Document 84eBr9Jmq52ojKQMM0dn5X1Z

American Society of Heating and Ventilating Engineers Guide, 1935 Table 1. Degree-Days for Cities in the United States and Canada* CoLA State CcLB City ColC Degree*Days Col. a State ColB City Col. C DtgrM-Daj, Ala............. Birmingham.-.......... Mobile ................... Ariz.._........ Flagstaff.................... Tucson....................... Ark Little Rock............... Calif.......:.: Los-Angeles:..:...... /.: San Francisco.......... Colo.....:-- .Colorado Springs__ Denver./....;.... .......... Conn___ :::. * New Haven.............. nc Fin Ga Atlanta...................... Savannah.................. Lewiston................... III Springfield................ InH Indianapolis--........... Sioux City................ Kans..... .:... Dodge City.:............ Topeka...................... Kv Louisville__;............. La..:......--. New Orleans............ 'Me__ Eastport.................... Portland.................... Md.. Baltimore............... Detroit...................... Marquette................ Minn..... _... Duluth-.................... Minneapolis....... Miss__ Vicksburg...;.;...;....... St. Louis................... Mont_____ Billings...................... Havre........................ cr Omaha/1....... 1.......... rj-v. 2,408 1,471 7,145 1,845 2,665 2,811 1,504 3,264 6,553 5,873 5,895 . 4,626 896 2,891 1,490 4,558 4,924 6,315 5,370 4,164 5,297 6,373 7,023 5,034 5,301 4,616 4,180 1,023 8,531 7,012 4,333 6,464 6445 6|494 8;692 9,480 7,851 1,822 5,202 4,585 7,1158,699 6,231 6,128 Nev.......... Reno........ ...........,__ 5,891 N. H......... Concord.................... N. J........ Atlantic City........... Trenton..................... 6,852 5,175 4,934 N. M........ Santa Fe................... 6,063 N. Y......... Albany...................... 6,889 Buffalo________ ___. "6,821" New York................. 5.348 N. C.... Raleigh.... :................ 3.234 Wilmington.............. 2,302 N. Dak. Bismarck.:................ 8,498 Ohio...... Cincinnati............... 4,702 Cleveland.................. 6,154 Columbus.................. 5,323 Okla.......... Oklahoma City...:'... 3,613 Ore...... ...... Portland.................... 4,468 Salem....................... 4,629 Pa...........1. Philadelphia----Pittsburgh......... . 4,855 5.235 R. I........... Providence...... ......... 6,014 . S. C...._ Charleston............. 1,769 Spartanburg............. 3,257 S. Dak..--. Sioux Falls............... 7,683 Tenn......... Memphis___:............ 2,950 Nashville.:................ 3.578 Texas....... Austin...... ................. 1.578 Dallas........................ 2,455 Houston.................... 1,157 San Antonio............. 1,202 Utah-- Logan........................ 6,735 Salt Lake City.--.... 5,553 Vt....... Burlington................ 7,620 Va....... Fredencksburg........ 4,243 ^Norfolk.... ................. 3.349 Richmond.:.............. 3,725 Wash___ .;. Seattle.--....... -- 4,868 Spokane........'..... ...... 6,353 W. Va...... Morgantown..:......... 5,016 Parkersburg:....... . 4,884 Wis........... Fond du Lac........ 7,612 Green Bay................ 7,823 La Crosse.................. 6,690 Milwaukee............ 7,372 Wyo_____ Cheyenne..... ............ 7,462 Province City Degree*DayB Province City ' r Degree^Days ;B> C_____ Kamloops....... .......... Atb:s:'l 'Medicind Hat........ Sask:.//// Ou'Aooelle___........ 'Man.'./u-/:. Winnipeg.. 'Ont.---i.-ff Port Arthur//..... ./. 5,777 5,976 6,724 8,152 11,261 11,166 10,803 Quebec...................... N: B...:..... Fredericton..--...:./:... N: S.:--.... Yarmouth..._;...... P. E. I....... Charlottetown..... 7,732 8,705 8,628 ' 9,099 7,694 8,485- -- From Industrial Gas Series. House. Heating (third edition) published by the American Gas Association. TK^degrti^ayS areTrased on diUy inean temperatures. Ease;-65 F. 484 Chapter 29--Fuel Utilization building is to be heated with oil fuel having a calorific value of 141,000 Btu per gallon. .The heating efficiency is assumed to be 70 per cent. Thermostatic control is to be used and a temperature of 55 F is to be maintained from 11 p.m. to 7 a.m. How many gallons of oil will be required during a normal heating season if the loss of heat through open windows is neglected? oo 000 Solution. The maximum hourly heat loss will be 127,000 -- --= 113,000 Btu _ {J. Substituting the proper values in Equation 1: 113.000 X (70 - 36.4) X 5040 141.000 X 0.70 X [70 - (- 8)] 2486 gal of oil. The average inside temperature will be 70 X 16 V 55 X 8 24 65,F and the fuel saving due to this fact will be 70 - 65 70 - 36.4 0.149 or 14.9 per cent. Hence, the net fuel consumption will be 2486 -- 0.149 X 2486 = 2116 gal. The normal number of degree-days for Chicago is 6315. 'Substituting in Equation 3 and solving by the degree-day method: 113,000 X 6315 X 24 78 X 141,000 X 0.70 2225 gal of oil No allowance need be made for the average temperature of 65 F since this is taken care of by the selection of a base of 65 F for the degree-day, as already explained/ It will be noted that the two methods check within 5 per cent in this case. If the average daily inside temperature in the first solution had been 66.4 F instead of 65 F, the two methods would-have checked exactly. . INDUSTRIAL DEGREE-DAY --------------- Since the standard degree-day is intended for an inside temperature of 70 F, it is particularly convenient for solving residence problems. Where the design temperature differs greatly from 70 F, the standard degree-day cannot be accurately applied. Consequently, the industrial degree-day4 has been developed and values have been derived for two bases, namely 55 F and 45 F, intended for inside temperatures of 60 F.and 50 .F, re spectively. ' ' ' There is a considerable spread, however, among these three bases, and consequently there would be an appreciable error if the actual basis to be used in a. certain case would be approximately midway between any two of the three bases for which degree-day values are at present available. Since the correction cannot be made on a proportionate basis, it would be more accurate in the majority of cases involving inside temperatures other than 70 F, 60 F, or 50 F to apply Equation 1. APPROXIMATING FUEL REQUIREMENTS It is sometimes desirable to obtain a rough approximation of the annual fuel consumption. Such approximations may be obtained by using unit factors based on the fuel requirements per square foot (or per 100 sq ft) of radiation or per 1000 cu ft of space. Fig. 1 may be used for rough approximations of coal and oil require- Heating and Ventilating Degree-Day Handbook. 485