Document KGqYrnw6xkxEG6xqYvLBzVg1x

HEATING VENTILATINC AIR CONDITIONING CUIDE 1940 Table 1. Average Maximum Water Main Temperatures3 State ClTT Temp. F State Cm Temp. Ala-- Birmingham________ Mobile.................. ..-- Ariz_______ Phoenix...... ....... . Tucson........................ Calif............ Anaheim..................... Berkeley.... ..... .......... Fresno.... .................... Fullerton........ Glendale..................... Los Angeles............... Oakland...................... Ontario....................... Pasadena.................... Pomona...... ................ Riverside.................... Sacramento............... San Bernardino........ San Diego...-............. San Francisco;.......... Whittier...................... Colo---------- Denver........................ Conn.____ :. Bridgeport................. Hartford;.................... New Haven............... Waterbury..--........... D. C______ Washington............... Del__ ____ Wilmington............... Fla_____ _ Jacksonville............... Miami....... ...... ........... Tampa....................... Ga________ Atlanta....................... Macon............. -......... 111.-.......... Chicago.;......... .......... Cicero................. . Evanston...... -.......... Peoria.............-.......... Rockford........... -- Springfield......--... Ind-- Evansville.... ..... Gary............................ Indianapolis.-........... South Bend________ Terre Haute-...... .... Iowa.-........ Cedar Rapids.---;... Des Moines......... ... Sioux City.................. Kans.._.:..... Concordia................... Kansas City--........... Topeka....................... Wichita.... .................. ...... Louisville................... La--............ Baton Rouge............ New Orleans...... ...... Me.............. Augusta...................... Md.............. Baltimore................... 84 73 81 80 60 69 72 75 6S 75 69 70 82 75 78 72 65 .82 62 75 75 66 73 76 72 84 83 80 80 77 87 . 80 76 76 . 73 67 59 82 86 75 80 61 82 78 77 62 57 86 88 72 85 85 60 75 Mass........... Boston. ________ Cambridge............. u. Fall River. ............ Lowell. ...................... Lynn!.......................... New Bedford............ Salem.........i................ Worcester.-------------- Flint........................ Grand Rapids........... Highland Park.____ Jackson--................ -- Kalamazoo........... .. Lansing--......... --..... Saginaw...!................. Minn-------- Duluth............... ....... Minneapolis.............. St. Paul-- ------------- Mo........... Jefferson City..-...... Kansas City......... St. Joseph--------------- St. Louis.--............... Springfield -- Nebr.---.__ Lincoln....................... Omaha........................ Nev... ......... Reno.....,... ................:. N. ..... Manchester............... N.J.l Newark..... ................. Paterson..................... Trenton........ ............. N. Y... ....... Albany----- -------------- Jamaica___ ___ ___ Mt. Vernon............... New Rochelle---- New York, v __ : Rochester________ .... Schenectady--........... Syracuse______ _____ Utica------ .................... Yonkers...................... N. C...-.... Asheville----------------Charlotte.-:^__ _____ Winston-Salem........ N. M......:.. Albuquerque.....'.___ Canton_____________ Cincinnati. _ _____ Cleveland.................. Columbus.................. Dayton....................... Lakewood.................. Springfield... Toledo. - ............ 80 70 76 50 68 70 68 76 77 70 84 77 56 53 64 82 55 80 77 82 84 84 85 70 87 87 61 76 63 74 78 79 68 75 56 74 75 72 70 60 74 69 70 74 85 82 65 76 50 84 74 82 60 82 72 83 These averages taken from various city water main locations, with some actual values slightly higher. and some lower than values shown. 494 CHAPTER 26. SPRAY EQUIPMENT Table 1. Average Maximum Water Main Temperature3 (Concluded) State Citt Temp. F State Crrr Tekp. F p? Altoona.-................... Philadelphia;______ Pittsburgh.......;........ PI Providence............... k"c Greenville--.............. Si_Dak. ... Knoxville................ Nashville................... Amarillo.................... Austin--.... ................ Beaumont. ......... Wichita Falls.--____ 82 85 60 64 74 75 74 82 83 67 68 80 81 78 55 84 89 70 90: 65 90 86 86 84 90 84 83 76 '85 Utah.......... Va.............. Wash......... Tacoma. W. Va.. ... Wis...;......... ............... 44 60 75 73 80 58 62 51 57 85 78 78 54 58 70 68 Province Alta............ B. C........... Ont............. P. E. I....... Que--------... Quebec....................... 64 60 50 63 48 78 68 These averages taken from various'dty water main locations, with some actual values slightly higher and some lower than values shown. or where the water available contains dissolved salts which would form scale on the heat-exchanging apparatus, it is necessary to recirculate the water, and to cool it after each passage through the heat-exchanger by exposure to air in an atmospheric water cooling apparatus. Air has a capacity for absorbing heat from water when the wet-bulb temperature of the air is lower than the temperature of the water with which it is in contact. The rapidity with which this transfer of heat occurs depends upon (1) the area of water in contact with the air, (2) the relative velocity of the air and water, and (3) the difference between the wet-bulb temperature of the air and the temperature of the water. Because the changes in rate do not occur in direct proportion to changes in the govern ing factors, data on the performance of atmospheric water cooling equip ment are largely empirical. As the heat content of the air increases, its wet-bulb temperature rises. (See Chapter 1.) Because it is impractical to leave the air in contact with water for a long enough time to permit the wet-bulb temperature of the air and the temperature of the water to reach equilibrium, atmos pheric water cooling equipment aims to circulate only enough air to cool the water to the desired temperature with the least possible expenditure of power. In an air washer, humidifier or dehumidifier, the air is first conditioned 495