Mean radiant temperature when windows are opened

Hi, I am studying the impact on MRT of opening the windows with comfort maps. When the windows are open I need account for the increase of solar radiation but more importantly the radiant temperature through the opening.
So far I tried increasing the transmissivity of the operable windows to 99% when they are opened. However I am wondering if there is a way to consider a real opening (100% transparent) or if it can be implemented in the future?