Document 85wrB0xmxxbNJO4MJ6px8mOLy

252 CHAPTER 12 . 1950 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| per cent of the total hours of June, Juiy, 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.1 and from 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 per cent of the hours during months of the period of record. While not available for the 1950 edition of The Guide, due to the tremendous task of compiling these data, it is hoped that they will be available f<jr 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 to18 East of Mississippi River.......................... 19 to 24 Gulf Sea Shore.................12 to18 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 253 Table 3. Summer Climatic Conditions* Suggested Design Wet-Bulb?and Dry-Bulb Temperatures Cob. 1 State Col. 2 Station* Col. 3 Elev ation* Ft Col. 4 Period or Record* Col. 5 Col. 6 Highest Temp. Ever Recorded* Design Drt-Bglb Temp, on TA.C. VA% Basis* P F Cou 7 Design Dbt-Bulb Temp, in Common Use* F Ala.--------- CO 733 711 AP Ate 1893-1947 1893-1945 t9.V)liQ47 106 107 103 ,00 143 1872-1947 103 ...AP 219 1940-1947 104 --CO 293 1872-1947 107 AP 226 1938-1944* 103 00 6957 1899-1947 93 -AP 3473 1935-1959 107 00 1122 1895-1947 118 AP 1112 1933-1947 117 AP 2561 1935-1939 112 - 00 4853 Up to 1946 107 AP 4899 1937-1947 103 00 146 1876-1946 120 00 545 1882-1945 113 AP 463 1945-1947 107. 00 451 ,1879-1942* 110 AP 282 1942-1947 107 r.ur Bakersfiekl-------------- AP 499 1937-1946 113 __ AP 740 1931-1947* 111 AP 192S 1935-1959 113 Eureka_____ 00 132 . 1886-1947 85 CM 387 1887-1939 115 AP 281 1939-1947 111 00 -534 1877-1947 109 . AP 21 1929-1947 102 CO 303* 1877-1934 115 Red BhifT--.... - AP 346 1944-1947 112 ___AP 579 1935-1939 112 116 1877-1947 114 Sacramento._______ AP 22 1938-1947 108 00 90 1871-1940 . 110 Sao Dieco-- AP 34 1939-1947 106 San Frandsoo______ CO tot 1875-1947 101 San Jose. 00 100 Up to 1946 106 AP 124 1935-1939 116 CO S39S 1871-1947 , 105 Denver Duraiuro.. AP 5379 .CO . 6558 1934-1947 Up to 1946' 104 .99 Grand Junction...... CO 4587* Up to 1946 105 00 4770 188*3-1938 104 Pueblo-................ AP 4810 1939-1947 104 . Conn- ... HarUnrd 00 229 1905-1940* 101 Hartford AP 20 1940-1947 98 New Haven. - OO 180 1872-1947 101 AP 17 .1943-1947 94 D.0______ Washington_____ CO 128 .1871-1947 106 .Washington..___ AP 20 1935-1939 106 vu. CO ` 23 19.22-1947 102- Jacksonville 00 104 1871-1947 104 Jacksonville-- , AP 29 1938-1947 105 Key West (X> 23 ;1871-1947 100 Key West. AP . 48 .1939-1947 95 Miami 00 253 !1896-1947 96 Miami AP 13 1940-1947 too Pensacola.. CO 67 :1879-1947 103 Pensacofci.__ Tmp* AP r 113 CO 111 -1943-1947 105 1890-1940 ! 98 Tampa Tituavilta n AP . AP 5 12 52 1941-1946* ; '1935-1939 98 98 102 Aupnata- -oo 195 1871-1946 106 Aurnsta AP 424 1939-1947 105 Mason a) 408 !1899-1947 105 Maonn AP f 432 :1939-1947 102 Savannah-__ Ravniimh Idaho______ Buisn. 00 115 AP 56 00 ' 2818 1871-1945* 1939-1947 1864-1939 103 105 112 Ht/ue AP 2849 1939-1947 109 Burley.... AP 4150 1935-1939 104 Idaho Falls-- --. AP 4744 1 OO 763 1935-1939 1900-1944* 100 117 Pocatello. . 00 4522 1899-1947 105 AP : 4467* .1938-1947 103 111 106 Chiewpo 00 j 601 Up to 1946 105 Cbi**rt Mnlirw. AP 1 615 ! 1935-1939 . 107 ____AP j . SM-. 1932-1947 106 . - . . ; __ _94 92 -- __ 99 -- 107 102 __ 95 __ -- -- 97 104 94 104 _103 80 __ -- 101 . -- __ 79 . -- 103 93 __ __ 95 -- 88 84 92 94 ___j. 89 ___ . 90 93 _ 93 95 94 88 92 92 9i 95 95 . 96 . * 95 90 1 . 105 ___ 105 100 __ 110 95 ..... 95 __ 105 -- _ 90 10S __ 90 85 100 ... . 100 ___, 85 85 91 .. ` 95 . .. 95 95 95 93 -- .. 95 95 . ... 95 95 __ 98 ,,, 91 __ 95 __ 95 ,, 95 98 95 95 95 _. _,,. 95 95 98 95 ,, ,, . 96 Col. 8 Dbsign Wet-Bulb Tbmp. in Common Use' op Col. 9 Average Summer Wind Veloott* Mph - 78 78 _ 80 . 78 __ 65 76 ... 72 70 __ 78 . 76 78 . ___ 70 __ __ 65 70 70 65 70 __ 72 -- 68 -- 65 70 . 64 __ 65 65 65 75 ,, _7_S 78 80 _78 78 _ 79 -- 78- _' _5.4 _8.0 __ _ 6.0 __ __ _-- 6.1 __ 62 . __ -- __ __ 7.9 _ 5.S __ 7J9 __ 10.7 __ __ 6.9 . -- 6.3 - ___ __ -- 7.4 __ , 5.9 -- 8.4 __ . ---8.7 __ 78 7.4 . . __. , __ 76 7.9 76 78 . 78 __65 .. . 65 65 1-- .-- 8.0 __ S.8 ___ -- _ ___ 78 _.. 75 9J . '.76.