Referring to Figure 5.19, prove Equation 5.46 for the angle of incidence. Use direction cosines of the sun-ray vector and a vector normal to the tilted surface to find the angle between them. Dot product of two unit vectors gives the cosine of the angle between them.

Figure 5.19

Equation 5.46

Transcribed Image Text:

W 90 N YA 90 aw E Solar altitude angle Solar azimuth angle Panel tilt angle Panel azimuth angle Incident angle a a, B aw