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Water Chamber Thickness

post #1 of 13
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well guys, i'm thinking about making a waterblock for the watercooling that i'm making this spring and i was wondering about what thickness would be good for the waterchamber. and also. would aluminum also work for a waterchamber, or even anywhere else on the waterblock, because its a heck or alot cheaper. thanx alot guys for your help in advance
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post #2 of 13
Copper cools much better, but essentially they are the same. Just do not mix copper and aluminum in the same loop. That will cause corrosion.
As long as you keep the chamber the same area as you tube. IE, a 1/2" diameter tube is about .25" in area (5.x.5), so if the chamber is 1" wide, keep it .25" deep.
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post #3 of 13
Here is some actual data and equations on heat transfer that I put together. (I'm a physics student)

Thermal Conductivity of Substances (k in the equation):
(J/m*s*C)
Aluminum: 240
Copper: 390
Iron/Steel: 46
Silver: 420
Water: .57
Air: .024



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post #4 of 13
I have pics and diagrams of different types of waterblocks for the asking. I made my blocks with roughly 1/4" outside walls and my base plates are less than
.080" (2mm). Use copper if you can but it wouldnt be a bad idea to practice on some aluminum.
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post #5 of 13
I made my own waterblock out of aluminum. Aluminum is way easier to machine than copper. My chamber was based off this design
The more material you use, the more heat it will absorb. I used two half inch thick plates(2"x 2" x .5") and one .25 inch thick one. One of the half inch thick plates was used for the chamber and one for the bottom. The top plate was used for the barbs, and mounting holes.
So yeah, theres nothing wrong with building an aluminum block. If you want max heat cond. use more aluminum, but remember to use an aluminum radiator. I'll try to get pics of my setup soon.
post #6 of 13
Quote:
Originally Posted by JayJay
I made my own waterblock out of aluminum. Aluminum is way easier to machine than copper. My chamber was based off this design
The more material you use, the more heat it will absorb. I used two half inch thick plates(2"x 2" x .5") and one .25 inch thick one. One of the half inch thick plates was used for the chamber and one for the bottom. The top plate was used for the barbs, and mounting holes.
So yeah, theres nothing wrong with building an aluminum block. If you want max heat cond. use more aluminum, but remember to use an aluminum radiator. I'll try to get pics of my setup soon.
You are wrong, you goal is not for the aluminum to absorb heat, but rather transfer it to the water! The equation for Thermal Conductivity is inversley proportional to the thickness of the material, making a thicker water block worse.
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post #7 of 13
The aluminum absorbs the heat, so where does the heat go from there? To the water. Also, the heavier/more massive the block, the more heat it conducts
* copper has a conductivity that is 70% better { 1.70 }
* aluminum has a conductivity that is 59% of the copper one {0.587 }

Thus we take 70% more aluminum and get the

* weight advantage on capacity of aluminum is down to 38% better than copper { 1.38 }
* volume advantage on capacity of copper is increased to 2.38 fold against aluminum { 2.38 }

for a unit length of equally good conduction
So when heat has to be dumped, the more the better, the quicker
the better, the results are :
If weight or cost is a concern, aluminum is favoured,
if volume is a concern, copper is better.
post #8 of 13
Quote:
Originally Posted by JayJay
The aluminum absorbs the heat, so where does the heat go from there? To the water. Also, the heavier/more massive the block, the more heat it conducts
* copper has a conductivity that is 70% better { 1.70 }
* aluminum has a conductivity that is 59% of the copper one {0.587 }

Thus we take 70% more aluminum and get the

* weight advantage on capacity of aluminum is down to 38% better than copper { 1.38 }
* volume advantage on capacity of copper is increased to 2.38 fold against aluminum { 2.38 }

for a unit length of equally good conduction
So when heat has to be dumped, the more the better, the quicker
the better, the results are :
If weight or cost is a concern, aluminum is favoured,
if volume is a concern, copper is better.
I am not sure where you have learned this, but it is wrong

Just examine the equation for Thermal Conductivity.

dQ/dt = kAdT/D

Thermal Conductivity is directly proportional to the surface area of the material, difference in temperature and inversely proportional to the thickness of the material.

Therefore the only ways Aluminum could have a equal thermal conductivity as copper is the following:
1. Increase the surface area of the Aluminum comming in contact with the processor, this would require a redesign of the processor to make its surface area larger....
2. Increase the constant of conductivity, this would require making the aluminum more dense, which in effect is what you are trying to say... Expect for their is no way to do this
3. Increase the temperature difference, chiller anyone?
4. Make the thickness of the aluminum smaller than that of the copper. But, why not just decrease the thinkness of the copper?

Quote:
Also, the heavier/more massive the block, the more heat it conducts
Mass is not present in this equation that has been accepted by all physicists for hundreds of years. Adding "bulk" to the system will NOT help!
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post #9 of 13
Quote:
Originally Posted by JayJay
* copper has a conductivity that is 70% better { 1.70 }
* aluminum has a conductivity that is 59% of the copper one {0.587 }
This does not make sense? How can copper conduct 70% better than aluminum, but aluminum only conducts 59% that of copper?!?!?!
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post #10 of 13
Thread Starter 
lol hes got a good point there, but still, thanks alot guys for the help with everything. also, there was another thing that i was wondering about. how thick should i make the, shall we say, cover of the water chamber. you know, the part that sits on the cpu. that should be very thin am i correct?
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