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198 CHAPTER 13 1960 Guide Table 15... . Heat Absorbed in Glass. Values of Y to be Used with Factors in Table 14 and Table 16 in the Determination of Instantaneous Rates of Heat Gain Due to Convection and Radiation for Various Types of Single Glass and Combinations of Two Sheets of Glass Spaced at J^ln, for Clear Atmospheres and IB Dog DetSnaHon, North lAagatt IJ Vokw of Y in 6hr per (to) (aq ft}* 5 sjq. 7 9 10 12 1 p.m. 3 40 Degrees North N NE . e SC S SW W NW Hertz. 00l 00 000 4 16 18 9 1 1 l 1 2 24 30 20 2 2 2 2 2 22 33 25 2 2 2 2 2 16 30 29 8 3 3 3 32 3 5 25 27 14 3 3 3 3 3 12 21 18 3 3 3 3 3 3 15 19 12 3 3 3 3 3 3 19 22 10 3 3 3 3 3 16 27 24 4 41 3 3 3 3 10 30 31 15 35 3 3 3 3 4 29 36 23 26 2 2 2 2 2 23 34 27 17 4 1 1 1 l 14 24 21 6 000002 33 1 Sow Time latitude S 5 a.ra. 6 10 12 1 p.m. 3 5 30* Degrees North 0 7* 18 22 24 22 16 6 3 3 3 3 2 1 0 * Value* erf T lor 8 and 9 p.m. are aero. b For N, NE, E, W, NW,aad boriaoctal uae <0 dap North latitude value*. S 0 2 2 3 5 7 9 9 6 5 3 2 1 0 sw Sen Time 0 5 a.m. 16 27 28 39 3 10 3 11 4 12 14 1 p.m. 21 2 27 3 26 4 21 5 11 6 07 latitude 50* Degrees SE s sw 20 13 1 22 2 28 3 30 13 31 20 27 25 20 27 9 26 3 22 3 16 27 22 11 00 0 2 3 3 17 26 32 33 31 26 17 7 for 8-in. hollow glass block of Type I pattern. For gl*ma blocks of Types II to V the corresponding instantaneous heat gain is found by multiplying the value found for Type I Mock from Table 19 by the appropriate factor from Table 20. Hie instantaneous rate of heat gain due to convection and radiation for unshaded 8-in. hollow glass blocks of Types I to V are given in Table 21. The convection and radiation gain values for all blocks are so nearly the &mi> that a ringte table suffices. Note, however, that corrections must be made for certain hours for east and west facing walls of patterns. Tables 22 and 23 give instantaneous heat gain values for two types of glass block design for use in skylights. The Type VI block is 10>$ x 10H im and the Type VII block 12 x 12 in. It should be noted that the data for Type VT glass block in Tables 22 and 23 are for panels as assembled. Since the manner of mounting this type of block is standard the ratio of glass area to opaque area is virtually constant from one skylight to another. The Type VII glass block may be mounted on.a wide range of center-to-center distances. The opaque portion of the assembly should be given separate consideration independent of the ghma block. See Reference 24 for more complete information. These tables are based upon the solar intensity values for a clear atmosphere as given in Table 4. For solar energy transmittance data refer to References 21 and 24. The values of convection and radiation gain are based on values of 80 F for indoor air temperature, a maximum outdoor air temperature of 95 F and upon experimentally determined values of solar energy and temperature difference between the two faoes. Indoor and outdoor convection and radiation heat-transfer values are the same as those used for common window glass. Table 24 gives corrections to be applied for other design temperatures. Example 9: Find the total instantaneous heat gain through an east wall of 8-in. hollow glass block of Type V pattern at 8 am. and 50-deg north latitude. The design temperatures are 80 F indoors and 95 F maximum outdoor dry-bulb, with a clear atmosphere. Solution: The gain due to transmitted solar radiation is found from Table 19 for Type I pattern. The factor for Type V is found from Table 20. The convection and radiation gain is found from Table 21 (note the footnote). Cooling Load 199 Table 16..... Application Factors to Apply to Tobies 13 and 15 to Obtain Instantaneous Rates of Heat Gain for Vertical Single Sheets of Rolled figured Glass Having Normal Incidence Transmittance* and Listed Thicknesses (Smooth Side Indoor, figured Side Outdoor) (So* Table 17 tor Factors fo Appif to Table 12 Votiret) Gfots Pattern Normal todefence Traetmittanee lUdnao, Inch** Fortor to Apply to Table IS Hammered Hammered, etehed both sides Deep ribs on H in- centers Hammered heat absorbing Hammered heat absorbing, etched both sides * X value* we Table 11 value*. t> f value* are Table 11 value*. * Um 0.4Q( f) Cor east and west stem- 0.75 0.67 0.77 approx. 0.21 0.14 3*9 Ht lit Yk Ye * 0m 0.800') lor east and west daaa. * 0m 0.3SI T) tot cast and west sins. 1 Use C.9K f) lor south abas 1.0(X)* + 0.50(K)b I.0CX) +0.5(t,) LOW +0.50(r)* l.Otff) + 1.15(7)* l.DCX) + 1.40(F) iabte 17 .... instantaneous Rates of Heat Gain Due to Transmitted Direct and Diffuse Solar Radiation by Unshaded Rolled figured Gloss Multiply (be Table 12 Vabw by Thom Percentage Footer* For dear Afmotphere* and 18 Degree* Oedmatioa, North (August I) Fur 30, 40, and 50 Degree* North latitude Note: To obtain total ntstastoneow* heat gum add odjestod Table 12 *wfoe* to odtasted Table 13 value* birtnrrtoneoc* Hoot Goto Duo to Transmitted Sofar Radiafioa at a Percentage of Single Sheet of Common Window Gfea Sun Time AM-> 4 5 ajn, 6 7 8 -9 10 11 12 7 p.m. 6 5 4 3 2 1 Hammered N, NW w, sw 80 80 80 80 80 80 80 80 NE h 80 85 80 75 60 65 80 80 E 85 85 85 85 80 ... 75 60 80 SE 70 75 80 80 80 75 70 60 Hammered and Etched s N, NW NE E SE w, sw 80 60 80 60 80 60 75 60 60 60 65 60 85* 60 65* 60 65 75 55 65 75 50 60 70 55 55 65 55 50 55 55 55 50 55 60 50 50 60 60 50 S 60 60 60 60 50 50 50 50 Sun Time 5 a.m. 6 7 8 9 10 11 12 7 p.m. 6 5 4 3 2 1 T PM--* ftib* an Yt la Cantor* Hammered Heal Absorbing 60 75 85 25 60 25 20 25 20 25 60 80 85 30 60 25 20 25 20 25 60 65 85 40 60 25 20 25 20 25 60 40 80 50 55 25 20 20 20 25 60 30 70 55 35 25 20 20 20 20 60 40 40 55 35 25 20 20 20 20 60 60 35 40 35" 25 25 20 20 20 60 60 60 35 45* 25 25 25 20 20 N, NE E.SE NW w SW S N, NE E, SE NW W SW S Sun Time AM-* l 5 ajn. 6 7 8 9 10 11 12 7 pjm. 6 5 4 3 2 1 T PM --* Hammered aad Etched Heat Absorbing N, MW N SE S W, SW 20 15 15 10 20 20 15 15 IQ 20 20 10 15 10 20 20 10 15 10 20 20 10 10 10 10 20 15 10 10 10 20 20 10 10 10 20 20 20 10 10 N, NE E.SE NW w sw S * Decrcue valuta 19 percent lor JO des latitude; iaerceae It percent (or BO deg latitude. b Increase values 30 percent (or 60 dec latitude.