Document pBMKpVn7w4gDg4Xj6ReLrdLd6

HEATINC VENTILATING AIR CONDITIONING GUIDE 1942 Table 1. Design Dry- and Wet-Bulb Temperatures, Wind Velocities, and Wind Directions for June, July, August, and September State Cm Design Dbt-Bulb Design Wet-Bulb Summer Wind Prevailing Vslocitt Summer Wind MPH Direction Ala_________ Ariz__ ___ Ark................ Calif.............. Colo.............. Birmingham. .. Mobile..................................... Phoenix................................... San Francisco.:....... ;............. Denver.... .................... ........... DpI D. C............. Fla. P.a Idaho....... ..... III................. Ind_________ Tampa.................................... Savannah................................ Boise.................... ................... Peoria...................................... Indianapolis. ........................ Kansas_____ Wichita................................... Ky-------------- Louisville.... ..................-....... Shreveport.............................. Maine.___ Portland. ............................... Md__ ______ Baltimore........ ....................... Mo................ Kansas City........................... St. Louis................................. Nebr....; Nev________ Reno_____________ ________ N. H............. N. J------------ Trenton................................... N. Y..:......... Albany..... -...............-........... Buffalo.... ................. .............. New York............................... N. M_______ Santa Fe................................. N. C.......... ... Wilmington............................ N. Dak....;.... Ohio.............. Cincinnati................. -........... Cleveland--............................. Okla.............. Oklahoma City...................... Ore.......... Pa................ Pittsburgh....................... ....... R. I___ _____ Providence--........................... S. C............... Charleston................................ Greenville-- .......................... S. Dak______ Sioux Falls............................... Tenn........ ..... 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 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 75 75 75 65 75 79 73 ' 78 75 76 65 78 75 75 80 . 76 75 77 78 5.2 8.6 6.0 70 ft o 11.0 6.8 73 q7 fi 9 7.0 7,3 7.8 5.8 1ft 9 8.2 9.0 6J5 11.0 8.0 70 6.2 7.3 6.9 Q9 lh.3 ft 4 62 9.5 9.4 73 93 7.4 5 ft 10.0 7.1 12.2 12.9 6.5 5J> 7.8 ft ft 6.6 9.9 10.1 66 97 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 NF. s sw SW s sw sw s s . sw sw sw SF. 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- 140 CHAPTER 7.' COOLING LOAD Table 1. Design Dry- and Wet-Bulb Temperatures, Wind Velocities, and Wind Directions for June, July, August, and September (Concluded) State Crrr Design Dht-Bulb Design Wet-Bulb Summer Wind Vblocitt MPH Prevailing Summer .Wind Direction 100 78 9.4 s El Paso...................................... 100 Galveston................................. 95 69 80 6.9 E 9.7 s Houston.................................... 95 78 7.7 S San Antonio............................ 100 78 7.4 SE TTfnh 92 63 8.2 SE \?t 90 73 8.9 S Va 95 78 10.9 S Richmond. ........................... . 95 78 6.2 SW Spokane...... :............................. 85 .90 65 65 7.9 6.5 S sw W Va. Wis Milwaukee................................ 95 95 95 75 75 75 5.3 SE 8.1 sw 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 6 (except that flow of heat is reversed) by means of the formula: Ht = AU(to-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. < <o = 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 4). 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. 141