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I would like to compare some results from different models including window heat addition (WHA) and I wonder what exactly is WHA. Is this only directly transmitted solar energy through the glazing (primary transmittance) or is the energy absorbed by the glazing and subsequently transferred inwards by convection and radiation (secondary transmittance) also included in it?

I would like to compare some results from different models including window heat addition (WHA) and I wonder what exactly is WHA. Is this only directly transmitted solar energy through the glazing (primary transmittance) or is the energy absorbed by the glazing and subsequently transferred inwards by convection and radiation (secondary transmittance) also included in it?