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188 CHAPTER 13 1959 Guide Table 15.... Heat Absorbed in'Glass. Values of Y to be Used with Factors, m Table 14'and Table 16 in the. - Determination of Instantaneous Rates of Heat Gain Due to Convection and Radiation for Various Types of Single Giass and Combinations of Two Sheets of Giass Spaced at y in. For Cfear Ahnuphtm and 16 D*g DceEaoKoa, Nwtt (Avgo*t I) Sun Tam latitude toVatoe* of Y Bfe per (far) (*q ft] N Nf E SC s SW W NW Horiz. 5 a.m. 0: 7 8 9 10 11 12 1 p.m. 2 3 4 5 6 7 40 Degrees North 0 0 1 0. 0 0 0 4 16 18 9- 1 1 1 2 24 30 20 2 2 2 162 22 33 25 2 2 2 2 30 29 8 3 3 3 5 25 27 14 3 3 3 3 12 21 18 3 3 3 3 3 15 19 12 3 3 3 3 3 19 22 10 3 3 3 3 16 27 24 00 13 2 11 2 21 3 32 3 37 3 42 3 45 3 44 4 41 3 3 3 3 10 30 31 15 35 3333 4 29 36 23 26 2 2 2 2 2 23 34 27 17 41 1 1 1 14 24 21 6 10 0 0 0 0 2 3 3 Son Time Latitude SC s SW Sun Time Latitude SE S SW 5 a.m. 6 7 8 9 0 7 IS 22 24 10 11 . , 12 1 p.m. - 30* . Degrees North 22 16 6 3 3 33 -4 3 52 61 70 * Values of Y for 8 and 9 p.m. ere aero.. b Far N, NE, E, W, NW,and barieontal uetOdet North Latitude values. 0 1 2 2 3' 5 7 9 9 6 5 3 2 1 0 0 5 a.m. 16 27 28 39 3 10 3 11 50* 4 12 Degrees 14 1 p.m. North 21 2 27 3 26 4 21 5 11 6. 07 2 13 22 28 30 31 27 20 9 3- 3. 2 2 1 0 0 1 2 3 13 20 25 27 25 22 16 7 -2 1 0 0 1 2 2 3 3 5 17 26 32 33 31 26 17 7 tion properties, no attempt has been made to give values for nonvertical glass. Design Tables for Glass Block Walls . Table 18 describes the. glass block patterns discussed in following text. Table 19 gives design values for instantaneous heat g*.in due to transmitted direct and diffuse solar radiation for 8-in. hollow glass block of Type I pattern. For glass blocks of Types IT to V the corresponding instantaneous heat gain is found by multiplying the value found for Type I block from Table 19 by the appropriate factor from Table 20. The instantaneous rate of heat gain due to convection and radiation for unshaded 8-in., hollow glass blocks of Types 1 to, V are given in Table 21. The convection and radiation gain values for all blocks are so nearly the same that a single table suffices. Note, however, that corrections must be made for certain hours for east, and west facing walls of some 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 10X * 10^ in. and the Type VII block 12x12 in. -It should be noted that the data for Type VI 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 glft-g* 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 glass 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.faces. Indoor and outdoor convection and radiation heat-transfer values are the same as those used for common Cooling Load 189 Table 16 .... Application Factors to Apply to Tables 13 and 15 to Obtain Instantaneous Rates of Heat Gain for Vertical Single Sheets of Rolled Figured Glass Having Normal Incidence Transmittances and Listed Thicknesses (Smooth Side Indoor, Figured Side Outdoor) (Sm Table 17 for Factor* to Apply to Tefal* 12 Vetoes) Glam Pattern Normal hadeoca Trnnmittluuce rWdtnen, toebo* Factor to Apply to Table 13 Hammered Hammered, etched both sides Deep ribs on X in. centers Hammered heat absorbing Hammered heat absorbing, etched both sides * X value* ere Table 13 valoee. b T valoee are Table IS value*. U*e 0.40(F) for eaat and west paas. 0.75 0.67 0.77 approx. 0.21 0.14 Ml Ms X X 4 U &60(7) lor eaat and west clam. * Cae UHT) tat eaat and west f1-- * Uee 0.99(F) for aouth gtoaa. l.OGD* + 0.50(F)b* 1.0(X) +0.65(K)d 1.0(X) + 0.50(F)* 1.0(JT) + 1.16(F)* l.OCT) + 1.40(T) Table 17 .... Instantaneous Rates of Heat Gain Due to Transmitted Direct and Diffuse Solar Radiation by Unshaded Rolled Rgured Glass Multiply (he Table 12 Vatoe* by The** Percentage factor* For dear Atmotplw* and 18 Degree* DedtoaBon, North (Augud I) For 30, 40, and SO Degree* North latitude Note; To obtain total tostaafaneea* heat gain add od/uded Table 12 value* to odpnfed Table 13 vatoe* tndenfaneovt Hoot Gain Due to Transmitted Solar ftodSafioa a* a Percentage of Singfo Sheet of Common Window Gfo** Sob Time AM --* l 5 ajn. .7 p.m. 66 75 8- 4 93 10 2 11 1 12 N, NW W, SW 80 80 80 80 80 80 80 80 ' Hammered NE E SE 80 85 8075 60. 65 80 80 85 70 85 75 85 80 85 80 80 80 75 75 60 70 80 -- 60 Hammered and Etched s N, NW NE E SE W, SW so 60 80 60 80 60 75 60 60 60 65 60 65 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 Suo Tim* 5 a.m. 6 7 8 9 10 11 12 7 p.m. 6 5 4 3. 2 1 T PM--* gib* ae > to. Centers Hammered Heat Absorbing 60 60 60 . 60 60 60 ^ 60 60 N, NE t,SE 75 85 25 60 80 85 30 60 65 85 40 60 40 80 50 55 30 70 65 35 40 40 65 35 60 35 40 35b 60 60 35 45b NW W SW $ 25 25 25 . 25 25 25 25 25 N. NE E, SE . 20 25 20 25 20 25 20 20 20 20 20 .20 25 20 25 25 NW- W 20 25 20 25 20 25 20 25 20 20 20 20 20 20 . 20 20 SW S Sun Time AM-* 1 5 aun. 6 7 8 9 10 11 12 7 p.m. 6 5 4 3 2 1 T PM --* f Hammered and Etcfaed Heat Abeorfatog N, NW W, SW NE E SE S 20 15 15 10 20 20 15 15 10 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 * Decrease valoea 10 percent for SO dec latitude: incease 16 percent far 60 del latitude. b Increase value* SO percent for 60 dec latitude.