Document MJLrzLOryYQD1p8pnmGyEoVDj

466 CHAPTER 18 1957 Guide Table 2. Average Monthly and Yearly Degree-Days for Cities in the United States and Canada*' b' (Concluded) State or INCE Station No. > toYears op Sea- >j d _ fi > o SONS *< GQ o !4 Q -> n< S< > a z *erh S l-s > Texas- Utah.. Vt........ Va..... Wash.. C A C A 01/02-40/41 00/01-45/46 .A .C .A 98/90-42/43 C Lynchburg......... .A .A .C ..Ac 02/03-40/41 .c .A .Ac .c n 40 46 45 39 cW. Va.. A Parkersburg___ Wis... . . Green Bay........ A A c c 15/16-40/41 Wyo... Cheyenne.......... .A 26 Yellowstone Park. 04/05-40/41 37 0 0 0 45 260 440 531 368 265 71 0 0 1980 0 0 0 20 218 349 406 274 211 39 0 0 1517 0 0 0 8 170 315 381 258 181 27 0 0 1340 0 0 0 . 25 201 374 462 293 190 34 0 0 1579 0 0 2 56 234 462 494 375 214 64 8 0 1909 6 11 156 499 832 1142 1190 944 816 567 338 97 659S 0 0 88 381 771 1039 1194 885 741 453 233 81 5866 0 0 61 330 714 995 1119 857 701 414 208 64 5463 19 47 172 521 858 1308 1460 1313 1107 681 307 72 7865 62 112 283 602 947 1389 1524 1384 1176 754 405 166 8804 0 0 0 120 366 648 698 636 512 267 60 0 3307 0 .0 49 236 Ml 809 846 722 584 289 82 5 4153 0 0 9 152 408 688 729 644 500 265 59 0 3454 0 0 5 118 354 636 679 602 464 220 41 0 3119 0 0 33 210 498 791 828 708 550 271 66 0 3955 0 0 31 181 456 750 787 675 529 254 57 0 3720 7 13 82 352 662 916 945 830 677 410 168 35 5103 239 205 234 341 486 636 704 585 598 492 406 285 5211 49 45 134 329 540 679 753 602 558 396 246 107 4438 75 70 192 412 633 781 862 676 636 477 307 155 5275 17 28 205 508 879 1113 1243 988 834 561 330 146 6852 66 62 177 375 579 719 797 638 595 435 282 143 4866 295 288 315 406 528 648 713 610 629 525 437 330 5724 0 0 93 308 675 890 1023 748 564 338 171 38 4848 0 9 0 7 150 446 807 1066 1181 862 660 408 205 31 0 122 56 412 272 726 600 995 1017 896 m 919 826 797 672 477 347 224 119 53 5845 53 5773 13 4750 32 58 183 515 945 1392 1518 1336 1132 696 347 107 8259 11 13 10 20 152 447 921 1380 1528 1289 1035 552 250 31 150 459 891 1302 1423 1207 1008 579 272 30 137 419 864 1287 1417 1207 1011 573 266 74 7650 82 7417 79 7300 20 11 32 24 134 112 428 397 831 1218 1336 1142 795 1184 1302 1117 983 961 621 606 351 335 109 100 6944 26 33 7 125 58 216 39 241 23 244 173 424 568 982 1427 1594 1381 1147 680 577 897 1125 1225 1044 1029 717 632 1050 1383 1494 1179 1045 687 759 1079 1386 1464 1252 1165 841 315 462 396 603 173 7562 163 8303 96U& Alta... Man.. . N.B... Nfld... 1921-50 1921-60 1921-50 1921-50 1921-50 1921-50 1921-45 1921-50 1921-50 1926-50 1921-50 1921-50 1930-60 1921-50 1933-50 1937-60 1941-51 NWT.. 1926-50 N.S-- C,,Jnn,, Oat.... Fnrt William P.E.I. Charlottetown.... Que.... Saaks . Prince Albert........ Y.T.... DawBon.............. 1921-50 1921-50 1921-50 1921-50 1921-50 1921-50 1921-50 1921-50 1921-50 1921-50 1931-50 1921-50 1921-50 1921-50 1921-50 1921-50 1921-50 1921-50 1921-50 30 30 30 30 30 30 25 30 30 noo25 30 30 12 no no30 18 14 10 19 25 25 30 30 no30 30 21 no30 30 30 30 30 30 no20 30 30 30 30 no30 30 30 30 110 90 60 20 180 170 180 100 50 220 410 440 350 300 440 710 1110 1430 1530 1350 1200 750 1220 1660 1780 1520 1290 620 1030 1330 1450 1290 1120 600 1070 1440 1590 1380 1130 730 1100 1450 1560 1290 1070 770 760 690 620 730 460 410 400 320 470 270 9520 220 10320 210 8650 130 9500 270 60 160 50 310 40 50 40 90 130 130 170 280 170 50 60 90 10 30 20 30 20 40 60 10 20 20 70 70 60 50 170 240 60 150 100 370 70 70 80 140 160 220 160 460 350 70 80 120 120 10 170 40 40 60 30 60 40 70 70 140 110 90 320 340 510 680 860 910 810 790 650 MJ0 200 410 620 790 850 710 650 460 290 230 410 600 730 80C 660 620 470 350 350 730 1290 1810 20IC 1730 1440 820 420 650 1110 1750 2300 2520 2270 2150 1590 300 690 1250 1770 2000 1710 1440 810 400 250 600 940 1410 157(1 1410 1180 780 420 240 580 890 1340 1510 1340 1180 830 460 250 530 830 1250 1400 1270 1100 780 500 320 640 890 1230 1410 1360 1240 900 640 320 660 920 1230 143C 1320 1270 440 840 1220 1740 2020 1710 1530 1110 770 320 580 820 1100 1270 1230 1160 910 680 800 141)0 2040 2500 258< 700 1220 1940 2460 2551 2310 2280 1690 1050 2190 2040 1390 730 180 220 470 510 740 1120 1260 1180 1050 780 1130 131C 1280 1160 760 850 570 230 480 720 1040 1180 1100 1010 760 510 350 120 690 1140 1590 1780 1550 1360 430 760 1130 1270 1160 1000 890 320 410 780 1270 1780 206( 1770 1570 1030 61)0 160 500 820 1250 1420 1290 1110 710 150 210 140 200 330 490 840 1200 132C 1210 1040 590 960 1480 1640 1480 1230 460 770 1130 1260 1160 1020 510 820 1230 1430 1340 1180 690 1100 1670 1880 1660 1410 65U 730 640 840 880 340 320 610 430 180 530 890 1370 1640 1370 1150 250 610 990 1470 1640 1460 1250 240 590 920 1400 156( 1410 1190 410 780 1350 1870 2060 1760 1500 370 750 1290 1740 1940 1680 1420 380 760 1320 1790 199( 1710 1440 34(1 68C 1170 1550 1710 1490 1260 660 1170 1890 2410 2510 2160 1830 700 810 750 850 790 800 730 400 370 440 420 420 400 570 5230 230 5410 170 10930 690 150 10630 150 210 8700 250 350 8210 9410 410 12140 3S0 8780 17870 280 16020 210 7570 270 270 7520 240 60 240 11790 100 7810 7380 70 7020 170 10440 50 8130 100 90 8610 210 11430 190 10770 180 10960 190 9660 250 18040 Estimating Fuel Consumption for Space Heating 467 being prepared and must be found by surveying plans, by observation, or by measurement of the building. Values of U for use in this equation are the unit fuel consumptions per degree-day, obtained as a result of the collection of operating information and listed in Tables 4, 5 and 6. Atten tion is directed to the nature of these units in the next following sections. Unit Fuel Consumptions per Degree-Day The quantity of fuel used per degree-day in a given heating plant can be reduced to a unit basis in terms of quantity of fuel or steam per degree-day per thousand Btu hourly heat loss at design conditions. A less frequently used basis is quantity of fuel per (degree-day) (square foot of floor area). In fact any convenient unit can be used to relate the consumption to the degree-day and to the building. The choice of these units requires explanation, and some discrimination and judgment. If the volume basis is used, the net heated space is prefer able to the gross building cubage, since gross cubage includes outer walls and certain portions of attic and basement space which are usually un heated. In the absence of data on net heated volume, a figure of 80 per- Table 3. Correction Factors for Outside Design Temperatures* -20 . -10 0 +10 20Outside Design Temp F............................................. Correction Factor........................... 0.778 0.875 1.000 1.167 1.400 * The multipliers la Table 3, which arehigh for mild ftlimuteH aad low for cold regions, are not in error as might appear. The unit figures in Tables 4, 5, and 6 are per square foot of radiator or thousand Btu heat loss per degree-day. For equivalent buildings and heating seasons, those in warm rfimates have lower de sign heat losses and smaller radiator quantities than those.in cold cities. Consequently, the unti figure in quantity of fuel per (square foot of radiator) (degree-day), is larger for warm localities than for colder regions, cmoe the northern cities have more radiator surface per given building and a higher seasonal degree-day total than cities in the south, the total fuel per season will be larger for the northern city. cent of the gross volume may be used to obtain the estimated net heated volume. The volume basis has been rather widely used primarily because it is simple to apply. In industrial buildings it is usually easier to ob tain the correct volume of a given building than to measure and evaluate the heating capacity of its heating system, or calculate its maximum hourly Btu loss. The comparison of buildings on a straight volume basis does not allow for variation in exposure, type of construction, ratio of exposed area to cubical contents, aad type of occupancy. It is inaccurate for estimating purposes unless the buildings are of very similar nature. The calculated heat loss or the heating capacity of the installed radiation aiay be used as the unit. The use of the heating capacity of the installed radiation is of questionable value when referring to heat transfer surfaces used in warm air furnace or central air conditioning systems. Where steam or hot water radiation is already installed, care should be exercised in using the installed radiation as the basis for estimating, since actual installed radiation may differ considerably from the exact radiation requirements, o view of all these considerations, it is believed' that the unit based on thousands of Btu of hourly calculated heat loss for the design hour is probably the most desirable. Estimating Gas Consumption Values f the Unit Fuel Consumption Constant (U) for gas are given in ole 4 for various gas heating values, and different types and sizes of