Document 4L4oBvbbm6XmLJ910E4ozb7Q

292 CHAPTER 13 1954. Guide Table 15. Application Factors to Apply to Tables 13, 14 and,16 to.Obtain Instantaneous Rates op Heat Gain fob VariousTypes op. Single Flat Glass and CombinaAons oe Two Sheets cir Flat Glass Spaced at i in." ' ' Glass* Single Common Window Single RegularPlate Single Heat Absorbing Piste Double Common Window Outdoors) . Normal Incidence Transmittance -Factor to Apply to ' Tablb 13 0.87 0.77 0.41 0.76 0.60 0.35 1.00 0.87. 0.46b 0.85 0.66b 0.37* Factor to Apple to Table 14 i.o(Y)" + o.o(yjd 1.0(10 + 0.25(7) 0.6(X) +0.10(7) 0.(X) +0.65(7) 0.6(X) + 0.75(7) * Common window glass } in. thiofe. Plate glass i in. thick. .b For better precision, increase (actors 10 percent when glass is in the shade, o v .1mm r Table 14 values. " F values are Table 26 values. Table 16. Heat Absobbed in Glass. Values of Y to be Used with Factors in Table 15 and Table 17 in the Determination of Instantaneous Rates of Heat Gain Due to Confection and Radiation fob Vabious Types of Single Glass and Combinations of Two Sheets of Glass Spaced at J in. For Clear Atmospheres and 18 Deg Declinationt North (August 1) Sun Time 5 a.m. 6 7 8 9 10 U 12 1 p.m. 2 3 4 5 6 7 40 Degrees North Latitude Sun Time] ' Latitude 6 a.m. 0 7 10 11 12 1 p.m. 30 Degrees North Latitude NE 0 16 24 22 16 5 3 3 SE 0 7 18 22 24 16 .6 3 3 3 3 2 1 0 Values of Y in Btu per (hr) (6Q pr)* SE 1 18 30 20 25 25 27 12 21 3 15 33 33 3> 3 2 1 0 sw 2 2 8 14 18 19 19 16 10 4 29 2 23 1 14 02 SunTime 5 a.m. 10 11 4 12 .14 1 p.i 21 2 `27 3 26 4 21 5 11 6 07 50b Degrees North Latitude NW 0 1 2 2 3 3 3 33 10 3 24 4 15. 23 34 27 24 21 33 SE 20 13 1 22 2 28 3 30 13 31 20 27 25 20 27 9 25 3 22 16 7 2 1 0 0 3 II 21 32 37 ' 42 45 44 41 35 26 17 6 1 sw 5 17 26 32 33 31 26 17 7 b Values For (j, of Y for 8 NE, E, W, and NW 9 pm. are aero, and horiaontal use 40 deg North Latitude values. Cooling Load 293 Table 17. Application Factors to Apply to Tables 14 and 16 to Obtain In stantaneous Rates op Heat Gain for Vertical Single Sheets op Rolled Figured Glass Having Normal Incidence Tbansmittances and Listed Thicknesses (Smooth Side Indoors, Figured Side Outdoors) (See Table 18 for Factors to Apply to Table IS Values) Glass Pattern Normal Incidence Transmittance Thickness, Inches Factor to Apply to Table 14 Hammered Hammered, etched both sides Deep ribs on f in. centers Hammered heat absorbing Hammered heat absorbing, etched both sides 0.75 0.67 0.77 approx. 0.21 0.14 Hi I.0(X)* + 0.50(7)b- Va 1.0CX) + 0.65(7)d V& i.o(X) + o.wm* H 1.01), + 1.15(7)' Ya i:o x + 1.40(F) . " X values are Table 14 values b Y values are Table 18 values . . c Use 0)40(7) for east and west glass d Use 0.60( Y) for east and west glass Use 0.35( Y) for east and west glass 1 Use 0.95(7) for south glass Table 18. Instantaneous Rates of Heat Gain Due to Transmitted Direct and Diffuse Solar Radiation by Unshaded Rolled Figured Glass Multiply the fable IS Values by These Percentage Factors For Clear Atmospheres and 18 Degrees Declination, North (August 1) For SO; 40, and SO Degrees North Latitude Note: To obtain-tolal instantaneous heal gain add adjusted Table 13 values to adjusted Table H values Instantaneous Heat Gain Due to Transmitted Solar Radiation as a Percentage of Single Sheet of Common Window Glass Sun Time Hammered Hammered and Etched AM. 4- ' N, NW w, SW NE E SE s.. N, NW w, SW NE E SE . S 5 a.m. 6 7 8 9 10 11 12 7 p.m. 6 5 4 3 2 t 80 80 85 70 80 60 65 75 55 60 ' 80 85 85 75 80 60 65 75 50 60 80 80 85 80 80 60 60 70 65 60 80 75 85 80 75 60 55 65 65 60 80 60 80 so 60 60 50 55 55 50 80 65 75 75 65 60 55 50 55 50 80 80 60 70 65* 60 60 50 50 50 80 80 80 60 65* 60 60 60 50 50 Sun Time 5 a.m. 9 11 7 p.m. 6 5 4 3 2 1 Ribs on ( In. Centers 60 75 85 25 60 60 SO 85 30 60 60 65 85 40 60 60 40 80 50 55 60 30 70 55 35 60 40 40 55 35, 60 60 35 40 35b 60 60 60 35 45b Hammered Heat Absorbing 25 20 25 20 25 25 20 25 20 25 25 20 25 20 25 25 20 20 20 25 25 20 20 20 20 25 20 20 20 20 25 25 20 20 20 25 25 25 20 20 :------- t PM- AM v i 5 a.m. 10 11 ___ 12 7 p.m. 6 5 4 3 2 1 T --____ _ PM-> N, NE NW W SW E, SE S N. NE NW W SW S E, SE Hammered and Etched Heat Absorbing N, NW W, SW 20 20 20 20 20 20 20 20 N. NE E, SE NE E SE S 15 15 10 20 15 15 10 20 10 15 10 20 10 15 10 20 10 10 10 10 15 10 10 10 20 10 10 10 20 20 10 10 NW w sw S * Decrease values 10 percent for 30 deg latitude; increase 15 percent for 50 deg latitude "Increase values 3C percent for 50 deg latitude