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Daylight availability: global and diffuse Evgh, Evd--Algorithm
1.31
These empirical equations give the frequency distributions of global
illuminance (the illuminance on unobstructed ground from both skylight and
sunlight), and of diffuse illuminance (skylight alone). By computing first the
solar altitude at regular intervals of time through the day, for every day of
the year, and then the distribution of illuminance at these times, the total
annual hours that a given illuminance is exceeded can be found.
The equations are based on measurements made at Nottingham UK and may be
applied to other sites in north- west Europe with similar climate.
- a. Global illuminance
- Input
- Solar altitude, gs radians
- Equation
- The mean global illuminance, in kilolux, under actual skies is
- The fraction of the mean illuminance at solar altitude gs exceeded on
95%, 90%, ... 10% and 5% of occasions is as follows:
| percentile |
|
| 95% |
0.15 |
| 90 |
0.26 |
| 80 |
0.32 |
| 50 |
0.90 |
| 20 |
1.56 |
| 10 |
1.83 |
| 5 |
1.98 |
- Source
- Tregenza(1)
- b. Diffuse illuminance
- Input
- Solar altitude, gs radians
- Equation
- The mean diffuse illuminance, in kilolux, under actual skies is
- The fraction of the mean illuminance at solar altitude gs exceeded on
95%, 90%, ... 10% and 5% of occasions is as follows:
-
| percentile |
|
| 95% |
0.23 |
| 90 |
0.35 |
| 80 |
0.52 |
| 50 |
0.96 |
| 20 |
1.40 |
| 10 |
1.60 |
| 5 |
1.80 |
- Source
- Tregenza(1)
References
- Tregenza P R Measured and calculated frequency distributions of daylight
illuminance Lighting Research and Technology 18 (2) 71-74 (1986)
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