Maximum solar heat gain factors for externally shaded glass
Values based on a ground reflectance of 20%
From ASHRAE (1989), with permission
Notes:
Month | Btu/hr·ft2 for given orientation | |||||
N |
NE/NW |
E/W |
SE/SW |
S |
HOR |
|
Jan |
31 | 31 | 34 | 37 | 38 | 16 |
Feb |
34 | 34 | 36 | 38 | 39 | 46 |
Mar |
36 | 37 | 39 | 40 | 39 | 17 |
Apr |
40 | 41 | 42 | 41 | 40 | 24 |
May |
43 | 45 | 45 | 41 | 40 | 28 |
Jun |
45 | 47 | 46 | 41 | 40 | 31 |
Jul |
45 | 46 | 47 | 42 | 41 | 31 |
Aug |
42 | 43 | 46 | 43 | 42 | 28 |
Sep |
37 | 38 | 41 | 42 | 41 | 23 |
Oct |
34 | 34 | 38 | 40 | 40 | 19 |
Nov |
32 | 32 | 34 | 38 | 39 | 17 |
Dec |
30 | 30 | 32 | 36 | 37 | 15 |