Document NEka0qgRq3JeM37494YJBO8Zp

American Society of Heating and Ventilating Engineers Guide, 1933^ Table 1. Average Maximum Design Dry-Bulb Temperatures, Design Wet-j/J; Temperatures, Wind Velocities, and Wind Directions for w June, July, August, and September State ClTT Average Maximum Deuign Dbt-Buu Design Wet-Bulb Summer Wind Velocttt <^ETW MPH O'Mcna Ala Mobile.......... ;.............. ... .... Ark............... Little Rock............................ Calif,.--..... Los Angeles........................... San Francisco.......... ............. Colo.......... . D. C............. Fla Jacksonville........................... r.a Atlanta................................... fll InH Ky Louisville............................... MH Mn Kansas City........................... Mont........... N. J............. N Y. MM N. C. ... N Dak. Pa." RT <; r Chattanooga..... .................... Memphis. ............................. 93 94 110 95 88 85 90 88 95 94 94 91 95 95 95 91 90 92 94 94 85 93 88 93 84 95 92 95 87 93 93 95 90 83 95 87 87 93 88 95 95 96 83 95 91 85 94 93 . 94 93 77 5.2 78, 8.6 77 6.0 77 7.0 70 6.0 68" li:0 64 6.8 74 7.3 78 6.2 78 8.7 79 7.0 75 7.3 79 7.8 65 5.8 75 10.2 75 8.2 73 9.0 74 6.6 75 8.0 79 7.0 71 7.3 76 6.9 73 9.2 73 10.3 72 8.4 78 6.2 75 9.5 78 9.4 63 7.3 74 9.3 64 7.4 76 10.0 74 7.1 72 12.2 75 12.9 63 6.5 72 5.6 79 7.8 69 8.8 73 9.9 78 6.6 76 10.1 65 6.6 78 9.7 73 9.0 73 10.0 80 9.9 76 6.8 76 6.5 77 7.5 Chapter 8--Cooling. Load iuuytmum Design Dry-Bulb Temperatures, Design Wet-Bulb table 1- Average maai velocities, and Wind Directions for TABL TbmpE^XK August, and September (Continued) 9tat* Citt Average Maximum Design Drt-Bulb Design Wet-Bulb Summer Wind Prevailing Vblocitt MPH Summer Wind Direction Texas-- Dallas------------Galveston-------San Antonio.-- Houston....... -- El Paso.Salt.Lake_City-- Burlington......... Norfolk............... Richmond--.... Seattle-............. Spokane............. Parkersburg...... Madison............. Milwaukee......... Cheyenne........... 99 93 100 93 98 95 --85 91 95 83 89 90 89 93 85 76 9.4 79 9.7 78 7.4 79 7.7 69 6.9 67 8.2 71 -- 8:9 76 10.9 78 6.2 61 7.9 63 6.5 74 5.3 73 8.1 74 10.4 62 9.2 S s SE S E SE --S S. SW S SW SE SW S S COOLING LOAD The cooling load may be divided into the following parts: 1. Transmission of heat through walls, roof, and glass with allowances for sunexposed surfaces and heat capacity. 2. Transmission of solar radiation through glass and absorption by interior furnishings. 3 Heat and moisture from infiltration and from outside air introduced. 4. Heat and moisture from occupants and heat from lights, machinery and other sources. Transmission for Surfaces Not Exposed to the Sun The transmission load for surfaces not exposed to the sun is calculated in a manner similar to that described in Chapter 7, by means of the following formula: Ht = AU {to - t) . (1) where fit = heat transmitted through the material of the wall, glass, roof, or floor, Btu per hour. net inside area of wall, glass, roof, or floor, square feet. 1 = inside temperature, degrees Fahrenheit. jo = outside temperature, degrees Fahrenheit. T7 = coefficient of transmission of wall, floor, roof, or glass, Btu per hour per square foot per degree Fahrenheit difference in temperature. (Tables 3 to 13, Chapter 5.) Outside Temperatures - Summer dry-bulb and wet-bulb temperatures for various cities are given in Table 1. It will be noted that the temperatures are not the maxipiums but the design temperatures which should be used in airconditioning calculations. The maximum outside wet-bulb temperatures 147