Document 9JwDvoxYo6vNx59Lq06mKGjKL

424 CHAPTER 20 1949 Guide Table 1. Average Monthly and' Yearly Degree-Days for Cities in the United States, Canada and Newfoundland a (Concluded) State Station . Years Pa-__ Erie 98/99-45/46 Harrisburg____ l 98/99-45/46 PFlhtfialahdnerlgphh.ia....._. 98/99-45/46 98/99-45/46 Heading , _____ 12/13-45/46 if. i._- Scranton______ Block Island____ 00/01-45/46 98/99-45/46 S. C_ PNraorrvaidgaenrwsett Pier. Charleston., CohtmbiA 98/99-17/18 04/05-45/46 98/99-45/46 98/99-45/46 Doe West 21/22-31/32 S.DTM. HGureroennville____ A 17/18-45/46 98/99-45/46 No. of Sea sons July Aug. Sept. Oct Nov Dec Jan Feb. Mar Apr May June Yearly Total 48 48 48; 48 34. 46 48 20 42 48 48 11 29 8 17 101 367 692 1049 1159 1105 922 591 284 68 6363 1 6 67 314 637 9SK 107; 97; 757 425 146 2; 5412 < : 36 235 544 S& 96: 881 685 371 115 17 4739 ,i 6 : 69 5 69 2: 117 322 651 98; 104; 9ft 751 444 166 30! 606 9.5; 1031 925 736 42; 144 40( 717 107< 1162 1071 862 523 213 29 2c 51 5430 5232 1( ] li 79 26 121 31! 596 919 1030 984 875 366 691 ion 111! 1074 916 618 354 108 622 342 113 5897 6397 6 ( 16 ( 101 1 35! 668 um 1106 1021 847 41 225 421 452 334 239 531 231 83 7 0 5984 1866 C ( 6 95 327 56( 561 48; 305 126 1! 1 2488 ( C ( 1 9 13 141 393 121 410 5SM 651 491 411 65( 684 551 403 15! 179 39 40 2 2890 1 3059 48 10 20 159 502 962 1409 1572 1353 1039 573 271 70 7940 Rapid City_____ 42/43-15/46 98/99-45/46 Chattanooga_TM. Knoxville-----__A Memphis.... A Nashville........ 98/99-45/46 98/99-45/46 98/99-45/46 98/99-45/46 Abilene_______A 98/99-45/46 Amarillo K Austin...... ..........A 98/99-45/46 26/27-45/46 Brownsville___ Jl Corpus Chmti.__ Dart** a Dei Rift 08/09-45/46 98/99-45/46 13/14-45/46 05/06-45/46 El Paso.. ...... A 93/99-45/46 Port Worth....._A Galveston____ _ Houston............. Palestine ....... 98/99-45/46 98/99-45/46 09/10-45/46 98/99-45/46 Point Arthur___ 17/18-45/46 San Antonio___A 98/99-45/46 Utah',, laylor.... Modena._ 01/02-40/41 00/01-45/46 Salt Lake City__ 98/9945/46 Burlington_____ 06/0745/46 Northneld.. .... 98/9942/43 Cape Henry-__ 98/9945/46 Lynchburg.____A 98/9945/46 Norfolk . .. Richmond__ ___ 98/9945/46 98/9945/46 Wash.. Wytheville North Head Seattle----j____ 02/03-40/41 02/0345/46 98/9945/46 STtptiovkimane______A 98/9945/46 98/9945/46 Tatoosh IslandTM. Walla Walla 98/9945/46 98/9945/46 * . Yakima........... . 09/1045/46 Elkins .. A 98/9945/46 Parkersburg____ 98/9945/46 Green Bay____ 98/9940/41 LU&urCfiornm*i 98/994S/46 04/0545/46 ' Wyo_ - ,. Milwaukee!TMTMTM Wausau--__ CTjnhedywenne... A 98/9945/46 15/1640/41 98/9945/46' 98/9945/46 YellowstonePark. 04/0540/41' 47 48 48 48 48 48 4848 20 38 48 33 41 48 48 48 37 48 29 48 40 46 48 40 45 48 48 48 48 39 44 48 48 48 48 48 37 48 . 48 48 48 42 48 26 48 48 37 4 11 136 438 887 1317 1460 1253 97! 516 238 52 7283 15 2! 192 495 842 1171 128C 114( 981 59! 33$ 10$ 7197 ( ( 13 15C 432 691 711 604 412 185 3$ 1 3238 C ( 20 189 498 756 774 666 470 226 3 3658 C ( 14 126 387 67C 716 60C 386 151 33 1 3090 C ( 20 17C 469 74! 78! 675 467 21! 3 5613 (] 0 10 96 332 602 615 483 296 110 23 1 2573 2 42 221 548 854 861 715 546 284 107 11 4196 0 2 31 227 41C 45f 315 185 46 5 t. 1679 C ( 0 8 65 176 191 111 65 11 1 0 628 G ( 0 11 102 255 282 204 93 17 1 0 965 0 C 6 7C 293 574 60C 437 281 91 15 G 2367 0 C 2 35 203 413 413 262 139 31 3 C 1501 G ( 6 88 366 615 615 432 291 104 14 2532 0 0 0 ( C C 5 01 79 285 553 586 463 270 14 123 29G 334 255 130 27 160 331 361 247 150 97 27 16j 36 1 1 2355 G 1174 0 1315 0 C 4 67 261 496 512 401 236 80 11 0 2068 0 G 1 27 177 328 375 254 151 37 2 0 1352 0 0 1 31 171 366 390 287 148 37 4 0 1435 0 C 2 56 234 462 494 375 214 64 8 0 1909 6 11 156 499 832 114? 1190 944 816 567 338 97 6598 3 5 98 23 51 209 62 112 283 00 7 371 712 1033 1093 871 716 530 870 1313 1467 1338 1111 602 947 1389 1524 1384 1176 125 398 731 682 526 446 236 66 694 339 106 754 405 166 301 86 6 5650 8051 8804 3538 l 2 37 230 $21 799 829 732 537 287 81 17 4068 0 0 7 C] 9 . 27 13 82 129 392 668 712 650 483 254 62 196 486 3.5? 662 780 814 722 538 916 945 836 677 278 72 410 168 S 8 35 3364 3922 5103 251 229 255 350 491 642 697 597 610 505 428 312 5367 67 69 170 365 554 704 759 637 595 436 299 160 4815 20 37 184 480 817 1061 1139 931 756 490 285 118 6318 71 75 190 390 581 737 786 6SR 612 313 171 S039 301 295 325 421 534 654 716 627 643 537 454 350 5857 5 10 90 315 662 910 981 770 571 354 186 56 4910 8 17 124 595 778 1050 1125 837 624 374 193 60 5585 15 1 23 115 3 56 403 286 722 617 1003 1033 930 977 89487? 763 660 489 229 369 129 58 18 5800 4928 17 38 179 494 889 1329 1493 1329 1087 658 327 91 7951 7 22 157 454 864 1339 1492 1281 990 531 232 52 7421 8 20 145 452 857 1296 1451 1246 1002 588 274 66 7405 13 17 124 411 786 1203 1329 1177 959 617 341 1C2 7079 26 58 216 568 982 1427 1594 1381 1147 680 315 100 8494 40 27 46 251 43 265 587 623 1807216 1144 1400 1187 1427 1064 1197 996 1006 720 460 165 669 410 155 7536 8243 125 173 424 759 1079 1386 1464 1252 1165 841 603 334 9605 AltaTM. CaJprir B.CTM. 9.650 5^573 l,06i N.B Raint. Jnhn N.S^ Ont. - 1271 1417 1266 1132 792 505 261 8^578 WtndoAr PAL. P. 0-- Mnnti-ml Y.T_ Dawson.-. 14A3 17* 43 276 651 1050 1534 1696 1481 1311 849 428 102 9,m 167 322 687 1209 1908 2440 2666 2159 1879 1092 580 246 15JS5 Estimating Fuel Consumption for Space Heating 425 Values of N depend on the particular building for-which-the.estimate is 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 and are obtained as a result of the collection of operating information. Certain of this information is presented later, but before referring to these data attention is directed to the nature of the unit. 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 square foot of radiation, cubic foot of heated building space, or 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 uh-' heated. In the absence of data on net heated volume a figure of 80 per cent of the gross volume may be used to obtain the estimated net heatedi volume. The volume basis has been rather widely used primarily because., of its facility in application. In industrial buildings it is usually easier to obtain 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, and type of occupancy. It is considered inaccurate! for purposes of estimating fuel consumption unless the buildings are of very similar nature. . . . . The calculated heat loss or its equivalent square feet of calculated radia-; tor surface may. be used as the unit. The use of the unit equivalent direct; radiation is of questionable value when referring to heat transfer surfacesused 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 unit equivalent direct radiation basis for estimating,. since; actual in-, stalled radiation may differ considerably from the exact radiation require ments. In 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 prob ably the most desirable, although the one most widely used seems to be units offuel per degree-day per square foot of equivalent direct radiator surface. The equivalent heating load for the hot water supply is not included in the latter unit, but it generally includes the piping load. Since this unit is the one most widely used at present the unit fuel con-" sumptions given in succeeding paragraphs of this chapter make use of this unit to a considerable extent, although it should be understood that most of these units of consumption can be transposed as desired. Estimating Gas Consumption Values of the Unit Fuel Consumption Constant ( U) for gas are given in. Table 2 for various gas heating values, and different- types and sizes- of. heating plants. They are based on an inside design temperature of 70 F . and an outside design temperature of 0 F, and apply only to these condi-