Document 22qEw7daZYbkBgQ8dereegba

American Society of Heating and Ventilating Engineers Guide, 1936 Table 1. Design Dry- and Wet-Bulb Temperatures, Wind Velocities ANn Wind Directions for June, July, August, and September State ClTT Design Dbt-Bulb Design Wbt-Bulb Summer Wine Velocity MPH Prevailing Summer Wind Direction Ala_____ Ariz........ Ark_____ Calif____ Colo____ Conn___ D. C....... Fla_____ _ Ga______ Idaho___ 111_____ Ind_____ Iowa..___ E= Maine__ Md_____ Mass........ Mich....... Minn____ Miss____ Md._____ Mont....... Nebr........ Nev..... .... N. J------N. Y........ N. M__ ... N. C____ N. Dak.... Ohio_____ Okla_____ Oreg-------Pa-.......... sR. .cI______ ... Tenn.:------ Texas----- Birmingham.-- Mobile.________ Phoenix-............ Little Rock.___ Los Angeles....... San Francisco.... Denver.............. New Haven...... Washington....... Jacksonville...... Tampa............... Atlanta..... ..... Savannah.......... Boise______ Chicago-------- .... Peoria.. Indianapolis... Des Moines... Louisville........ New Orleans... Portland_____ Baltimore....... Boston............ Detroit... Minneapolis... Vicksburg...... Kansas City... St. Louis--..... Helena______ Lincoln_____ Reno.............. Trenton_____ Albany........... . Buffalo........... New York.__ : Santa Fe.. Asheville.____ Wilmington.... Bismarck.____ Cleveland____ Cincinnati. Oklahoma City Portland______ Philadelphia___ Pittsburgh........ Providence....... Charleston__ Greenville.____ Chattanooga___ Memphis.......... Dallas________ Galveston.. San Antonio.___-- Houston________ El Paso._____ ___ 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 7.8 5.8 10.2 8.2 9.0 6.6 8.0 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 NWNE S SW SW SW SW S SW SW SW SE SW .s sw ssw w sw s ssww SE SE SW NW S SW S NW SW NW NW SW NE' SW SW s. ,, s SE s E- 168 . Chapter 8--Cooling Load n sign Dry- and Wet-Bulb Temperatures, Wind Velocities, and Table^J;nJ directions for June, July, August, and September (Continued) Stat* Cm Design Dbt-Bulb Design Wet-Bulb Summer Wind . Velocity MPH Prevailing Summer Wind Direction Salt Lake City.------------------- Vt-............ Va-------------- Wash--........ tvclllv-- ------ - W. Va.......... Wis--....... - Madison.................................. Milwaukee....................... -- Wyo----------- Cheyenne-............................. 95 OO 91 95 83 89 90 89 93 85 67 8.2 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 SE o 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(h-t) (1) 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. t = inside temperature, degrees Fahrenheit. to = 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.) 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 riot the maximums but the design temperatures, which should be used in airconditioning 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 tures in New York City from which factors were derived and applied to 159