Question-and-Answer Resource for the Building Energy Modeling Community
 | 1 | initial version |
The profile angle is the angle the direct solar radiation makes with a horizontal line in a vertical plane that is perpendicular to the surface. The other angle is the angle the direct solar radiation makes with the normal to the surface.
For controlling venetian blinds with horizontal slats, the profile angle is appropriate. For vertical blinds, or other shades which have properties depending on both the profile and azimuthal angle, the profile angle is less appropriate.
