Total zone heat gain by external loads

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My model is an office building in which the thermal zones located in the extent of the building are modeled by a solid wall surfaces with fixed window has sub-surfaces. I want to evaluate the relation between the solid wall stored heat gain to the total zone heat gain. How can I present the total zone heat gain through radiation, conduction, and convection? I do know how to evaluate the stored heat inside the solid wall but I can't figure out about the zone heat gain.