Document M3e2NG0pByekj7954kR4MOaj

18 318 CHAPTER 13 1957 Guide ` / ' Table 21. Instantaneous Rates of Heat Gain bt 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 Declination, North (August 1) For 80 F Indoor Temperature'' Note: For total instantaneous heat gain add these values to values in Table 18, or Table SO adjusted by Table 28 factors. Sun Time Bulb Fahr. 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) (sq *t) N NE --3 0 1 0 0 2 4 6 8 9 11 11 11 13 11 . 7 4 --3 '3 15 21 20 12 6 8 10 10 11 11 10 9 7 4 3 E --3 4* 17* 26* 33 36 29 16 14 15 16 15 13 11 8 4 2 SE S SW --3 3 13 21 27 32 32 26 14 11 11 11 10 9 7 4 3 --3 --3 --2 --2 --1 --1 10 51 12 3 19 5 23 9 26 25 25 37 21 ~ 16 13 11 8 44 45 43 35 19 47 23 W NW --3 . --2 --1 0. 2- 3 6 8 12 28 41 44 42* 35* 21* 7 4 --3 ~2 --1 0 1 3 5 7 9 11 17 30 35 29 15 4 3 Sun Tine DbtBulb Latitude SE- S SW Latitude . SE S , SW 5 a.in. 6 7 8 9 74 74 75 77 80 --3 1 11 20 26- --3 --2 --1 0 1 --3 --2 --1 0 2 --3 --3 5 --2 13 --1 21 0 27 6 ~3. --2 --1 0 1 10 11 12 .1 p.m. 2 3 4 5 6 7 8 0 83 87 90 93 94 95 94 93 91 87 85 83 30b Degrees North Latitude 29 4 4 26 8 5 18 12 7 50* 10 15 16 Degrees 11 16 30 North Latitude 12 14 .39 12 13 43 11 11 41 . 10 9 32 6 6 15 446 333 32 15 2 35 22 4 33 28 17 23 31 31 12 32 39 11 28 43 11 20 44 10 12 43 9 10 36 7 7 23 4 4 :io. 3 3 -3 _v -- * For types III, IV, IVA and V patterns and 30, 40 and 50 deg latitudes, multiply east wall values for 6 7 and 8 a.m. by 1.40, and west wall values for 5, 6 and 7 p.m. by 1.25. b For N, NE, E, Wand NW use 40deg North Latitude values. : determined 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 23 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 centages given in Table 22. Note that corrections are the same for all latitudes, and that they vary only on the surfaces exposed to the direct sun. The convection and radiation gain values for all blocks are so nearly?,. 'jt\ Cooling Load 319 Table 22. Instantaneous Rates of Heat Gain Dub to Transmitted Direct and Diffuse Solar Radiation bt Unshaded Walls of 8-in Hollow Glass Block of Types II, III, IV, IVA and V Patterns Multiply the Table 20 Values for Type I by These Percentage Factors For Clear Atmospheres and 18 Deg Declination, Norik (August 1) For SO, jjO, and SO Deg North Latitude Note: To obtain total instantaneous heat gain add adjusted Table 20 values to the Table 21 values. INSTANTANEOUS BEAT G AJN D0B TO TRANSMITTED SOLAR RADIATION AS A PERCENTAGE OF Tn*E ! PATTERN Sun Time AM -- i Ttpe II Pattern N, NW, W. SW NE E SE s 5 a.m. 6 7 8 9 10 11 12 7p.m. 6 100 100 6 100 4 100 3 2 100 100 1 100 100 100 100 100 100 95 95 90 100 90 90 90 100 95 90 90 100 95 85 90 90 95 95 95 95 100 95 95 100. 100 100 100 100 PM - N, NE, E, SE NW W SW s. Sun Time AM -- i Ttpe IV Pattern N, NW, W, SW NE E SE s 5a.m. I I9 10 II 7p.m, 6 5 34 s 55 55 55 55 55 55 55 55 45 35 75 45 35 80 45 35 60 45 30 40 60 25 30 65 35 30 55 45 35 55 55 50 p-. N, NE, E, SE NW W SW 55 55 55 55 60 50 40 45 s Sun Time AM- i Type V Pattern N NW, W. SW NE E SE s ? 10 J____ 7 pun. 6 i \ ? 60 35 35 30 60 60 60 60 60 35 35 30 60 35 40 35 60 50 65 50 60 80 90 90 60 60 60 70 105 105 90* 60 80 110 105* 60 60 60 85 115* Ttpe III Pattern N, NW, W, SW NE E SE S 70 70 70 70 70 70 70 70 N, NE, B, SE 70 70 70 65 65 70 65 60 65 65 60 65 65 65 70 70 70 75 70 70 80 70 70 75 NW w SW 70 70 70 70 65 65 75 90 S Type IVA Pattern . N. NW, W, SW NE E SE S 55 55 55 55 55 55 55 55 N. NE, E, SE 45 35 30 55 35 35 35 40 30 35 55 55 45 45 45 55 50 65 65 50 55 85 90 60 55 70 105 95 55 55 100 115 NW W SW S Designation of Block Type H--Semi-Light Diffusing HI--Light Diffusing IV--Light Diffusing IVA--Light Diffusing V--Light Directing _____________ pk- N, NE, B, SB NW W SW S "Reduce by 30% for 30 deg N latitude only. Table 23. Approximate Cobbections to Tables 14 and 21 fob Deviations fbom Indoor and Outdoor Design Temperatures For each degree the design room temperature exceeds 80 F, subtract correction.* For each degree the design outdoor dry-bulb temperature exceeds 95 F, add correction.b Apply these corrections to each value in Table 14 or Table L Glass Type Single Flat or Rolled Figured Glass uuble Flat Glass and Glass Block U wPe""tUre " less than 80F' "< correction, temperature ia less than 95F, subtract correction. Correction Btu per (hr) (sq rr) 1.0 0.5