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So for example, I have a window which (which has a slope of 90°, vertical) is oriented 20° from the south (clockwise is positive). I know what the incidence angle is and I know that I should use the formule for 'Total radiation on tilted surfaces' which is explained on page 100-101 in the pdf. Starting from the total irradiation in the east, south and west known from my weatherstation, does someone know how to use these measurements to calculate the total irradiance on my window in W/m²?

I hope this explanation is clear enough!

Thank you in advance.