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What's best for transferring heat?

post #1 of 8
Thread Starter 
I'm working on a little project that i need some advice on.

Very simply, i want to transfer heat from one end to another, just a short distance of about 10 centimeters.
What would be best to get the heat quickly from A to B given all options are the same dimensions.

A. A copper tube.
B. A copper tube filled with water.
C. A copper tube that is massive (not hollow) ((even tho this is expensive!)
D. A copper tube smashed flat.

It's some custom cooling i'm working on, thanks, and if it works well ill share my experience! smile.gif

*Edit**

I was unclear on one thing, The goal is actually heat loss. So any loss during the transfer is more then welcome!
Edited by unseen0 - 11/1/13 at 11:22pm
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post #2 of 8
Flattening your tubes on the ends will increase the surface coverage, and improve the cooling capacity.
As for filling it with water, just like air, water is an isolator, so I very much doubt it would help at all, if anything the water would heat up and hinder the ability of the tube to draw out the heat.
As for thickness, the thicker the tube, the better the results.

Hope this helps!
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post #3 of 8
Thread Starter 
Quote:
Originally Posted by Leyaena View Post

Flattening your tubes on the ends will increase the surface coverage, and improve the cooling capacity.
As for filling it with water, just like air, water is an isolator, so I very much doubt it would help at all, if anything the water would heat up and hinder the ability of the tube to draw out the heat.
As for thickness, the thicker the tube, the better the results.

Hope this helps!

Yes it does help thank you! Few Q's tho smile.gif

If i do multiple, say two. Would it be better to use 1 pipe that is 1 inch or 2 pipes that are 1/2 inch each?
I always tought seperate pipes would be better to transfer heat.

**I might have forgot to mention, the goal is actually heat LOSS, so any loss during the transfer is greatly helpfull!
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post #4 of 8
If you know anything about recent heatsinks, or maybe even not-so recent, they have much to do with the very question you are asking. Modern heatsinks utilize a certain liquid chemical that, when heated, turns into vapor which then transfers the heat, and the vapor will return to liquid when cooled.

As for what works the best, I generally use the standard surface area is most important in dissipating heat, but transferring is a different question. Although not an exact answer, you would want to think "How fast would heat travel to the other end if I held a lighter to the first end?" I would almost have to guess that the copper without an inner core would be better.

EDIT for typo
Edited by Sm0keydaBear - 11/1/13 at 11:24pm
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post #5 of 8
Thread Starter 
Quote:
Originally Posted by Sm0keydaBear View Post

If you know anything about recent heatsinks, or maybe even not-so recent, they have much to do with the very question you are asking. Modern heatsinks utilize a certain liquid chemical that, when heated, turns into vapor which then transfers the heat, and the vapor will return to liquid when cooled.

As for what works the best, I generally use the standard surface area is most important in dissipating heat, but transferring is a different question. Although not an exact answer, you would want to think "How fast would heat travel to the other end if I held a lighter to the first end?" I would almost have to guess that the copper without an inner core would be better.

EDIT for typo

Exactly, that's the question i asked myself. Any of those options would be best to transfer the heat. And given the thermal condictivity, my initial tought was solid copper as well.
I'm aware of heatsinks and their functionality on vaporizing acetone and that being an exellent way to transfer heat, i just can't make those myself! And this concept made me think about adding Water to the debate since that's another liquid.

Any1 else might have input or know the answer to the fastest heat travel?
The lighter question is an excellent example!
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post #6 of 8
What are you transferring the heat from? How are you going to connect the copper to the heat source?

And how are you going to cool the other end? If it is going to be passive, then you are limited by transfer of copper to the surrounding air. In that case more surface area (i.e. tube) is going to be better than a solid rod. Or even a tube with holes to help convection.

Whereas if you have some kind of heat sink at the other end then a solid rod has more cross section to move the heat.

If you can tell us what is happening at either end, we could probably figure out approximately how many watts you could dissipate.
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post #7 of 8
You are trying to build a heatpipe. First thing you must know about them is that they have no air (or very little) inside. They also have a liquid in them. It's like an evaporator tube in your fridge. For electronics water is enough, but you should make sure the inside of your tube does not get destroyed by water constantly evaporating and condensing.

Partial vacuum allows you to control the boiling point of water inside your heatpipe — less pressure means smaller temperature, and more pressure means higher temperature. This means you should find a balance between your operating temperature (how much heat your component gives off) and your cooling efficiency (how much heat your radiator can remove from the system) because you don’t want to have your water never condense into liquid again, and you don’t want your water to evaporate when it is too late and your chip becomes unstable.

This is also the reason why the cold end of the heatpipe must always be above the hot end of the heatpipe (i.e. your rad must be elevated from the chip relative to sea level, though you may choose to keep it so far apart that the elevation would be so subtle you wouldn’t see it). As your heat interface evaporates, it will travel upwards into the cold part, get condensed and travel downwards to the hot part.

If you are curious enough, you may want to get a few actual heatpipes and saw them apart to see what’s inside.
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post #8 of 8
Quote:
Originally Posted by unseen0 View Post

A. A copper tube.
B. A copper tube filled with water.
C. A copper tube that is massive (not hollow) ((even tho this is expensive!)
D. A copper tube smashed flat.

All the options are bad, but C is the best of them.

A heatpipe does seem to be what you are looking for, but none of these options are heatpipes.
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