Document 0qNmL7ZpKx43xxoERqnY1QRnd

HEATING VENTILATING AIR CONDITIONING GUIDE 1944 Table 2. Conductivities (k) and Conductances (C) of Building and Insulating Materials These constants are expressed in Bln per hour per square foot per degree Fahrenheit temperature difference. Conductivities (k) are per inch thickness and conductances (C) arefor thickness or construction stated,' not per inch thickness. Material Description (Lb per Mean TEMP (Deo Fabb) Conductivity OB Conductance (H (O Resistance ay-a) E O < BUILDING BOARDS Compressed cement and asbestos sheetsTM Gypsum board--gypsum between layers 123 20.4 . 605 625 in flvjwiim hnnid M in* gypsum board............................ ..... 535 86 110 70 "" 90 2.70 0.48 054 1.41 -- 3.73 2.60 oooo 057 2.08 1.19. (1) (2) (3) (3) (1) FRAME CONSTRUCTION I in. fir sheathing and building paper -- 30 -- 056 COMBINATIONS_________ 1 in. fir sheathing, building pap#r and ypllnw pine lopewlinp 20 050 1 in. fir sheathing, building paper and 1.16 250 Pine Ian siding and building naner. fridincr 20 052 ' 152 4 in. wide........._____________________ -- 16 -- 055 1.18 158 0.78 (4) (4) (4) (4) (4) MASONRY MATERIAIB One ta yellow common clay brick, one tier face brick, approx. 8 in. thickl4_**_*6___ -- -- 6.0* 45 -- **** 0.77 150 sfc o (2) (4) (4) Cut Tile, Hollow.............. 2 in. Tfle, M tn. plaster both sides_______ 4 in. Tile, H in. plaster both sides___________ 8 in. Tile, average of 8 types (Walls No. 59.63,64.66,67,90,91,92*)............... . 12 in. Clay tile wall: 8 in. x 5 in. x 12 in. and 4 in. x 5 in. x 12 in.*__________________ _ 120.0 127.0 1245 -------- -- 110 100 105 - -- -- -- 150 0.60 . 0.47 052 056 150. 1.67 2.13 1.92 354 (2) (2) (2) (4) (4) Sand and gravel aggregate, various ages nnH TT1TYPA _____ _ 1155 to 1656 142 75 12.6 132 . 75 105 Cinder aggregate...____________________ 97 ' ^75- --.4.9 Steam treated limestone dag aggregate*.... 74.6 75 257 Pumice (Mined in California) aggra^at/* 65.0 75 2.42 Exnanded burned rlav unimtea 59.9 75 258 67.1 256 Blast furnace slag aggregate......... 765 70 1.6 Expanded vermicohte aggregate____________ 20 90 ' 0.68 Expanded vermiculite aggregate, ............ ' 26.7 90 0.76 _ - " 0.09 to 0.06 0.08 0.09 052 0.44 0.41 0.44 055. 0.63 1.47 152 (5) (4) (4) (4) 4) (4) (4) (4) (3) (3) ' (3) Authorities: lU. 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. *J* C. Peebles, tests conducted at Armour Institute of Technology, based on samples submitted by manufacturers, . 4F. B. Rowley, et al. tests conducted at the University of Minnesota, A.S.H.V.E. Research Laboratory. E. A. Allcut, tests' conducted at the University of Toronto. m See Thermal Conductivity of Building Materials, by F. B. Rowley and A. B. Algren (University of Minnesota Engineering Experimental Station Bulletin No. 12). 6Heat Transmission Through Insulation as Affected by Orientation of Walls, by F. B. Rowley and C E. Lund (A.S.H.V.E. Journal Section of Heating. Piping 6* Air Conditioning. July. 1943). The Effect of Convection in Ceiling Insulation, by G. B. Wilkes and L. R. Vianey (A.S.H.V.E. Journal Section of Heating. Piping 6* Air Conditioning. February, 1943). *See A.S.H.V.E. Research Report No. 915--Conductivity of Concrete, by F. C. Houghten and Carl Gutberlet (A.S.H.V.E. Transactions, Vol. 38, 1932, p. 47). Recommended value. (See Heating, Ventilating and Air Conditioning, by Harding and Willard, revised edition, 1932). /See BMS13, U. S. Department of Commerce. National Bureau of Standards. Washington, D. C. *Roofing, 0.15 in. thick (1.34 lb per square foot), covered with gravel (0.83 lb persquare foot), combined thickness assumed 0.25. ., CHAPTER 4. HEAT TRANSMISSION COEFFICIENTS Table 2. Conductivities (k) and Conductances (C) of Building and Insulating Materials--Continued These constants are expressed in Btu per hour per square foot per degree Fahrenheit temperature difference. Conductivities (k) are per inch thickness and conductances (Q are for thickness or construction stated, not Per inch thickness. 95