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CHAPTER .12
1951, Guide
Table 16. Instantaneous Rates of Heat Gain Due to Transmitted Direct and Diffuse or Set Solar Radiation bt a Single Sheet of Unshaded Common Window Glass
For Clear Atmospheres and IS Deg Declination, North (August 1)
Note: For total instantaneous heat gain, add these valises to the Table 11 values.
AM-*
i 6 aAn.
10
6 pan. 5
3
2
PMt -*
N
25 23 16 16
17 18 18
N
' 30 Deo Nobth Latitude Instantaneous Heat Gain in Btu pbb (hb) (bq ft)
NE E SE s SW W NW
98 155 148 106
54 20 19
NW
108 190' 205 180
128 59 19
W
52 110 136 ' 136
116 78 35
SW
5 10 14 21
34 45 49
8
5 10 13 15
17 19 35
SE
10 13 13 15 15
16 18 18 19 19
E NE
Hobiz.
195 276 Hobiz.
40 Deg Nobth Latitude
AM-* i 5 ajn. 6 7
7 p.m. 6 5
93 11
N
20 25 12 13 14 15 16
N
Instantaneous Heat Gain in Btu pbb (hb) (sq ft)
NE E
54 54 128 149 139 197 107 202 54 176 18 124 16 57 16 18
SE s
20 3
81 m
8 12
171 32
183 .72 174 110 143 136 86 144
SW
3 7 10 12 14 16 42 96
W NW Hobiz.
10 10 12 12 129 14 14 15 15 16 16 18 16 234
NW W SW S SE E Nir Hobiz.
other design temperatures are given in Table 24 in a later section, Effect of Deviation from Design Conditions.
Tables 16 and 17 may be used for other types of glass with good accuracy, by using the factors given in Table 18: Table 16 values are multiplied by the appropriate factor given in Table 18 to obtain heat gain due to trans mitted solar radiation. For glasses having a transmittance for normally incident radiation differing from the table values, factors may be found by linear interpolation. To obtain instantaneous rates of heat gain by con-
CooKng
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,, !Instantaneous Rates-of Heat Gain bt Convection and Radiation Tab^-.*Fbom Single Sheet'; of. Unshaded Common Window Glass
For Clear Atmospheres and 18 Deg Declination, North (August 1) For 15 F Indoor Temperature
Note' For total instantaneous heat gain, add these values to the Table 16 values.
on Time
Nobth
Dbt* Bulb Deo F
Lati
tude De
grees
Instantaneous Heat Gain in Btu pbb (hb) (bq ft)
-
N - NE
E
SE
S
SW W NW Hob. -
5 aJn> 7 9 10 ii 1 rr 2
*
7
9
9
2'
7 8 9
6 7 8. 9 10 11 12 1 pjn. 2 3 4 .5 6 7 8 9
80
30 94
93
87
85 83.
74 74 75 . 77 80
83 87 90 93 94
95 94 93 91 87
85 83
74 74 75 77 80
83 87 90 93 94
95 94 93 91 87
85 83
40 : 50
-1 -1 -1 -1 0 1
03 3 256 579
8 10 11 . 13 13 15 17 17 17 20 20 20 21 . 21 , 21
22 22 22 21 21 21 21 20 20 18 18 18 13 13 13
11 11 11 888
-1 0 0 2 5
8 13 17 20 21
22 21 20 18 .13
11 8
-1 1 3 5 7
9 13 17 20 `21
22 21 20 18 13
11 8
-1
3 6 9
11 15 . 17 20 21
22 21 20 18 13
11 8
-1 0 0 2 5
8' 13 17 20 21
22 21 20 18 13
11 8
0 1. 2 4 6
9 13 17 20 21
22 21 20 18 13
11 8
0 1 3 5 9
11 15 17 20 21
22 21 20 18 13
11 8
-1 0 2 5 8
11 15 18 20 21
22 21 20 ' 16 13
` 11 8
-1 0 2 5 8
11 16 18 21 21
22 2120 18 13
11 8
-I 2 5 9
12 16 19 21 21
22 21 20 18 13
11 8
-1 -1
0 2 6
9 14 18 21 22
23 21 20 18 13
11 8
-1
0 3 6
10 15 19 22 . 23
24 22 20 18 13
11 8v
-1 -1
0 3 7
11 16 19 23 24
24 22 20 18 13
11 8
-1. -1
0 2 5
8 13 18 22 24
25 24 22 19 13
11 .8
-1 -1
0 2 5
8 14 18 22 24
26 25 23 19 13
11 8
-1 --1 .0
2 5
8 14 19 23 25
26 25 23 19 13
11 8
-1 -1 -1
-1 -1 ` -1
002 225 55 9
8 8 13 13 13 18
17 17 21 22 21 25
24 23 26
26 25 25 24 24 23 19 19 13 13
11 11 88
26 24 22 18 13
'll.
8
-1 -1 -1 --1 0
002 225 .5 5 8 -
8 8 13 13 13 18 17 17 . 21 22 20 25 24 22 26
26 24 26
25 24 24 24 23 22 20 20 18
13 13 . 13
11 11 11
888
-1 -1 -1
-l --1
0
002
225
558
8 8 12 13 13 17
17 17 20 21 20 24 24 21 25
26 24 26
25 23 24 .. 24 23 22 20 20 18 14 14 13
11 11 11 888
vection and radiation, two steps are required. First, Table 17 values are multiplied by the appropriate coefficient of X listed in Table 18. Second, Table 19 values are multiplied by the appropriate coefficient of Y listed in Table 18, and added to the first value. All convection and radiation
gain values for double glass were computed for a $-in. air space. No great