Document zbpdaxzgombvYkwv2aV4neBe7

American Society of Heating and Ventilating Engineers Guide, 1937~~~ Table 1. Design Dry- and. Wet-Bulb Temperatures, Wind Velocities ami Wind Directions for June, July, August, and September State ClTT Ala______ Birmingham.. Ariz______ MobilePhoenix.______ Ark______ ... Little Rock.__ Calif_______ Los Angeles..... San Francisco.. Colo..... ......... Denver_______ Conn........ . New Haven___ D. C.......... Washington..... Fla______1. Jacksonville___ Tampa Ga____ Atlanta.. Savannah.. Idaho____ BoiseIU________ Chicago--......... IndIowa.. Ky-------La____ . Maine__ Peoria__ ---__ Indianapolis..... Des Moines___ Louisville_____ New Orleans--Portland______ Md_____ Mass.. Mich-- Minn.. Baltimore_____ Boston--.......... Detroit--......... Minneapolis__ Miss.._ Vicksburg. Mo-___ Kansas City.__ St. Louis.... ....... Mont___ Nebr.___ Nev_____ N. J----- N. Y...... : Helena________ Lincoln.. Reno...... ....... Trenton-___ Albany.......... Buffalo_____ N. M- New York--_ Santa Fe___ N. C._ Asheville-- N. Dak,... Ohio_____ WilmingtonBismarck.. Cleveland- Okla.. OregPa___ CincinnatL. Oklahoma CityPortland.. Philadelphia... Pittsburgh___ R. I..,_.. S. C.___ Providence___ Charleston___ Greenville-- Tenn._ Chattanooga.. Texas....... Memphis.____ Dallas_______ Galveston____ San Antonio.... Houston_____ El Paso.______ Design Drt-Bulb Design Wet-Bulb Summer Wind Velocjtt MPH SrauEaWnj Diascnos 93 94 110 95 88 85 90 88 95 ' 94 94 91 95 95 95 91 ~ 90 92 94 94 85 93 88 93 93 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 99 93 100 93 98 77 78 . 77 77 70 68 64 74 78 78 79 75 79 65 75 75 73 74 75 79 71 76 , 73 73 72 78 75 . 78 63 74 64 76 74 72 75 63 72 79 69 75 78 76 65 78 73 73 80 76 76 77 76 79 78 79 69 5.2 8.6 6.0 7.0 6.0 11.0 6.8 7.3 6.2 8.7 7.0 7.3 7.85.8 10.2 8.2 9.0 6.6 8.0 S. 7.0 7.3 6.9 9.2 10.3 8.4 6.2 9.5 9.4 7.3 9.3 7.4 10.0 7.1 12.2 12.9 6.5 5.6 7.8 8.8 9.9 6.6 10.1 6.6 9.7 9.0 10.0 9.9 6.8 6.5 7.5 9.4 9.7 7.4 7.7 6.9 S SW W NE SW SW s s s Sw E NW SW NW NE S SW SW SW SW S SW SW SW SE SW S SW SW s w SW' .s sw sw SE SE SW NW S SW S NW SW NW NW SW . NE SW SW s s SE s E 158 Chapter 8---1Cooling Load Table L Design Dry- and Wet-Bulb Temperatures, Wind Velocities, and 1A Wind Directions for June, July, August, and September (Continued) ClTT Design Dry-Bulb Design Wet-Bulb Summer Wind Prevailing VEDOClTT Summer Wind MPH Direction Utah-- Salt Lake City.------------------- 95 85 67 71 8.2 SE 8.9 S Vt------ 91 76 10.9 S Va-----VVash- 95 78 83 61 89 63 6.2 7.9 . SW s 6.5 sw 90 74 5.3 SE W. Va.. Wis--- Wyo- Cheyenne--------------------------- 89 93 85 73 74 62 8.1 10.4 9.2 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 sun- exposed 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. - Sensible Heat Conducted 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: a rr /a where Ht = heat transmitted through the material of the wall, glass, roof, or floor, Btu per hour. A = net inside area of wall, glass, roof, or floor, square feet. I = inside temperature, degrees Fahrenheit. lo = outside temperature, degrees Fahrenheit. U = 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.) Design 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 maximums but the design temperatures which should be used in air conditioning calculations. The maximum outside wet-bulb temperatures as given in Weather Bureau reports usually occur only from 1 per cent to 4 per cent of the time, and they are therefore of such short duration that it is not practical to design a cooling system covering this range. The temperatures shown in Table 1. are based on a study of hourly, tempera- 159