# Heat transfer btw two plates

Hi, I have an easy problem for you I think but I'm not a specialist in thermo problems.
Here is my problem.

## Homework Statement

2 plates in aluminum, one at T1=230°C and the other one at T2=30°C. In between, some air or something else (I don’t know yet).

## Homework Equations

Equation of conduction but I don't really understand how to use it... Is it the only one to use?

## The Attempt at a Solution

So I would like to know what would be the evolution of T2 depending of the time and the distance btw the two plates.

Max

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supratim1
Gold Member
explain your question clearly. you can use radiation transfer too, but relevant info for that is not given in the question.

Hi,

Ok sorry, I do it again.

I have a heating element which warm up a plate of aluminium to 230°C. Then I have a other plate of aluminum I want to heat up to a different temperature. So I would like to find the gap between the two plates I need to reach my temperature for the 2nd plate (If I suppose that I have only air in between and the needed temperature is about half of T1).

That's the only informations I have. I don't ask you to give me the answer but to give me what I need to resolve the problem. As I said before, I got the conduction equation but I not even sure that it's relevant with air...

Max

supratim1
Gold Member
value of thermal conductivity of air and the separation between plates is needed to solve the problem. the question is still vague.

As the thermal conductivty depends of the temperature, I would just just 0.3 for this value. The gap is what I want to define if I want to get a temperature T2 of 150°C...
What equation(s) should I use then?

supratim1
Gold Member
thermal conductivity depends on temperature? does it?