Document mBkjQyvXjd9DwRn1Nkr2q5kgk

260 CHAPTER 12 1952 Guide " States. The highest temperature ever recorded is for the period of record shown. In some cases it should be noted that this period of. record is com paratively short, and higher temperatures may be, expected. In making comparisons for. other localities than.those shown in Table 3, due considera tion must be given to elevation. . Column 6 of Table 3 indicates the design dry-bulb temperature suggested; by the A.S.H.V.E. Technical Advisory Committee on Weather Design Conditions. This temperature is the maximum hourly, outdoor tempera ture which has been equalled or exceeded 2\ percent of the total hours of. June, July, August and September for the period of record,, in this case, the 5-year period 1935-1939, and should not be confused with the period of . record given in Column 4 which, applies only to highest temperature ever recorded. Since all of these data (Column 4) are based on airport records, they are not necessarily applicable to cities. The data given in Columns 7 and 8 were obtained from local A.S.H.V.E. Chapter Secretaries, and represent the design temperatures in local use. Where such information was not available, it was taken from a publication of the A.C.R.M.A.* and frond various other sources. The Technical Advisory Committee on Weather Design Conditions has suggested that wet-bulb design temperature be taken as that wet-bulb temperature which has" been equalled or exceeded 5 percent of the hours during months of the period of record. While not available for the 1951 edition of The Guide, due to the tremendous task of compiling these data, it is hoped that they will be available for some stations for future editions. The wind velocity to be used in design should be that wind velocity which accompanies the design temperatures in each instance, but since these data are not-available, the average-summer wind velocities for the period of record , were taken from U. S. Weather Bureau- records revised to 1948. It is pointed out that this is not necessarily the velocity which coincides with the design temperatures, but it may serve as a guide to the designer. Other weather data, such as daily range of temperature, are useful particu. larly when making cooling, load calculations for an early morning peak on an east exposure. Daily range of temperature is the difference between the average of the daily maximum dry-bulb temperatures and the aver age of the daily minimum temperatures. This range is highest in semiarid or desert regions and at high elevations, and lowest near the oceans or very large lakes. The daily range of temperature (Fahrenheit de grees) in July for the principal areas of the United States can be ap. proximated from the following tabulation: East Sea Shore.. ....... 12 to 18 East of Mississippi River................. .......... 19 to 24 Gulf Sea Shore............ 12 to 18 Mississippi River to Rocky Mountains... .24 to 33 Great Lakes Shore.... 18 to 21 Rocky Mountain Area................................. 33 to 42 West Sea Shore...... . 15 to 20 West Coastal States..................................... 20 to 36 Ventilation Rate The introduction of outside air is necessary for the ventilation of condi tioned spaces. Chapter 6 suggests minimum outdoor-air requirements for representative applications; but it is to be emphasized that minimum re-; quirements are not necessarily adequate requirements for all psychological attitudes and physiological responses. Local codes and ordinances frequently specify ventilation requirements, for public places and for industrial installations. Recommended and minimum ventilation rates for. the most common. Cooling Load 261 . , Table 3. Summer'Climatic Conditions Suggested Design Wet-Bulb and Dry-Bulb. Temperatures Col. 1 State Col. 2 Station^ Col. 3 Col. 4 Eleva tion . Period of. Record11 Ft Col. 5 Col. 6 . Col. 7 Highest Temp. Ever - Recorded" Design Dby-Bulb Temp, on T.A.C. 24% Design Dry-Bulb Temp, in Common Basis Uset F F F Col. 8 Col. 9 Design WeivBulb Temp, in Average ' Summer I Wind Velocity* Mph Ala. Anninnton . .. . CO Birmingham. ..CO Birmingham. ., AP Mobile............ . (JO Mobile............. . AP Montgomery. ..(JO Montgomery.. ..AP Ariz.... Flagstaff......... CO KincmAD....... AP , Phoenix...... . CO Phoenix......... ..AP Turnon............ . AP ; Winslow.......... CO Winslow__ ..AP Yuma.............. . CO Art.... Fort Smith;.. CO Fort Smith:.. . AP . Little Rock... . CO Little Rock... ..AP Calif... Bakersfield___ AP Burbank......... . AP - Daggett___ .AP Eureka............ ..CO Fresno............. ..CO Fresno............. AP Los Angeles... CO Oakland......... AP Red Bluff..... CO Red Bluff..... AP Redding......... .AP : Sacramento... CO j Sacramento... AP 'San- Diego....... . .CO San Diego.... .AP - San Francisco. .CO San Jose......... CO Williams......... AP Colo...... Denver........... CO Denver............ .AP Durango......... CO Grand Juncfcion.CO Pueblo............ CO Pueblo............ .AP Conn.... Hartford......... CO Hartford......... AP New Haven... CO New Haven... AP D. C. .. Washington... (JO Washington... AP Fla........ Apalachicola.. CO Jacksonville..'. (JO Jacksonville... AP Key West........ (JO Key West....... AP Miami............. CO Miami.............. AP Pensacola....... (JO Pensacola....... AP Tamoa............ (JO Tampa.............. AP Titusville......... AP Ga......... Atlanta............. AP Augusta............ .CO Augusta....--- AP Macon............... .CO Macon............... .AP Savannah......... .CO Savannah......... .AP Idaho... Boise................. (JO Boise................. AP Burlev..!......... AP Idaho Fails ... -AP Lewiston........... CO Pocatello........... CO n. Pocatello.......... AP Cairo ....... ,... CO' Chicago............. AP . j-Moline............... AP 733 1893-1947 ; 711 * 1893-1945 ' 615 ^ 1939-1947' 143 1872-1947 ' 219 1940-1947 293 1872-1947 226 1938-1944* 6957 ' 1899-1947 3473 1935-1939 1122 1895-1947 1112 1933-1947 2561 1935-1939 4853 Up to 1946 4899 1937-1947 146 1876-1946 545 1882-1945 463 1945-1947 451 1879-1942* 282 1942-1947 499 1937-1946' 740 1931-1947** 1925 . 1935-1939 132 -1886-1947: 387 1887-1939'281 ' 1939-1947 . 534 1877-1947 ' 21 : 1929-1947'. 305 1877-1934r 346 1944-1947: 579 1935-1939 \ 116 1877-19471 22 . 1936-1947 90 1871-1940* 34 . . 1939-1947 164 1875-1947 . . 100 Up to 1946 124 1935-1939 5398 1871-1947 6379 . . 1934-1947 6558 ' Up to 1946 . 4587 Up to 1946 4770 1889-1938 4810 1939-1947 229 1905-1940* ` 20 1940-1947180 1872-1947 ' 17 1943-J947; 128 ,1871-1947 . 20 ' - 1935-1939 23 1922-1947 104 1871-1947 29 1938-1947 23 1871-1947 48 1939-1947 253 . .1896-1947' . 13 '1940-1947 67 . 1879-1947. 113 . 1943-1947, Ill . 1890-1940 12 1941-1946"* 52 1935-1939 1020 1935-1939 ' 195 1871-1946 424 . 1939-1947 408 1899-1947 .432 . 1930-1947 116 1871-1945** : 56 1939-1947 2818 ` 1864-1939 2849 . 1939-1947 4150 ' 1935-1939 4744 , 1935-1939 763 . 1906-1944* 4522 1899-1947 4467 1938-1947 319 1872-1947 601 Up to 1946 ` 615 1935-1939 594 1932-1947 105 107 103 103. 104 ' 107' 103 93 107 218 111172; 107. 103 120 113 107 110 107 113 ' 111 113 85 115 111 * 109 102 115 112 . 112 . 114 108 : 110 110016 106 116 105. 104 . 99'. 105 104, 104 101 101 94 106 . 106 102 ' 104 105 ' 100 95 96 . 100 103 105 98 9898 102 ' 106 ` 105' 105' 102 - ' 105 ` 105 112 109 ' 104 100 117 : 105 103 106' 105 107 106 `.;'94 92 ,95 95 .95 95 . 99 i07 102 .95 97 104 . 94 104 . . 103 80 101 105 100 110 95 : 95 105 90 105 90 . ,85 1 JlOO ioo ;79 .103 95 84 92 94 89 90 93 . 93 95 94 88 92 92 94 -j },9&1 95 ! 95 95 95 .93 95 95 95 95 . 98 \91 95 5 95 95 98 ' 95 95 95 95 '. 95 68 `95 96 78 ! .... 78. 5.4 '80 . 8.0 '78 65: 76 ' `72 . 70 '78-- 76 ` 6.0 !!! 6.1 78 6^2 7o . 65 : 74 . TO 65 ' 70 72 68 65 70 64 :0$65 65 75 `75 78 80 78 `78 '79 :- 78 - 78 7^9. 5^8 ?:9 10^7 6.9^ 6.3 7.4 7.4 76 7.9 76 78 78 8.0 65 5'8 65 ' 65 78 ' -= 75 ' 76 ' M.