Document ExB32OEVRXKJaegd9qjMK7keg

172 CHAPTER 9 1950 Guide (C)Tablb 1. Conductances for Surfaces and Air Spaces AH conductance values expressed t'n Btu per {hour) (sguare foot) {Fahrenheit degree temperature difference). Section K. Surface Conductances for Still Alr Surface Emissivity op Surface op Heat Flow e 0.83 e - 0.05 Vertical'.................................... .................-- Upward Downward 1.95 1.21 1.52* 1.16 0.44 Section B. Conductance of Vertical Spaces at Various Mean Temperatures^ Mean Temp Fahr Dec 20 30 40 50 60 70 80 90 100 110 120 130 140 150 Conductances of Air Spaces for Various Widths in Inche 0.128 2.300 2.3S5 2.470 2.560 2.650 2.730 2.819 2.908 2.990 3.078 3.167 3.250 3.340 3.425 0.250 1.370 1.425 1.480 1.535 1.590 1.648 1.702 1.757 1.813 1.870 1.928 1.980 2.035 2.090 0.364 1.180 1.234 1.288 1.340 1.390 1.440 1.492 1.547 1.600 1.650 1.700 1.750 1.800 1.852 0.493 1.100 1.148 1.193 1.242 1.295 1.340 1.390 1.433 1.4S6 1.534 1.580 1.630 1.680 1.728 0.713 1.040 1.080 1.125 1.168 1.210 1.250 1.295 1.340 1.380 1.425 1.467 1.510 1.550 1.592 1.00 1.030 1.070 1.112 1.152 1.195 1.240 1.280 1.320 1.362 1.402 1.445 1.485 1.530 1.569 1.500 1.022 1.065 1.105 1.149 1.188 1.228 1.270 1.310 1.350 1.392 1.435 1.475 1.519 1.559 Section G. Conductance and Resistances of Air Spaces Faced on One Surface with Reflective Insulationo Location and Position op Air Space Direction of Heat Flow Temp* Diff Fahr Deg Winter Summer Conductance* (O No. of Air Spaces 123 Resistance* (r) No. of Air Spaces 1 23 Rafter Space (8 in.) , Horizontal Horizontal Horizontal Horizontal 30 deg slope 30 deg slope 30 deg slope 30 deg slope Down Up Down Up Down Up Down Up 45 45 45 45 25 25 25 25 0.10 0.27 0.09 0.24 0.15 0.25 0.13 0.23 0.07 0.17 0.06 0.16 0.10 0.17 0.09 0.14 10.00 3.70 11.11 4.17 667 4.00 7.69 4.35 14.29 5.88 16.67 C.25 10.00 5.88 11.11 7.14 Stud Space (3H n.) Vertical^ Vertical Vertical/ Vertical Vertical* 30 40 0.34 0.23 0.13 2.94 4.35 '7.69 15 20 0.32 0.18 0.11 3.13 5.56 9.09 30 | 0.46 2.17 Radiation and Convection from Surfaces in Various Positions, by G. B. Wilkes and C. M. F. Peterson {A.S.H.V.E. Transactions, Vol. 44, 1938, p. 613). * A.S.H.V.E. Research Report No. 825--Thermal Resistance of Air Spaces, by F. B. Rowley and A. B. Algren (A.S.H.V.E. Transactions, Vol. 35, 1929; p. 165). c Thermal Test Coefficients of Aluminum Insulation for Buildings, by G. B. Wilkes, F. G. Hechler and E. R. Queer (AJ3.H.V.E. Transactions, Vol. 46,1940). ^ Temperature difference is based on total space between plaster base and sheathing, flooring or rooffng. * These air space conductance and resistance values are based on one reflective surface (aluminum) hav ing an emissivity of 0.05 facing each space and are based on total space between plaster base and sheathing, flooring or roofing. The rafter and stud spaces are divided into equal spaces. t Stud space is lined on plaster base side with loose paper with aluminum on surface facing air space. The resistance of the small air space between the plaster base and paper was 0.43. 9 Radiation and Convection Across Air Spaces in Frame Construction, by G. B. Wilkes and C. M. F. Peterson (A.S.H.V.E. Transactions, Vol. 43, 1937, p. 351). * The recommended surface conductance for calculating beat losses for still air for non-refiective surfaces is 1.65 Btu. For a 15 mph wind velocity, the recommended value is 6.0 Btu. These coefficients were de rived from Fig. 3 which was based on tests conducted at the University of Minnesota, and apply to vertical Heat Transmission Coefficients of Building Materials 173 Table 2, Conductivities (A) and Conductances (C) of Building and Insulating Materials These constants are expressed in Btu per {hour) (square foot) (Fahrenheit degree temperature difference). Conductivities (A) are per tnch thickness and conductances (C) are for thickness or construction stated, not per inch thickness. Material Description Densiti (Lb per Cu Ft) Mela f Temp (Fahr Deg) CONDOcnvnr Os CoitDU stance tt) to RsaiSTANCE TPheicr kInnceha. For Thicknea Listed (1) (*) 1 i < BUILDING BOARDS Compressed cement and asbestos (Non-Insulating)------------- Corticated asbestos beard Pressed asbestos mill hoard ,, Gypsum board--gypsum between layers 123 20.4 60.5 86 110 86 2.70 0.48 034 037 2.08 1.19 of heavy paper......... ............................ H in. gypsum board............... ............... M in. gypsum board........ ........... ........... ia. gypsum board........ ...... _.... ..... 623 535 70. 90 1.41 0.71 73 2.82 2.60 (i> > in (n037 0.35 0.38 (1> FRAME CONSTRUCTION 1 in. Gr sheathing and building paper........ COMBINATIONS........ ..... 1 io. 6r sheathing, building paper and 30 0.86 yellow pine lap siding............ _.......... 1 in. nr sheathing, building paper and 20 050 stucco................................. ...... Pine Sap siding and building paper. Biding 20 -- 0.82 -- 4 in. wide............................. YeUow nine Ian Riding 16 035 1.28 1.16 2.00. 1.22 1.18 0.78 (4) (4) (4) (4) (4) MASONRY MATERIALS z:Common yellow clay brick*-....-..... ....... One tier yellow common day brick, one tier face brick, approx. 8 in. thick*-....... :: 5.0* 030 43 031 0.77 (2) (4) 1.30 (4) 8 ::z E;Clat Tils, Hollow__ __ __ 2 in. Tile, lA ia. plaster both sides.............. 120.0 4 in. Tile, H in. plaster both Rides 127.0 6 in. Tile. H ia. Blaster both nirtes 1243 5 la. Tile, average of types (Walls No. 110 100 105 1.00 0.60 0.47 58,63,64. 66. 67,90. 91,92*)...-............ 12 in. Clay tile wall: 8 in. x 5 in. x 12 in. 052 and 4 in. x 5 in. x 12 in.* . . 036 1.00 (2) 1.67 2) 2.13 h> 1.92 (4) 334 (4) Cqncbete .. ............. ...... Sand and gravel aggregate, various ages 1135 and mixes.................. to Sand and gravel aecrroate I/imratone avrrrpirnto Cinder aggregate.-.................. 1636 142 75 12.6 132 75 10.8 97 75 4.9 Steam treated limestone elag aggregate*.... Puutice (Mined in California) aggregate*Expanded burned clay aggregate*,--.___ Burned clavavzreratfi* Blast furnace slag aggregate- ......... Expanded vcrmiculite aggregate--____ _... Expanded vermiculite aggregate..... 74.6 65.0 59.9 67.1 76.0 20 26.7 75 75 75 75 70 90 90 237 2.42 238 238 1.6 0.6S 0.76 ! i i i i 1Ill l I 0.09 to 0.06 (5) EE0.03 (4) 0.09 (4) 0.22 (4) 0.44 4) 0.41 4) 0.44 (4) ` r(3)0.35 4) 0.63 1.47 132 Authorities: 1 U. S. Bureau of Standards, tests based on samples submitted by manufacturers. * A. C. Willard, L. C. Lichty and L. A. Harding, tests conducted at the University of Illinois. 3 J. C. Peebles, tests conducted at Armour Institute of Technology, based on samples submitted by manu facturers. * F. B. Rowley, et al, tests conducted at the University of Minnesota. s A.S.H.V.E. Research Laboratory. 6 E. A. Allcut, tests conducted at the University of Toronto. Minnesota Engineering Experiment Station Bulletin No. 12). B. Algren (University of P r ?^t/TrlnnIHr8ilo^Through inflation as Affected by Orientation of Wal b. Lund (A.S.H.V.E. Transactions, Vol. 49, 1943, p. 331). by F. B. Rowley and C. actions, Vol. .. ------49, 1943, -pm. u1v9u8)..u wcuiu^ iiumsuuu, uy u. d. iuues ana it. Jtt, Vianey (A.&.H.V.E. Trans * See A.S.H.V.E. Research Report No. 915--Conductivity of Concrete, by F. C. Houghteh and Carl Gutberiei (A.S.H.V.E. Transactions, Vol. 38, 1932, p. 47). ' See Heating, Ventilating and Air Conditioning, by Harding and Willard, revised edition, 1932. S See BMS13, U. S. Department of Commerce, National Bureau of Standards, Washington, D. C. * Hoofing, 0.15 in. thick (1.34 lb per square foot), covered with gravel (033 lb per square foot), combined tnickness assumed 0.25.