Minimum recommendation
This is to be checked in the reference point at the centre of the window width and at the
inner surface of the aperture (façade and/or roof). For multiple apertures in different façades it is possible to cumulate the time of sunlight availability if not occurring at the same time. The reference point is minimum 1.2 m above the floor and 0.3 m above the window sill (whichever is higher).
NOTE 1 To allow flexibility for rooms orientation the angle of window normal αwn,s = 120° measured from South and the minimum sun height γs,min are applied. Solar altitudes below those stated in Table D.1 (BS EN17037 guide) are neglected in the evaluation.
Minimum recommendation for exposure to sunlight
The minimum recommendation is that the room should receive possible sunlight for a duration higher than 1.5 hours (supposed to be cloudless) on March 21.
Table A.5 proposes three levels for exposure to sunlight.
| Recommendation | Sunlight Exposure (Hours) |
| Minimum Exposure | >= 1.5 |
| Medium Exposure | >= 3.0 |
| High Exposure | > 4.0 |
Table A.5
Run calculation
The test date can be changed on Project Settings > Climate Daylighting tab.
The default date is set for March 21.
Open Run dialogue and select Sunlight Exposure to run the calculation.
