Document 3QpaqvvmvaOyLDJvQ9pBa0Kk3

HEATING VENTILATING AIR CONDITIONING GUIDE 1940 Table 2. Conductivities (k) and Conductances (C) of Building Materials and Insulators* The coefficients ore expressed in Btu per hour Per square foot Per degree Fahrenheit per l in. thickness unless otherwise indicated. Material MASONRY MATERIALS Bares Cement Mortar____ Concrete__________ Stone__ Stucco-- Tils os Terratzo___ Description s -|o P O Eg ai S* s"S 6P eP || i si KO i: gg sS o 6 I 1 m % < Low density-...... High density.___ Adobe.------.------Damp or wet___ Typical-- TypicalVarious ages and mixes* ..... . _________ --- ___ Cellular________________ Cellular... Cellular... Cellular... Typical fiber i, 87.5% gypsum aud 12.5% woo u.ps... ................. Special concrete made with an aggregate of hardened clay--1-2-3 mix. Sand and gravel----------------- Limestone...... . . ,_____ ___ Cinder... Burned clay aggregate-- Blast furnace slag aggregate-___ Typical--,, ,____ ______ ____ Typical. Typical hollow clay (4 in.)-- Typical hollow clay (6 in.)*-- Typical hollow clay 18 in.)*-- Typical hollow clay (10 in.)*. Typical hollow clay (12 in.)*. Typical hollow clay (16 in.)*. Hollow clay (4 in.) H-jn. plaster both sides.. Hollow gypsum (4 in.)-- Solid gypsum--------------Solid gypsum.. Typical flooring-- 40.0 50.0 60.0 70.0 51.2 101.0 142.0 132.0 97.0 75.0 76.0 . _______ --___ --..... ... ________ _______ 120.0 127.0 124.3 51.8 75.6 ____ 75 75 75 75 74 70 75 75 75 75 70 _______ _ _____ . __......... _____ _____ no 100 105 _____ 70 76 -- 5.00* 9.20* 3.56* 5.00* 12.00* 16.36 1.06 1.44 1.80 2.18 1.66* 3.98 12.6 10.8 4.9 4.0 1.6 12.50* 12.00* l.OOt* 0.64f* 0.60f* 0.58f* 0.40f* 0.31f* l.OOf 0.60f 0.47t 0.46f* 1.66 2.96 12.00* 0.20 0.11 0.28 0.20 0.08 0.94 0,69 0.56 0.46 0.60 0.25 0.08 0.09 0.22 0.25 0.63 0.08 0.08 1.00 1.57 1.67 1.72 2.50 .3.23 1.00 1.67 2.13 2.18 0.60 0.34 0.08 (2) -- (7) (3) (3) (3) > (4) (3) (4) (4) (4) (4) (3) (21 (2) (2) (4) (4) Authorities: i(j. S. Bureau of Standards, tests based on samples submitted by manufacturers. *A. C. Willard, L. C. Uchty, 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- ..... v . . 4F. B. Rowley, tests conducted at the University of Minnesota. `A.S.H.V.E. Research Laboratory. E. A. Allcut. tests conducted at the University of Toronto. TLees and Charlton. N. *G. B. Wilkes and C. M. F. Peterson, tests conducted at the Massachusetts Institute of Technology. Recommended conductivities and conductances for computing heat transmission coefficients. {For thic^ess stated or used on construction, not per 1 in. thickness. For additional conductivity data see Chapters 3 and 15, 1937 AS.R.B. Data Book. 6If outside surface of block is painted with an impervious coat of paint, add 0.07 to resistance for sand and gravel blocks. Add 0.18 to resistance for cinder blocks. Add 0.17 to resistance for burned clay aggre gate blocks. Recommended value. See Heating, Ventilating and Air Conditioning, by Harding and Willard, revised edition, 1932. *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). *The 6-in., 8-in., and 10-in. hollow tile figures are based on two cells in the direction of heat flow. The 12-in. hollow tile is based on three cells in the direction of heat flow. The 16-in. hoUow tile consists of one 10-in. and one 8-in.'tile, each having two cells in the.direction of heat flow.. /Not compressed. Roofing. 0.15-in. thick (1.34 lb per sq ft), covered with gravel (0.83 lb per sq ft), combined thickness assumed 0.25. . '. , `Values for air spaces or surfaces having an effective emissivity or e = 0.83 and for a temperature differ ence of 15 F. , . _ . ... . Values for air spaces or surfaces having an effective emissivity of e = 0.05 and for a temperature differ ence of 15 F. 94 ' CHAPTER 5. HEAT TRANSMISSION COEFFICIENTS AND TABLES Table 2. Conductivities (4) and Conductances (C) of Building Materials and iNsuLAToks^Continued The coefficients ore expressed in Btu per hour per square foot per degree unless otherwise indicated, Fahrenheit Per l in. thickness', 95 Authority