Defining solar power / solar heat flux

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There would be more than one way IMO. One option:

• Select target surfaces, and set their Sun Exposure field to "NoSun"
• Pick a layer in their referenced construction and make it an internal heat source.
• Link the new layer to a low radiant heating system.
• Calibrate as to achieve your equivalent solar power (q), e.g. intensity, schedule
• Make sure to isolate and subtract the injected heat from your building electric use.