I am using the Discrete Ordinate Radiation Model and Solar Loading to incident light rays on the top of the glass plate. My model has a glass plate of 3 mm thickness, and below that, the air is flowing, and there is also an absorber plate of 1mm thickness. The walls are insulated to avoid any losses.

However, the question remains, what temperature "glass" should have with respect to the air at the "outlet"? Should it be higher or lower?

Please, provide a logical explanation along with the answer.

Thanks.