Heat loss due to steel immersion
Heat loss due to steel immersion
(OP)
Hi,
I would like to ask You to help me with following problem. What will be the heat loss due to 200 kg steel immersion in a solution of water at 60C for 4 minutes.
Tom
I would like to ask You to help me with following problem. What will be the heat loss due to 200 kg steel immersion in a solution of water at 60C for 4 minutes.
Tom





RE: Heat loss due to steel immersion
RE: Heat loss due to steel immersion
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RE: Heat loss due to steel immersion
Q/dt=m*c*dT
but I have 2 unknown.I understand that we are dealing with natural convection but I'm not sure which model use.
RE: Heat loss due to steel immersion
Is this a school assignment of any sort?
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RE: Heat loss due to steel immersion
If steel is <60*C initially, then some.
If steal is >60*C initially, then less than none.
RE: Heat loss due to steel immersion
RE: Heat loss due to steel immersion
OK! I hope You will have sympathy for me. English is not my native language. Additionally I wasn't precise.
I have following problem. I have rectangular processing tank: dimensions 4x1,5x0,9 m. Volume of tank 5,4m3. Medium is water at 60C. Three times per hour I will immerse 200 kg of steel at 0C. Time of immerse is 4 minutes for each 200 kg of steel. Water is not mixed.
I have heat loss from open surface, wall and bottom. I can't determine hest loss du to steel heating.
I'm not a student but unfortunatelly I should go back to school.
I hope I was more precise.
RE: Heat loss due to steel immersion
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RE: Heat loss due to steel immersion
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RE: Heat loss due to steel immersion
RE: Heat loss due to steel immersion
The (very cold!) steel will cool the water, but you have a lot of heat loss also from the water evaporating, the water losing heat into the air from above, below and the 4 sides of the tank - why is it not insulated?
So, how are you going to reheat the water back to 60 C after each immersion of the steel?
Your problem makes little physical sense.
RE: Heat loss due to steel immersion
If you navigate to the Spirax Sarco website and search for "heat loss from tanks and vats", you will find excellent treatment of the subject matter; they even have worked examples based on rectangular tanks. Add to that the heat gained by the immersed steel, and your problem will be solved.
RE: Heat loss due to steel immersion
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RE: Heat loss due to steel immersion
That implied to me that the tank heat loss to the environment is something that the OP is at least thinking about in addition to the head gained by the steel.
RE: Heat loss due to steel immersion
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RE: Heat loss due to steel immersion
You are trying solve rate of heat transfer problem, correct?
Neglect transient for a while and calculate steady state natural convection
and multiply that value with 240, you will get value of heat loss water in joules
By the way what is the shape of steel you immerse?