #101 of 167
Quote:
Originally Posted by mrkubanftw View Post

[IMG]


I had considered the alphacool pump version I've seen that is built into a block. It has two G1/4 inlets and two outlets. This XPSC radiator also has two G1/4 inlets and I could easily fit two G1/4 ports on each side of my waterblock. That would make for some ridiculous flow rates.

http://www.overclock.net/t/1573189/serial-vs-parallel-9-6lpm

if done right, it can only help to cool the system better.
my last system had a 9.6LPM flow rate, and the TEC system I am building now, the hot side water loop on that has a 9.5LPM flow rate.
post #102 of 167
Thread Starter 
Yeah I'm definitely contemplating just popping two holes on each side of the water blocks to give it a try. I have enough acrylic to try it both ways I'm pretty sure! Got a shot with 8 fans on. Might hook this up to my current test loop just to play.
post #103 of 167
Are your clamping bolts/nuts isolated from the copper? That's all I'm saying. The bolts that clamp the two blocks on the TEC must be isolated from the hot side copper. How many clamping bolts are you using? If you try to use all 12 holes as through clamping bolts that's tricky to get the o-rings to seal and also makes it likely that the blocks won't have nice flat contact to the TEC. 2 to 4 bolts clamping the two blocks and the TEC together is good. The other 6 to 8 for clamping the copper to each individual acrylic top is also ideal, they can be threaded into the acrylic or the copper as they don't require much torque to seal the o-ring.

Foxrena makes his blocks on a converted hobby mill, I think it's a grizzly with a CNC conversion. he does it in his spare time and it is by no means his occupation, but he does great work. Manual tool changes, slow feed rates, probably manual cutting fluid application. I think it takes him a weekend to do a copper plate with channels. Having access to this at work is ideal though and can be much much more economical.

That setup with individual rads/pumps for each block is beast and is similar to how I planned on doing it long ago. 6 x 480 radiators with 4 x dual tec blocks. Also like the idea of dual inlet outlet to get that flow rate up. Higher flow rate will always equal more performance with these kind of blocks simply because a minor change in thermal resistance with such a high wattage heat load makes a big difference in temp delta between the TEC and the coolant.

Nice work, can't wait to see this in action!
post #104 of 167
Thread Starter 
Apologies, I see what you mean now. The bolts sandwiching the tec inbetween the blocks. I hadn't really considered that until this point. I had planned to make some type of bracket off the acrylic but yeah i suppose i could just use a few holes off my existing bolt pattern. Thanks!
post #105 of 167
Brackets are also fine, easier to just dedicate a few of the holes to clamping bolts though. O-rings will seal fine with 6-8 screws if you do use 2 or 4 of the holes for clamping bolts though. The only reason I would say don;t use brackets is because TEC manufacturers recommend the screws that clamp the blocks to the TEC should be as close to the sides of the TEC as possible to limit bowing of the copper plates. Your plates are pretty thick though so bowing isn't a huge issue.
post #106 of 167
Thread Starter 
Quote:
Originally Posted by LiamG6 View Post

Brackets are also fine, easier to just dedicate a few of the holes to clamping bolts though. O-rings will seal fine with 6-8 screws if you do use 2 or 4 of the holes for clamping bolts though. The only reason I would say don;t use brackets is because TEC manufacturers recommend the screws that clamp the blocks to the TEC should be as close to the sides of the TEC as possible to limit bowing of the copper plates. Your plates are pretty thick though so bowing isn't a huge issue.

Yup i totally see what you mean! Copper is around .23 thick currently. I may need to deck more yet off the other side i started with as that cut bowed slightly in the hard jaws. Well i guess then, ill order the alphacool pump setup with two inlet and two outlets so i can utilize increased flow. It should help to even the flow out across the slots as well.
post #107 of 167
Thread Starter 
Posting some solid-models for Liam to do flo testing on. This is the single port design, i'm modifying for the dual port right now, will post shortly. water-blocks.zip 1310k .zip file
post #108 of 167
Thread Starter 
2port.zip 1310k .zip file

Here's the other!
post #109 of 167
Here's flow sim for single port. Flo xpress can only handle 1 inlet and 1 outlet so can;t do your second design with 2 ports. Your block is good, might need a jet plate to make sure that the outer channels are getting enough coolant, they are a bit behind the middle channels, although velocity is similar so it should be ok, but as I said in the otehr thread, this is an indication only without going further with the settings, so the actual velocity may not be equal in your actual block. Obviously your 2 port design helps alleviate that problem, provided the pump top is flowing equally out of both outlets. I like the 2 port design because it encourages the highest possible flow rate and still gets good coverage over the block, which single port and jet plate does but flow is slightly restricted. Ideally the length of your channels would be 62mm as well, but as you have that plenum chamber under the inlet and outlet the block is still staying cool, but those edges of the TEC will be hotter than the rest, I think it would be ok if your channels were 62mm and extended out into the plenum chamber a bit. bigger channel area means lower thermal resistance and more even TEC temp which is the goal. Understand you are restricted by material size but I think that change is necessary.




Edited by LiamG6 - 8/15/16 at 6:14pm
post #110 of 167
Thread Starter 
Quote:
Originally Posted by LiamG6 View Post

Here's flow sim for single port. Flo xpress can only handle 1 inlet and 1 outlet so can;t do your second design with 2 ports. Your block is good, might need a jet plate to make sure that the outer channels are getting enough coolant, they are a bit behind the middle channels, although velocity is similar so it should be ok, but as I said in the otehr thread, this is an indication only without going further with the settings, so the actual velocity may not be equal in your actual block. Obviously your 2 port design helps alleviate that problem, provided the pump top is flowing equally out of both outlets. I like the 2 port design because it encourages the highest possible flow rate and still gets good coverage over the block, which single port and jet plate does but flow is slightly restricted. Ideally the length of your channels would be 62mm as well, but as you have that plenum chamber under the inlet and outlet the block is still staying cool, but those edges of the TEC will be hotter than the rest, I think it would be ok if your channels were 62mm and extended out into the plenum chamber a bit. bigger channel area means lower thermal resistance and more even TEC temp which is the goal. Understand you are restricted by material size but I think that change is necessary.




Thanks for running! I could make a dummy port on the top that connects the two ports to a port that has the same area as the two ports. But i think i'm pretty happy with this. Ill see what i can figure out on extending the slots over the plenum area. Given though i have already starting milling these blocks haha... its kinda too late to change up designs. However. I have not milled the plenum area nor the slot area. What if i created a pin array in the plenum area? Nothing crazy. But something to further dissipate heat in the plenum area. Since the two port design encourages flow on the ends of the block... i don't think flow rate would be too adversely affected. Plus i would make it a relatively course pin array so it wouldn't be too restrictive, yet it would still add surface area.
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