We all know that LB Incident Radiation calculates the radiance through the sky matrix, but I hope to use geometric formulas to verify the radiance. So I selected a plane and calculated the incident angle of sunlight based on the sun’s direction. Then, I multiplied the sine value of that angle by the direct normal irradiance at that moment to obtain the irradiance value. Surprisingly, this value turned out to be several times larger than the value of the LB incident radiation. What could be causing this disparity?"
Just seeing the numbers at the right side of the image, seems to be that one results is in Wh and the other in kWh. Can be?
-A.
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Thanks for your reply, but after unit conversion, the geometric formulas method is 838kWh and the LB Incident Radiation is 280kWh.