Good afternoon everyone,

I am working on a completely enclosed box NEMA 4x enclosure with a few electronics components generating heat inside. The box will be in a 50 degree ambient temperature room and I am assuming the aluminum box will transfer heat from the inside. The heat generated from each of the LCD screen is about 36 W. I don't know exactly how to set up the boundary conditions for this problem.

Without any inlet or outlet boundary conditions could someone help point me in the right direction for how to setup this type of process. Can someone help me how should I get started with the process. Should I use radiation for this model? This application will be placed outside in gas stations.

My goal is to 1) determine the temperature distribution inside the box, and 2) Temperature inside the box if I give the heating sources as PCB,heating pad ,LCD screen.

Any help would be greatly appreciated.

The box don't start at 70deg. It start at outside temp. Box temp start to go up when electronic power up. Electronic power use is the power used to heat up the box. Now you can calculate box steady-state to find box temp and time to reach that temp.