Document jmg46EMkndrZKOYVDnOEjYQxy

176 CHAPTER 9 1957 Guide Table 3. Conductances (C) fob Surfaces and Air Spaces All conductance values expressed in Btu -per (hr) (sq ft) (F deg temp aiff) Section A. Surface Conductances for Still Air* SuttrAtjE Eh:: Position op Surface Direction of Heat Flow Non-Reflective ' 0.90 Reflective 0.20 Reflective ` 0.05 R Horizontal:.......... Sloping--45 deg. Vertical............... .Sloping--45 deg.. Horizontal.......... Upward Upward Horizontal Downward Downward 1.63 1.60 1.46 1.32 1.08 0.61 0.62 0.68 0.76 0.92 0.91 0.88 0.74 0 60 0.37 1.10 1.14 1.35 1.67 2*. 70 0.76 0.73 0.59 0.45 0.22 1.32 1.37 1.70 2.22 4.55 Position of Air Space Horiz. 45 Slope Vert. 45 Slope Horiz. Heat Flow Up Up Horiz. Down Down* Air Space Thick ness Inches Mean Temp f $4 to 4 $4 to 4 $4 to 4 $4 to 4 % 154 4 $4 154 4 50 50 90 50 50 90 60 50 90 50 50 90 50 50 50 . 90 90 90 Temp Diff deg 10 30 10 10 30 10 10 30 10 10 30 10 20 20 20 20 20 20 Thermal CONDUCTANCE-C Thermal Resistance-B Value of E"'d 0.05 0.2 0.5 0.82 Value of B*1 0.05 0.2 0.5 0.82 0.41 0.54 0.41 0.55 0.82 0.68 0.95 0.58 0.92 1.11 1.24 1.28 2.44 1.84 2.47 1.83 1.47 1.73 1.22 1.05 1.09 0.90 0.80 0.78 0.35 0.49 0.48 0.62 0.35 0.52 0.76 0.89 0.86 1.05 1.18 1.23 2.84 2.08 2.85 2.05 1.62 1.92 1.31 1.13 1.16 0.95 0.85 0.81 0.28 0.38 0.29 0.42 0.52 C.46 0.69 0.79 0.80 0.99 1.08 1.16 3.52 2.64 3.49 2.37 1.94 2.19 1.44 1.27 1.25 1.02 0.92 0.86 0.24 0.30 0.25 0.38 0.43 0.42 0.65 0.71 0.76 0.94 1.00 1.12 4.14 3.36 4.07 2.65 2.30 2.40 1.54 1.41 1.32 1.06 1.00 0.89 0.28 0.18 0.11 0.42 0.69 0.31 0.58 0.25 0.52 0.98 0.87 0.81 3.57 5.56 8.94 2.38 3.23 4.03 1.45 1.73 1.92 1.02 1.15 1.23 0.31 0.20 0.13 0.48 0.37 0.30 0.82 0.71 0.64 1.18 1.07 1.01 3.23 5.00 7.82 2.08 2.70 3.35 1.22 1.41 1.56 0.85 0.93 0.99 : * Spaces of uniform thickness, bounded by moderately smuovu b Where a range of thickness is given, the given conductance is the average over the range; extreme ' Ivnatleurepsowlaittihoinn, tahnedrmanogdeerdaitfefeerxtthraepreoflraotmionb, yoflecsosntdhuacntan10cepvearclueenst.are permissible for other values of mean temperature, temperature difference and effective emissivity E. d Effective emissivity of space, E, is given by=1 r*--1 + --i --1 where ei and e* are the ernissivities E ei ( Tohf ethceosnudrufacctaenscoefsthoef haoirriszpoanctea.l sp(SaceeesSwecitthionheCa,t bfloewlowd)o. wnward are substantially independent of * BasetdemonpeNraattiuorneadliBffeurreenacueo. f Standard$ data presented in Housing Research Paper No. 32, Housing and Home Finance Agency, 1954 (U. S. Government Printing Office, Washington, D. C.) Section C Reflectivity and Emissivity Values of Various Surfaces* and Effective Emissivtties of Air Spaces Effective Emibsivitt B of Air space ; Reflectivity in PERCENT Average Emissivity iWith one sur With both face having surfaces of emissivity emissivity * and other 0.90! Aluminum foil, bright.................... . Aluminum sheet.................... ...... Aluminum coated paper, polished Steel, galvanised, bright................ Aluminum paint...................................... Building materials: wood, paper, glass masonry, non-metaflic paints............ . 92 to 97 80 to 95 75 to 84 70 to 80 30 to 70 5 to 15 0.05 0.12 0.20 0.25 0.50 0.90 0.05 0.12 0.20 0.24 0.47 0.82 0.03 0.06 0.11 0.15 0.35 0.82 * See also Chapter 5, Table 3. Heat Transmission Coefficients of Building Materials 177 Table 4. Conductivities (fc), Conductances (C) and Resistances (R) of Building and Insulating Materials (Design Values)* These constants are expressed in Btu per (hour) {squarefoot) {Fahrenheit degree temperature difference). Conductivities (*) are per inch thickness and, conductances (C) are for thickness or construction stated, not per inch thickness. Conductivity or Conductance Resistance (R) Material Description Density (Lb. per Cu Ft) (k) !* 2-* ;3i {C) CL AIR SPACES1* AIR SURFACES* Still Air 15 mph Wind 754 mph Wind building BOARD11 Boards, Panels, Sheathing. Etc. building .paper FLOORING MATERIALS See Table 1--Section B. Position Heat Flow Thickness Horizontal....... Up (Winter)........................$4-4 in. Horizontal........Up (Summer).....................$4-4 in. Horizontal....... Down(Winter).......................$4 in. Horizontal....... Down (Winter)..........................154in. Horizontal........Down (Winter)............................. 4in. Horizontal........Down (Winter).............................8in. Horizontal........Down (Summer)........................ $4in. Horizontal........ Down (Summer)..................... 1$4in. Horizontal........Down (Summer)............. 4 in. Sloping, 45...... Up (Winter).:.....................$4-4 in. Sloping, 45...... Down (Summer).............. $4-4 in. Vertical............. Horiz. (Winter)....................... $4-4in. Vertical............. Horiz. (Summer)..............$4-4 in. See Table 1--Section A Position Horizontal........... Heat Flow tt_ up sloping ns-) ........... Vertical. HomonpS Sloping (45").................................................. Down Horizontal..................................... Down Any Position--Any Direction (For Winter) Any Position--Any Direction (For Summer)'!! Asbestoa-cement board............................................. Asbestos-cement board......................................... Hin. Gypsum or plaster board....................................$4in. Gypsum or plaster board............... 54 in. Plywood..................... ......................................... ; - Plywood....... .................................................. 54 in. Plywood.................................................................. $6in. Plywood.................................................................. 54in. Plywood or Wood Panels.................................... $4in. Wood fiber board, laminated or homogeneous.. j Wood fiber--hardboard type............ ...................... Wood fiber--hardboard type....................... H in. Wood--fir or pine sheathing............................s$4ain. Wood--fir or pine......................................... l$4in* 120 50 50 34 34 34 34 26 31 65 65 Vapor--permeable felt.................... Vapor--seal, 2 layers of mopped 351b felt Vapor--seal, plastic film........ Asphalt tile...................................................... Carpet and fibrous pad.......................... C__n__rwnoutu. a* UnLdILSnT51ik|Rtu5U. ........J...............................".............................................-....... Ceramic tile............................................................. 1in. Cork tile.................................... ................................. Cork tile............................................................... 54in. Felt, flooring........................................................ . Floor tile or linoleum--av. value...................... 54in. Linoleum......................................................54in. Plywood subfloor........................................... $4 in. Rubber or plastic tile...........................................54in. Terrazzo.................................................................... 1in. Wood subfloor......... ................................. a$4* in. Wood, hardwood finish........................................$4in. 120 25 110 Blanket Batt Cotton fiber*............................................................... Mineral wool, fibrous form, processed from rock, slag, or glass*....................................................... Wood fibere........................................................... Wood fiber, multilayer, stitched expanding*....... 0.8-2.0 1.5-4.0 3.2-3.6 1.5-2.0 (1)1 1.18 1.28 0.98 0.87 0.81 0.80 1.18 1.07 1.01 1.11 1.12 1.03 1.16 0.85 0.78 1.02 1.23 1.25 0.85 0.93 0.99 0.90 0.89 0.97 0.86 4.0 0.80 0.42 0.50 1.40 1.63 1.32 1.08 6.00 4.00 0.61 0.62 0.68 0.76 0.92 0.17 0.25 33. 3.10 2.25 3.20 2.12 1.60 1.07 0.25 1.25 0.03 0.32 0.45 0.31 0.47 0.63 0.94 5.60 1.02 0.49 2.00 0.72 0.18 0.98 2.03 16.70 8.35 0.06 0.12 Negl 0.45 0.26 24.80 0.48 0.81 12.50 3.60 16.70 20.00 12.00 1.28 42.40 12.50 1.02 1.47 2.22 0.04 0.28 0.06 0.05 0.08 0.78 0.02 0.08 0.98 0.68 0.27 0.25 0.27 3.70 4.00 3.70