Monthly calculation according to EN 832

For every month M and orientation O, the effective g-value gSWH,M,O has to be calculated (as a simplification, the constant value for hemispherical irradiation can be used). Then the solar gains are calculated exactly as the gains from windows, using a frame reduction factor. For the heat losses, the resistance of the TI section and the frame section have to be considered. In some cases, like the transparent exterior insulation finish system, the notion of 'frame' is ambiguous. 'Frame' and 'opaquely insulated wall' are identical. Furthermore, in transom mullion systems, frames might partly be used for transparent insulation and partly for glazings or operable windows. The definition should be consistent within one project.

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