Document N2R9eKeJ5oQ41X1QRg6ejG28g

HEATINC VENTILATING AIR CONDITIONING GUIDE 1941 Table 1. Design Dry- and Wet-Bulb Temperatures, Wind Velocities, and Wind Directions for June, July, August, and September State Crrr Design Dby-Bulb Design Wet-Bulb Summer Wind PrEVAJUNq Velocity Summer Wind- MPH Direction Ala_________ Ariz... _____ Ark. Calif. . Birmingham.............................. Mobile............................... ........ Phoenix.............. ....................... San Francisco....... ............. Del_________ nr Fla Ga.................. Wilmington........... .................. Tampa.............. ..... ............... Atlanta............. ......................... Savannah. 111______ ____ Ind_________ Iowa__ _____ Kansas_____ Ky--------------T.a Chicago._______ ___ _________ Peoria......... ................................ Indianapolis. .......................... Des Moines............................... Wichita_____________ ________ Louisville_______ .-...... ......:____ Md_________ Baltimore.____________.._____ Mass________ Boston........ -......................... Mo_________ Mont_______ Nebr...______ Nev_____ _ N. H...... N. J N. V. N. M. nr N. Dak......... Ohio............... Olrla. Ore_________ Pa R. I_________ S. C_________ S. Dak______ Kansas City.............................. St. Louis................. .................. Helena.................................. Lincoln....................................... Reno............................. .-............. Manchester................ .............. Buffalo.......... : New York............... _________ Wilmington___..___ ___ _____ Bismarck.______ ____________ _ Cincinnati..................... ........... Cleveland_______________ _ Portland.................... ................ Pittsburgh....................... ......... Providence. ............................. Charleston__________________ Greenville....... .................. ....... Sioux Falls................... ......... Chattanooga Memphis.............. ....... ............. 95 95 105 95 90 : 90. 95 95 95 95 95 .94 95 95 95 95 95 95 95 100 95 95 100 90 95 92 95 95 95 100 95. 95 95 95 90 95 92 93 , W. 95 90 90 95 95 95 95 101 90 95 95 93 95 95 95 95 95 78 80 76 78 70 65 64 75 78 78 ' 78 79 76 78 65 75 76 76 77 75 76 79 78 73 78 75 75 75 78 76 78 67 75 65 73 78 7755 75 65 75 79 73 78 75 76 65 78 75 75 80 76 75 77 . 78 5.2 8.6 6.0 7.0 6.0 11.0 6.8 7.3 9.7 6.2.-8.7 7.0 7.3 7.8 5.8 10.2 8.2 9.0 6.6 11.0 8.0 7.0 6.2 7.3 6.9 9.2 10.3 8.4 6.2 9.5 9.4 / 7.3 / 9.3 7.4 5.6 10.0 7.1 12.2 12.9. 6.5 5.6 7.8 8.8 6.6 9.9 10.1 6.6 9.7 9.0 10.0 9.9 6.8 ' 7.6 6.5 7.5 s sw w NE SW sw s s sw s sw E NW SW NW NE S SW SW S SW SW S S SW sw sw SE SW S SW sw s w .NW SW s sw sw SE SE SW NW SW S S NW SW NW NW SW NE S SW SW 126 CHAPTER 6. COOLING LOAD , Design Dry- and Wet-Bulb Temperatures, Wind Velocities, and TABLWind Directions for June, July, August, and September (Concluded) State City Design Dby-Bulb Design Wet-Bulb Summer Worn Velocity MPH Prevailing Summer Wind Direction Texas. Dallas....................................... 100 El Paso..................... -............. 100 78 69 9.4 s 6.9 E Galveston................................. 95 80 9.7 S Houston................................... 95 78 7.7 S San Antonio............................ 100 78 7.4 SE Utah............. Salt Lake City.--................... Vt................. Va................. Burlington........... ................... Norfolk. -................................ Richmond. --------------------- 92 90 95 95 63 73 78 78 8.2 8.9 10.9 6.2 SE S S SW Wash............ Seattle. Spokane................................... 85 90 65 65 7.9 S 6.5 SW W. Va........... Parkersburg............................. 95 75 5.3 SE Wis------------ Madison................................... 95 75 8.1 SW Milwaukee............................... 95 75 10.4 S Wyo.--.....-- Cheyenne................. -.......... -- 95 65 9.2 S The components of heat gain, classified by source, are further classified as sensible and latent heat gain. The first two components fall into the classification of sensible heat gain, that is, they tend to raise the temperature of the air within the structure. The last three components not only produce sensible heat gain but they may also tend to increase the moisture content of the air within the structure. Normal Heat Transmission By normal heat transmission, as distinguished from solar heat trans mission, is meant the transmission of heat through windows, walls, partitions, etc. from without to interior of enclosure by virtue of difference between outside and inside air temperatures. This load is calculated in a manner similar to that described in Chapter 5 (except that flow of heat is reversed) by means of the formula: Hi = AU<u-t) (1) where Ht -- heat transmitted through the material of wall, glass, floor, etc., Btu per hour. A = net inside area of wall, glass, floor, etc., square feet. t = inside temperature, degrees Fahrenheit. U> = outside temperature, degrees Fahrenheit. U = coefficient of transmission of wall, glass, floor, etc., Btu per hour per square foot per degree Fahrenheit difference in temperature (Tables 3 to 13, Chapter 3). Solar Heat Transmission Calculations of the solar heat transmitted through walls and roofs are difficult to determine because of periodic character of heat flow and time lag due to heat capacity of construction. 127 -i