Scaling down a building
 

Hello guys,
I am looking at using LES to model natural ventilation inside a building. I am supposed to model a building with occupants. Obviously i can not model the building with the same dimensions. I am thinking of scaling down the dimensions of the building. But dont know how to scale down the heat source (occupants). I mean initially the building has around 33W/m^2..... so if i scale down my building what should be the heat source then? Thank you, you experts out there. :)

Why scale it?
 

Why is it obvious that you can't model the building with the same dimensions?

Why must you scale it?