Good afternoon everyone,

I am working on a completely enclosed box with a few electronics components generating heat inside.  The box will be in a air conditioned 70 degree room and I am assuming the aluminum box will transfer heat from the inside to the ambient 70 degree air outside.  Without any inlet or outlet boundary conditions could someone help point me in the right direction for how to setup this type of process.  My goal is to 1) determine the steady state temperature distribution throughout the box, and 2) determine the time it takes to reach steady-state from an initial condition of 70 degrees inside the box. 

Any help would be greatly appreciated.

-Stephan