Document KzG9n16D7oX3X5KzVB9r9mQXr

American Society of Heating' and Ventilating Engineers Guide, 1932 Table 18. Coefficients of Transmission (U) of Concrete Walls with No Exterior Finish Note.--These coefficients are expressed in Btu per hour per square foot per I dec fahr difference in temperature between the air on the two sides and are based on an outside wind EXPOSURE of 15 MILES PER HOUR. ' Thevaluesof UmlhtsTable are basedonthefollowinq Internal CbnductivihesorCbnductanoes which are expreSsednb.tu.perUn per^Ft per 1 F ^ Concrete(Stone lil:4mi<) 8.30 per 1 ^ Plasterboard, 3.75 ps*| Plaster (Gypsum) 2.32 perl' Wood Lath Plaster 200 as applied Cork board 0.30 perl^ fciqtd Insulation (Boardform) 0.33 perl' Cellular Gypsum (18*) 0.5^ perl^ Flaked Gypsum, Dry (24 ) 0.48 perl '* o' , r 1--- & o' - * ` /-* . *; . .* 4 Number V Thickness of Insulation where specified Interior Construction 1 Plain Walls - No Interior Finish > 1 ^Raster on Concrete Ye A Thicknes9of Concrete --X. 8' 10" \TC 14>* 20* B c DE F 0.583 0.512 0.455 0.411 0.345 3.214 0.518 044.1 0-41fc 0.378 0-320 1277 3 Rasteron Metal Lath -- Furred 0.331 0.314 0.212 0.273 0-141 0-W> 4 ^ Raster on Wood Lath -- Furred 0.320 0.217 0.277 (1260 0.231 0.208 5 -L Plaster on & Raster board-Furred 0.322 0.211 0.171 024.1 0232 0261 Rasteron WoodLathon 2 Furrinq 6 strips -Cellular Gypsum FUI b a <!' 0.202 0.112 0.185 0.176 0.162 0.151 7 Plaster on WoodLathon 2 Furrinq Strips -- Ftaked Gypsum Fill a 4" 0.127 a 170 0-163 0157 0146 0137 8 y Rasteron Giqid Insulation (Boardform) Furred 1 2i" 0.221 0.217 0 207 0.117 0180 0.166 r 0.170 0.164 0.157 0.152 0.141 0.132 10 4r Plaster on Corkboard set in-L Cement Mortar U 0.142 0.138 0.134 0.131 0.122 0.116 . 2 0.116 0-113 0.101 0.106 OAOt 0.017 Based on 1M in- the actual thickness of 2 in. furring strips. . bThe coefficient used for cellular gypsum. 0.59 is for 18 lb. weight--weights as low as 12 lb. may be used. 50 Chapter 3--Heat Transfer Through Materials and Constructions Table 19. Coefficients of Transmission (U) of Cinder and Concrete Block Walls b-d Sole.--These coefficients are expressed in Btu per hour per square foot per 1 deg fahr difference in temperature between the air on the two sides and are based on an outside wind EXPOSURE OF 15 MILES PER HOUR. The values of U in this Table are basedonthefollowinq Internal Conductivities or Conductances which are expressed in B.t.u. per Hr. per Sq.ft, per |*F Cinder Blocks 8"=0.45 Concrete Blocks 8"=0.84 Cement Mortar Plasterboard Plaster (Gypsum) Wood Loth 4 Plaster Cork board Eiqid Insulation (Boardform) CellularGypsum (18*) flaked Gypsum, Dry (24*) 12*= 0-28 I2"=0.S2 8.00 per f 3.73 perf 2.32 perl" 2.00 as applied 0.30 perl" 0.33 perl" 0.54 perl" 0.48 per l" Y=Ttnckness<jf tnsutationwhere specified L -Oto . Interior 3 Construction Z i Plain Walls - No Interior Finish Thickness - X and Kind of Blocks Y SCinder 8 Concrete 12 Cinder l2Concrete A B co 0.311 0.458 0.211 0.343 2 2 Rasteron Blocks 0.211 0.416 0.201 0.311 3 5 Plaster on Metal Lath - Furred 0.225 0.Z13 0.173 0.241 4 ^ Plasteron Wood Lath - Furred 0.216 0.278 0.167 0.231 5 ^ PIasteron | Plasterboard-Furred 0.217 a z RasteronWood Lath on Z FurrmqStnps 6 -Cellular Gypsum Fill c if" 0.155 a 7 z Plaster on Wood Lathon 2 Furrinq Strips - Flaked Gypsum Fill if 0.140 0.280 0184 0163 0168 0.232 0128 a 162 0.118 0146 8 i* Y Plaster on Riqid Insulation-- (Board form) Furred 1 1" 2 0.171 r 0.136 0207 0.158 0131 0.114 0.180 0.141 10 1* z Plasteroh Cork, board, set in * Cement Mortar II if 0.118 0.134 0.102 0.1 zz i 0.018 0.101 0.087- 0.101 Based oa 1 in., the actual thickness of 2 in. furring strips. bThe figures on this page may be used with sufficient accuracy for dnder and concrete block walls with stucco exterior finish. ' --_ The coefficient used for cellular gypsum. 0.59 is for 18 lb. weight--weights as low as 12 lb. may be used. <lThe form of the 8 in. blocks on which the figures in. this table are based is shown in the above sketch. The 12 in. blocks are based on two air cells through the block instead of one. 51