I am completing a multizone simulation in WUFI Plus and have a question regarding the distribution of solar gains. For my interior partition that separates two zones, I notice the solar gains box includes an additional field: solar radiation on external surface (to zone 2). The value cannot be edited even when I set user defined solar gains in Other Parameters. I would like to know what this field is describing, since the exterior surface in this case (zone 2) has no windows, so it cannot receive solar radiation. I've attached an image of the field in question. Please advise if more information is required. Thanks in advance.
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