UFC 3-400-02
28 FEBRUARY 2003
Figure 2-16. Sample Data Set Page 16
Average Annual Solar Heat and Illumination Nearest Available Site
(Source: National Renewable Energy Laboratory, Golden CO, 1995)
AVERAGE TRANSMITTED SOLAR RADIATION (Btu/sq.ft./day) FOR DOUBLE GLAZING, Percentage Uncertainty = 9
Jan
Feb
Mar
Apr
May
Jun
Jul
Aug
Sep
Oct
Nov
Dec
Year
HORIZ
Unshaded
450
640
870
1150
1350
1480
1470
1300
1040
770
480
370
950
NORTH
Unshaded
150
190
250
300
370
410
390
330
260
200
150
130
260
Shaded
130
170
220
270
330
370
350
300
240
180
140
110
230
EAST
Unshaded
320
410
530
660
750
810
810
750
620
500
320
270
560
Shaded
290
370
470
570
650
700
700
650
550
450
290
240
490
SOUTH
Unshaded
810
810
740
630
510
470
490
600
750
870
760
700
680
Shaded
790
750
590
420
350
360
360
390
550
770
730
680
560
WEST
Unshaded
320
420
520
650
740
790
800
740
620
490
330
270
560
Shaded
290
370
460
570
640
680
690
640
550
440
300
240
490
AVERAGE INCIDENT ILLUMINANCE (klux-hr) FOR MOSTLY CLEAR AND MOSTLY CLOUDY CONDITIONS, Percentage Uncertainty = 9
March
June
9am
11am
1pm
3pm
5pm
9am
11am
1pm
3pm
5pm
HORIZ.
M.Clear
40
73
82
64
26
48
84
101
96
67
M.Cloudy
23
45
52
40
16
32
61
76
71
49
NORTH
M.Clear
10
14
15
13
8
19
16
17
17
15
M.Cloudy
9
16
17
14
7
15
18
19
19
16
EAST
M.Clear
75
56
15
13
8
78
72
31
17
15
M.Cloudy
25
30
17
14
7
40
49
27
19
16
SOUTH
M.Clear
40
73
82
64
26
12
31
45
41
19
M.Cloudy
17
36
43
32
12
12
26
37
33
18
WEST
M.Clear
10
14
24
67
64
12
16
17
53
78
M.Cloudy
9
16
21
33
22
12
18
19
41
50
M.Clear
(% hrs)
32
28
27
28
29
43
39
32
29
34
Sept
Dec
9am
11am
1pm
3pm
5pm
9am
11am
1pm
3pm
5pm
HORIZ.
M.Clear
29
68
86
78
47
16
42
48
30
2
M.Cloudy
17
42
58
53
31
9
25
28
17
2
NORTH
M.Clear
9
14
16
15
12
6
10
11
8
1
M.Cloudy
7
15
18
17
12
4
10
11
7
1
EAST
M.Clear
65
70
28
15
12
42
39
11
8
1
M.Cloudy
23
36
23
17
12
11
18
11
7
1
SOUTH
M.Clear
21
57
75
67
37
39
82
88
63
6
M.Cloudy
11
31
45
41
21
10
29
32
20
2
WEST
M.Clear
9
14
16
54
74
6
10
22
50
9
M.Cloudy
7
15
18
35
35
4
10
14
17
2
M.Clear
(% hrs)
47
47
41
41
43
31
30
30
30
32
33
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