Document 5br7ZX7ZJOkbKwrL9a2qvBXGD

HEATING VENTILATINC AIR CONDITIONING CUIDE 1941 Table 6. Coefficients of Transmission (I/) of Frame Interior Walls and Partitions* Coefficients ore expressed in Bin per hour per square oot per degree Fahrenheit difference in temperature between the atr on the two sides, and are based on still air (no wind) conditions on both sides. TYPICAL CONSTRUCTION ^ELft/TEfc ^rroyy fU/tCR. Type of Wall Wood Lath and Plaster On Studding Metal Lath and Plaster6 Oh Studding Plasterboard in.) and Plaster* On Studding Plasterboard ($ in.) and Plaster* On Studding---bright aluminum foil ce mented to plasterboard on surface nailed to studding H in. Rigid Insulation and Plaster* On Studding 1 in. Rigid Insulation and Plaster* On Studding 1H in. Corkboard and Plaster* On Studding 2 in. Corkboard and Plaster* On Studding Wall No. DOUBLE PARTITION (Finished on Both Sides of Studding) Single Partition (Finish on One Side of Studding] Air Space Between Studding Flaked G?sr Between Studding Rock Wool Fill* Between Studding _H in. Flexible Insulation Between Studding (One Air Space) A 77 0.62 78 0.69 79 0.61 B 0.34 0.39 0.34 C 0.11 0.11 0.10 D 0.076 0.078 0.075 E 0.21 0.23 0.21 80 0.42 81 0.35 82 0.23 83 0.16 84 0.12 0.24 0.18 0.12 0.081 0.063 0.16 0.083 0.066 0.052 0.045 0:063 0.054 0.044 0.038 0.14 0.097 0.070 0.057 Computed from factors marked by in Table 2. Thickness assumed 3% in. 'Plaster on metal lath assumed % in. thick. 'Plaster assumed H in. thick. Table 7. Coefficients of Transmission (U) of Masonry Partitions* Coefficients are expressed in Btu per hour per square foot per degree Fahrenheit difference in temperature between the air on the two sides, and are based on still air (no wind) conditions on both sides. TYPICAL construction No. Plain Walls (No Plaster) Walls Plastered on One Side Walls Plastered on Both Sides Type of Wall 4-in. Hollow day Tile 4-in. Common Brick 4-in. Hollow Gypsum Tile 2-in. Solid Piaster 85 86 87 88 Computed from factors marked by in Table 2. 90 A 0.45 0.50 0.30 B 0.42 0.46 0.28 -- C 0.40 0.43 0.27 0.53 CHAPTER 3. HEAT TRANSMISSION COEFFICIENTS AND TABLES s a I*2 6 S3 i -.s.-5 e es 1 . I. 0" g : of-i ! oE a i $? ;: to 4* *DcO 91