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Questions about copper...

O

Obliterous

n00b
Joined
Jun 5, 2004
Messages
14
I have an oficiallpletora of copper tubing, and got a crazy idea...

What can you folks tell Me about the thermal transfer properties of copper tubing?

Assuming 3/8in ID--1/2in OD:

How many watts can I expect to disipate per foot, assuming a temp difference of 20-25 f?

would a 30 foot coil be suficient to achieve a 15f drop, assuming an ambient temp of 75f, and a peak hot-side temp of 125f ?

15 feet? more? less?

Feed Me numbers, please...
 
not sure about exactly how efficient copper tubing is at getting the heat away. But I can tell you it'd be hell for your pump
 
Not too woried about what it would do for the pump, yet. I know a few ways to deal with that problem...
 
I may have had roughly the same crazy idea. Does it involve solder, a copper plate and bending tubing? I scrapped my idea because copper tube couldn't bend sharp enough without collapsing.

So what IS your idea?
 
Obliterous said:
I have an oficiallpletora of copper tubing, and got a crazy idea...

What can you folks tell Me about the thermal transfer properties of copper tubing?

Assuming 3/8in ID--1/2in OD:

How many watts can I expect to disipate per foot, assuming a temp difference of 20-25 f?

would a 30 foot coil be suficient to achieve a 15f drop, assuming an ambient temp of 75f, and a peak hot-side temp of 125f ?

15 feet? more? less?

Feed Me numbers, please...
Click to expand...


This is impossible to determine without knowing water flow characteristics inside and airflow characteristics outside the tubing. First off, you really want your water 20-25F above room temperature? Then what's that 125F peak hot side temp number?
 
I used to use a 3/8 copper tube as my radiator. First it lived on my cyrix PR200 overclocked to 200MHz. Then moved to a celery 400. Temps weren't that much over ambient. I don't remember the lenght, but it was the standard tube to feed an ice maker.
 
copper tubing by itself is not very good at transfering the heat out of the water. That is why most radiators use LOTS of fins as well as FANS to move the air and help facilitate the transfer of heat. If it were efficient to simply use a coil of copper tubing...well we all wouldn't be using radiators.
 
I don't have an answre, but I know in the early days of overclocking I saw a lot of coiled copper tubing on box fans, but a radiator is a much better way to get rid of the heat; because of the vast surface area difference.
 
That's really all i was saying. In the "old days", there wasn't THAT much heat to get rid of so it wasn't too bad. If you were to do it now, i would keep it in a water bath and use evaporative cooling
 
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