I am trying to run a Convective heat transfer analysis on a double facade cavity that works during the winter as a thermal buffer zone with no air inlets/outlets (so in reality only slightly ventilated) and to see the temperature fluxes inside the cavity, by warming it up only with the solar radiation as an additional radiative source on the external reflective textile skin which I assigned to have a transparent radiative behaviour.
I used a value of 1000 W/m2 that I derived from a radiation analysis and assigned 13oC as an initial boundary temperature and 10oC as an ambient one. For simplification, I assumed that the rest of the boundaries are adiabatic. I ran different simulations with slightly changed settings for the outer layer to have either a layer wall thermal and account for the conductivity of the skin or no thermal wall.
However, in all the cases, the temperature results seem to be too high inside the cavity, so I would like to ask if I am understanding something wrong in terms of the settings or the behaviour of the model and what the boundary and material conditions should be.
Here is the link to the project:
Any insight would be more than welcome.