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CHAPTER 12
1951" Guide
Table 21V..Instantaneous Rates of Heat Gain by Convection and Radiation from Unshaded Walls of 8-in. Hollow Glass Block of Patterns Type I. II, III, IV, IVA AND V*
For Clear Atmospheres'and 18 Deg Declinationt North (August lj
For 75 F Indoor Temperature
Note: For total instantaneous heat gain add these values to values in Table 0, or Table 0 adjusted by Table 8 factors.
Sun Time
Dby-
Buiis Dbg F
Nobth Lati tude
De. ghees
N
Instantaneous Heat Gain in Btu peb (hb) (sq ft)
NE
E
SE-
8
8W
W NW
5 ajn. 6 7 8 9
74 :
74 75 77 80
-1 -1 -1
-1 -1 -1 -1
3 2 2* 3 0 0 0
5 17 17* 13 1 1
6 25 29* 22
2
22
4 26 37
28 3
43
-1 0 1 2 3
10 11 12
1 pjo. 2
83 87 90 93 94
30
6 20 39 8 14 31 10 10 16 12 11 15 13 12 17
31 28 20 12 13 .
6 10 14 17 18
6 7 9 18 . 32
5 7 10 . 12 31
6 7 9 10 14
3 95 4 94 5 93 6 91 7 87
13 13 18
13 13 17
17 12 15
16 11 13
12
8'
9
14 16 41 44
27
14 15 45 48
39
13 13 43 45* 40
12 11 34 36* 31
8 8 17 14* 14
8 85 9 83
6 65 5 54
66
87
5 5 55
6 5
5 aon. 6 7 8 9
74 74 75 77 80
-1 -1 -1
_1
-1 -1
-1
2
5 6*
5
0
00
3
17 19*
15
1
11
2 23 28* 23
3
22
2
22 35
29 7
34
-1 0 1 2 3
10 ' 11 12
1 PJD. 2`
83' 87 90 93 94
40
4 6 8 10 11 -
14
8 10 12 12
38 31 18 16 17
34 14
56
34 21
78
28 25
11 10
16 28 27 14
13 27 39 so
5 7 9 11 13
3 - 95 4 94 5 93 6 91 7 87
13 13 18 13 13 17 13 12 15 15 11 13 13 9 10
13 23
46 43
19
13
18
47;
46
32
12
15 . 45 *
44*
37
11 13 37 37* 31
9
10
21
23* .
17
8 85 9 J 53 .
9 66 6 54
6 6 99 5 4. 5 6
6 5
5 a on. 67 8. 9
. 74 '74 75 .77 80
-1 _1
-1 -1
-1 -1
5
9 10*
7'
0
0'
0
. 3 18 21* 15
1
11
2
22 .
29*
, 23
3 17 35 N 29
2. 2 2 8 33
-1 0 1 2 3
10 11 12
1 pan. 2
83 87 90 93 94
5 7 .9 50 11 13
8 38
7 33
34 37
9 19
35
11 15 25
12 17
14
17 24 30 33 34
45 67 19 9 33 13 41 33
5 7 9 11 12
3 4. -5 6 7
95 94 93 91 87
13 13 18 13 13 17 12 12 16 13 11 14 14 9 9
13 30 45 43
14
13 22 46 46
26
12 14 45' 44* 34
11 12 38 38* 31
9 9 25 s 26* 21
8 .9
85 83
7 66 5 55
6
6
12
12 *
8
5
5. 5
5
5
* For types m, IV, IVA and V patterns and 30, 40 and 50 deg latitudes, multiply east wall values for 6, ' 7 and 8 aJn. by l .40, and west wall values for 5,0 and 7 p.m.by 1-25.
'Cbpiing;t9ad
295
__ _ window glass for the same hour, orientation and latitude. The co
lor common
e |g is 0 25j while the / value is found from Table 19 for a south-
efficientoi.rand 4Q deg nortfc latitude. The correction for design dry-bulb west waliai v d from Table 24 to be 1.0 Btu per (hr) (sq ft) per degree difference
95 F design temperature. The total instantaneous heat gain 18, from Equa-
tion 7a,
,, g7 x 148 4. 1.0 x 24 + 0.25 X 27 + 1.0 (98 - 95) = 162.7 Btu per (hr)(sq ft)
Design Tables for Glass Block Walls
Tables 20 and 21 give design values of instantaneous rates of heat gain for sunlit walls of Type I pattern 8-in. hollow glass block for a solar de clination of 18 deg (see Table 22 for description of block patterns). These tables are based upon the solar intensity values for a clear atmosphere as eiven in Table 5. For solar energy transmittance data the reader is referred to reference 18. Table 20 presents values of transmitted direct
Table 22--Description op Glass Block Patterns .
A-Outdoor surface
0-lndoor surface
E-Cavity partition
Elevation Section of BoUoto Glass Bloch to Indicate Location of Surface Pattern*
Type I --Smooth Face A, D: Smooth B: Wide vertical ribs or flutes C: Wide horizontal ribs or-flutes E: None
Type IV--Light Diffusing A, D: Close pitch deep horizontal corrugations B, C: Vertical light diffusing prisms E: None
Type II --Semi-Light Diffusing
A, D: Narrow vertical ribs or flutes
B, C: Etched or stippled
E: None
v-
Type III--Light Diffusing A, D: Narrow vertical ribs or flutes B, C: Etched or Btippled E: Glass fiber screen
Type IVA--Light Diffusing
Same as IV except corruga
tions vertical
Type V --Light Directing
A, D: Close pitch deep vertical cor
rugations
B, C: Horizontal light directing
prisms
E: _ None
and diffuse solar radiation, while Table 21 gives values of instantaneous rates of heat gain by convection and radiation from the wall. The latter values are for an indoor temperature of 75 F and a 95 F maximum dry-bulb temperature, as indicated in the table, and are based upon experimentallydetermined values of solar energy absorption and temperature difference between the two faces. Because the exact dependence of the latter on weather conditions has not been determined, the values of convection and radiation gain cannot be regarded as exact for the assumed design con ditions. Indoor and outdoor convection and radiation heat transfer data are the same as those used for common window glass. Table 24 gives cor rections to be applied for other design temperatures.
. To obtain transmitted direct and diffuse solar radiation for other types of 8-in. block, the Table 20 values are multiplied by the approximate per-
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