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have a werid water cooling idea....would like some advice

post #1 of 11
Thread Starter 
hello all.


im currently cooling my cpu with a h100. and i have a h50 going spare....i also have a fair few peltier modules and heatsinks going spare also.

sorry for the crudeless of paint but i hope this picture gets the idea acroos




for almost no money i can make this arrangement happen in a few hours....
but i have some questions before i start.

1. will running two identical pumps at the same rate in series be a problem?

2. i need to put a small reservoir in it somewhere to help fill/bleed the system. where would the best place be? the easiest would be inbetween the two rads as thats where i can cut the hoses. Will that be ok?

3. any other help or advice is appreciated

thanks in advance
jim.
post #2 of 11
Quote:
Originally Posted by jimmyhackers View Post


1. will running two identical pumps at the same rate in series be a problem?

No problem

2. i need to put a small reservoir in it somewhere to help fill/bleed the system. where would the best place be? the easiest would be inbetween the two rads as thats where i can cut the hoses. Will that be ok?

Anywhere is OK, But bleeding will be easier the less components there are above it.
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post #3 of 11
Bleeding and filling will be easier having the res before the first pump I think. However, I would place the reservoir where you could have the easiest access to it, but it should be before one of the pumps.
Edited by EMUracing - 4/24/17 at 11:09am
post #4 of 11
Thread Starter 
thanks for the help guys.

been a lot longer than i expected......china's cheap but dam, you' have to wait for parts....just waiting for tubing now.

in that time i have come up with some more new questions.....

1. am i better off with a seperate 240mm radiator and a 120mm in series..... like in my crude picture.....or going with a single 360mm rad instead?

I cant help but feel two seperate rads would be better. due to the looping flow of the rads.....the fins closest to the intake/outtake side are shared between the two hottest and coldest points on the radiator making for possible heat contamination.
meaning in one single rad this difference is more extreme than compared to the two smaller rads.

2. how much will i have to worry about internal icing of the coolant? most premixed seem to be rated to minus 8 degrees c. i don't think ill get that cold but are all premixed coolants good for their stated ratings?
post #5 of 11
condensation on the lines and anything metal would be the main worry.
post #6 of 11
Thread Starter 
thanks for the concern

i used to be an aircon and refrigeration technician tongue.gif so i know all about condensate buildup. Some good pipe lagging on certain lines should prevent this. i figure the cpu will be running to hot to be cool enough to form condensate on it or its block, so i should be safe internally.

and some well placed insulative material around the peltier/block arrangement should prevent it from forming there also.....which is my main concern area for condensate buildup.

this part however will be located ontop of my case along with the reservoir so its condensate if any should be easy enough to divert to a non dangerous area.

ive been doing some thinkings.... peltiers say they do a 68 degree c temperature difference.....but i find its much closer to 15 or 20degrees.

even if i get the "hot side" of the peltier down to ambient tempretures...which i wont be able to....15 degrees lower than 22degc (my room tempreture) means a cold side of 5degreees c....thatll have warmer water being fed to it..... so.....

i honeslty wont know untill i build it how much well it works....but i have a sneaky feeling it wont be cold enough to form a condensate at all.

i can experiment with differnt wattage peltiers and find a nice equilibrium....
post #7 of 11
A single peltier wont do much other than increase ur energy bill and pump heat into ur room.
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post #8 of 11
I've found peltiers are really fun to mess around with and see what you can do, but the practical benefit is pretty iffy considering all the possible cons and the level of control necessary to make it work. Most pelts are rated in some sort of fantasy universe judging by the claims on the listing when you order one. It's also wroth noting that they generate tons of waste heat and become very hard to cool when running at rated voltage. A single small pelt probably won't do you much good. A large unit running at about half voltage is reasonably efficient, or a few small ones at low voltage. Otherwise it's very hard to control the waste heat. By all means give it a shot and see what happens but be prepared to ditch the idea or start really digging in to it as a big project thumb.gif

Also consider that having radiators and fans on the cold side isn't going to help if the idea is to run the coolant below room temperature. The rads act as heat exchangers and work to bring the coolant temp closer to the air temp, even if that means adding heat rather than removing it because the coolant is sub-ambient. If the goal is just to use the peltier to help pump out some more heat than the radiators can alone that's one thing but at that point more surface area or stronger fans would achieve the same result for a lot less power loss.
 
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post #9 of 11
Thread Starter 
yeah i feel im just at the tip of the iceberg.

without actually knowing coolant tempertatures at each stage of the loop.....i cant really say whats doing what.

im trying to get my head around this "coolant temperature stabilisation" and basically so far i figure it does what it says ....

but just to clarify.......the coolant temperature remains pretty constant throughout the whole loop....is this really the case?
seems mad to me but oh well...it is what it is.

i also figure unless the water entering my peltier device is at ambient or close enough....im better off adding a larger radiator untill it is.

im a trained aircon and refrigeration technician......so i know a fair few ways to do this.....envolving noisey compressors and a whole load of hassle that i dont want.

im looking for a mid ground solution between water cooling and a phase change system.

my idea "if it works" adds somne redundancy that if the peltier fails ill still have a working water loop

so far ive seen about a 2 degrees c drop of room temperature water making a single pass through my current single peltier (tested now at 36watt) on a h100pump/block from one cup to another...

thanks for the heads up on the ebay listing, they do like to exagerate stuff....worst comes to worst i can test these "100w"peltiers when they arrive and if they are not what they say the seller or ebay should refund me my money.
post #10 of 11
Since ur a trained refrigeration tech, would it not be better for you to build a 'quiet' phase change unit.

Not a Direct phase unit, but one that can be used to chill the water in a normal loop.
Not super powerfull to get -80c, but just strong enough to keep temps below ambient.

Small compressors used in Aquarium chillers for example are not that loud, 1/4Hp or even 1/8Hp ones.

Hailea chillers have been used with success for example. Im sure you could build somthing urself if u want a DIY project, maybe even for less than the retail cost of a Chiller.


(BTW iv done a bunch of research and designing for a Sub Zero Modified Hailea Chiller build that im going to eventualy undertake, so i know they can be quiet, especialy if u build a large res into the system for a buffer so that the chiller doesnt cycle on all the time)
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