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Page 6 of 72
ST0133 – A 02/09
SOLAR
Figure 3 – UK and Ireland irradiation map (horizontal surface)
3.1.2 Orientation
The solar irradiance shown in Figure 3 is an average value incident on the horizontal
surface. As mentioned above, depending on the orientation and inclination of the solar
collector the incident radiation onto the collector surface can vary although it might be
in the same location.
The terminology used to describe the exact location and orientation of a solar collector
is described in Figure 4. The terms indicate:
- longitude: geographic coordinate for East/West measurement
- latitude: geographic coordinate North or South of the equator
- slope: angle between the horizontal and the collector plane
- azimuth: angle between South and the perpendicular to the collector pane (West
+90°, South =0°, East -90°)