Our company builds rather large video walls that are driven by computers next to them. In one of our current project the size of the installation is 21 55" displays side by side in portrait mode and 4 computers. The total heat dissipation would be maximum 8000 W, distributed evenly along the housing. This whole setup is in a standalone, about 15 meters long installation. Both the displays and the computers implement forced heating internally.
The interior decoration company that builds the housing asked the question: How big and what kind of ventilation holes should they plan for?
I was searching the net and found certain solutions and online calculators (https://www.engineersedge.com/heat_transfer/convection.htm), also a related question here on Engineering (How to design a cooling chimney for a computer server?) but these are concerned with surfaces being cooled.
In my case the surfaces are irrelevant -I would think- as all devices have forced cooling, therefore I should care about the warm air they produce and push out of their individual chassis.
Please give me a handle, what is the best approach to calculate the venting hole requirements.