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Remove temperature from welded copper piece

  1. Dec 24, 2011 #1
    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
     
    Last edited: Dec 24, 2011
  2. jcsd
  3. Dec 25, 2011 #2

    Danger

    User Avatar
    Gold Member

    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.
     
  4. Dec 25, 2011 #3
    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.
     
  5. Dec 26, 2011 #4
    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
     
  6. Dec 26, 2011 #5
    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
     
  7. Dec 26, 2011 #6

    Danger

    User Avatar
    Gold Member

    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.
     
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