I guess that the mobile generator may consume 205 kW fuel. often they are watercooled and the exhaust gases are of course blown out, only a fraction will be left in the room as losses. Ask the supplier of the generator abou this figure. My guess is 40kW. If the outdoor air is 30 C. Then the air...
I agree with you. This must be correct.
It is a question of difference in behaviour between long wave and short wave radiation. I have interpreted the literature just as you have done.
My guess is that the scaling is caused by boiling of the water which means that the residuals could remain on the surfaces. Could it be worth the effort to try to increase the water flow so that the water does not boil?