Document aJ5KZB89Jqwv1ng2Ge8wZjo3M

294 CHAPTER 12 tv 1952 Guide Table 22. Description of Glass Block Patterns A- Ouidoor surface Elevation Section of Hollow Glove Block to Indicate Location of Surface Patterns Type I --Smooth Face Type IV--Light Diffusing A, D: Smooth . , A, D: Close pitch deep horizontal B: Wide vertical ribs or flutes corrugations C: Wide horizontal ribs or flutes B, C: Vertical light diffusing prisms E: None- E: None Type II A, D B, C --Semi-Light Diffusing Narrow vertical ribs or flutes Etched or stippled Type IVA--Light .Diffusing Same as IV except tions vertical corruga E None Type V -Light Directing A, D Close pitch deep vertical cor Type III--Light Diffusing rugations A, D Narrow vertical ribs or flutes B, C . Horizontal fight directing B, C Etched or stippled prisms E Glass fiber screen None Table 23. Instantaneous Rate of Heat Gain Due to Transmitted Direct and Diffuse Solar Radiation by. Unshaded Walls of 8-in. Hollow Glass Block of Type I Pattern For Clear Atmospheres and 18 Deg Declination, North (August 1) Note: For total instantaneous heat gain add these values to Table 24 values Sun Tims H ? AM-* J 4- Instantaneous Heat Gain in Btu peb (sb) (sq ft) N NE E SE s SW W NW a : Zo . . eo B z o m Q .0 z oH Q g 6 a.m. 7 8 9 10 11 12 5 a.m. 6 7 8 9 10 11 12 5 a.m. 0 7 8 9 10 11 . 13 6 p.m. 5 4 3' .. 2: 1 7 p.m. 6 5 4 3 2 1 7 p.m. 6 5 4 3 2 1 4 5 5 5 6' 8 6 1 5 4 5 5 6 6 6 4 .5 4 4 5 5 8 6 45 59 42 25 12 8 6 3 50 54 34 18 ,8 6 .6 28 ' 53 44 26 12 6 6 6 55 94 94 59 2712 7 3 67 98 90 59 29 13 6 27 77 101 88 57 29 14 6 12 2 29 4 38 5 34 6 24 9 13 10 89 00 17 2 36 4 47 5 47 10 35 15 22 18 13 17 41 22 3 44 4 57 7 60 16 54 25 34 32 20 34 22 33 44 55 66 7 6 87 00 22 44 44 5 5. 56 76 13 6 11 22 44 44 55 65 10 6 20 6 2 3 4 5 6 6 6 0 2 4 4 5 6 6 6 1 2 4 4 5 5 6 6 T PM-* N NW W sw- S 8E E NE. Cooling Load 295 Table1 24. Instantaneous RAtes of Heat.Gain by Convection and Radiation from Unshaded Walls of 8-in. Hollow Glass Bl'ock of Patterns Type I, II, III, IV, IVA and V* ' For Clear Atmospheres and 18 Deg Declination, North (August 1) For 75 F Indoor Temperature Note: For total instantaneous heat gain add these values to values in Table 21, or Table 2S adjusted by Table 25 factors. Sun Time Dbt- Bulb Fahb. 5 a.m. 6 7 8 9 10 11 12 1 p.m. 2 3 4 5 6 7 8 .9 74 74 75 77 80 83 87 90 93 94 95 94 93 91 87 85 83 40 Degrees North Latitude Instantaneous Heat Gain in Btu peb (hb)(bq ft) . N NE E SE - s : . SW w . NW. -1 -1 -1 -1 -l 2 5 6* 5 0 3 . 17 19* 15 i 2 23 28* 23 3 2 -22 35 29-. .. 7 -1 -1 0 -0 11 22 34 --1 0 1 2 3 j 4 14 38 34 14 . 5 5 5 6 8 31 34 21 '"7 8 `7 8 10 18 28 25 11 10 9 10 12 16 16 28 27 14 11 11 12 17 , 13 - 27 39 30 13 J3 13 18 13 23 . 46 43 19 13 13 17 13 18 47 46 32 13 12 15 12 15 45 44* 37 15 11 13 11 13 37 37* 31 13 9 10 9 . 10 21 23* 17 9 66 6 6 99 6 8 15 ' 4 5 4 5 6 5 Sun Time DryBulb Latitude SE S SW Latitude SE S SW 5 a.m. 6 9 10 12 1 pan. 3 5 .8 .74 . 74 75 77 80 83 87 90 93 94 95 9493 91* 87 85 83 30b Degrees North Latitude .; -1 3 13 22 28 31 28 20 12 13 14 14 13 12 8 6 5 -1 0 1 2 3 6 10 14 17 . 18 16 15 13 11 8 6 5 -1 u 0 1 .2 4 6 7 9 18 32 41 45 43 34 17 8 5 50b Degrees North Latitude -1 ; 7 15 23 29 34 37 . 35 25 14 13 13 12 11 9 6 5 -1 0 1 2 8 17 24 30 33 34 30 22 14 12 9 6 5 --1 0 1 2 3 4 6 19 33 41 45 46 45 38 25 . 12 5 . ,l\?r trP HI. IV, IVA and V patterns and 30, 40 and 60 deg latitudes, multiply east wall values for 6 t and 8 a.m. b-y 1.40, -a--n--d---w--e--s-t--w--a--l-l--v-a--l-u--e--s--f-o--r--5, 6- and 7 p.'in. by 11.25. . For N, NE, E, W and NW use 40 deg North Latitude values. and diffuse solar radiation, while Table 24 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 mn.Yimum dry-bulb temperature, as indicated in the table, and are basedupon 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 26 gives cor rections to be applied for other design temperatures., To obtain transmitted direct and diffuse solar radiation for other types oi 8-in. block, the Table 23 values are multiplied by the approximate per-