Remove temperature from welded copper piece

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joop12
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heat transfer from welded copper piece

Hello everybody,

I am designing a machine where i have a welded copper piece which i have to cool it from 800 c to 100 c
i m using normal flow water.please guide me how much water , flow rate, and pressure do i need.I have maximum 40 sec to bring it 100 c temp.in order to select water pump and tank.
Data:
40 sec
size of copper piece: LxBxW : 8 x 20 x 120
cooling : from 800 c to 100 c
 
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Welcome to PF, Joop.
I probably can't help you at all, being uneducated, but a couple of parameters seem to be missing from your scenario. The first of those is what units you are using. You say that the pipe is 8 x 20 x 120, but you don't say whether that is mm's, cm's, inches, metres, miles... I rule out lightyears because you wouldn't have had time to build it.
People familiar with the subject might already know, but I personally would have to ask about the chill characteristics of the weld. Some don't handle rapid cooling very well.
Please believe that I'm not putting you down; I just think that you have to provide more information before a reasonable analysis can be made.
 
Danger said:
... You say that the pipe is 8 x 20 x 120 ...
Actually, it just says "welded copper piece". It could be a finned heat-sink, or even a solid block of copper.

Is it just a piece of copper coming out of a furnace, or is it connected to some additional piece of equipment? Are you planning to flow coolant (I doubt water will help much at 800° C) through the piece, or just spray it in open air? We also need the ambient temperature and the coolant/water temperature.
 
sorry i forgot to mention size..it is in (mm).basicaly i am wraping 41 times the copper band which is 0.2mm thin around a plate.then i would weld them after welding i have to cool this to 100 c from 800 c for further opertaions.I would use normal water to flow at 20 C .in order to select water tank and pump sizing I need water flow rate, pressure. and moreover working temerature range of room also should be around 40 c.Please guide me and give me formulas
 
Danger said:
Welcome to PF, Joop.
I probably can't help you at all, being uneducated, but a couple of parameters seem to be missing from your scenario. The first of those is what units you are using. You say that the pipe is 8 x 20 x 120, but you don't say whether that is mm's, cm's, inches, metres, miles... I rule out lightyears because you wouldn't have had time to build it.
People familiar with the subject might already know, but I personally would have to ask about the chill characteristics of the weld. Some don't handle rapid cooling very well.
Please believe that I'm not putting you down; I just think that you have to provide more information before a reasonable analysis can be made.

sorry i forgot to mention size..it is in (mm).basicaly i am wraping 41 times the copper band which is 0.2mm thin around a plate.then i would weld them after welding i have to cool this to 100 c from 800 c for further opertaions.I would use normal water to flow at 20 C .in order to select water tank and pump sizing I need water flow rate, pressure. and moreover working temerature range of room also should be around 40 c.Please guide me and give me formulas
 
pantaz said:
Actually, it just says "welded copper piece". It could be a finned heat-sink, or even a solid block of copper.

Good catch. I'm not sure where the idea of a pipe came from, unless perhaps because of the mention of water flow. My mind is easily derailed.