first of all thanks on the commet
in the first pic I put a temprature constraint because the floor is on the ground where the temp is prety still, now when i think about it maybe I should change it to condaction
the second pic is for the all other 5 walss in the cube (exept the floor) where I pot the radiation (its in a hot place with direct sinlight) and naglectic wind
in the third pic I add a convection in the ventilator (the ventilator rpresnt as the hole I created), when I add this I get error like in this pic 
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