Document 4v7Kodz8RkB22VkrYn0zmd39G

American Society of Heating and Ventilating Engineers Guide, 1930 Table 3. Degree-Days for Cities in the United States and Canada Col. A State Col. B City Col. C Degree-Days Col. A State Col. B City Col. C Degree-Days Ala............ Mobile. ................... Birmingham............. Ariz.......... Phoenix. ................. Flagstaff.................... Ark............ Hot Springs.............. Little Rock............... Cal............ San Francisco........... Los Angeles.............. Colo.......... Denver....................... Grand Junction....... Conn.;....... New Haven............... D. C........ Washington.............. Fla............. Jacksonville.............. Ga............. Atlanta....................... Idaho........ Lewiston.................... Pocatello.................... in............... Chicago..................... Springfield.................. Ind..... ....... Indianapolis.............. Evansville.................. Iowa.......... Dubuque.^ ................ Des Moines................ Kans......... Topeka........................ Dodge City..... .......... Ky............. La.............. New OrleansTM........... Shreveport................. Me............ Eastport................... Portland.......... ,,......... Md............. Baltimore................. Mass.......... Mich......... Detroit...................... Marquette.................. Minn......... Duluth........................ Minneapolis............... Miss.......... Mo............. Springfield.................. Mont......... Havre........................... Nebr........ North Platte.........:... 1,439 2,527 1,446 10,913 2,665 2'861 3,450 L517 5,880 5,570 6,039 4^562 L080 2,880 1,517 4'924 6,459 6,007 5,495 5,331 3'355 6,744 6,464 5,282 5|035 4,366 L044 2,097 8,676 7,267 4,591 6,055 8^319 6^202 8,866 9,650 7,953 1,920 5|289 4,583 4,650 6,983 8|608 6,231 6,479 N. H. .. N. J. N. V. N. M___ N. C. N. D. Okla. Pa. R. I..!...... S. C........... S. D.... ...... Utah.......... vt...._ Va.............. Wash......... W. Va..... Wis............ Wyo.......... 6,069 6,266 7'335 5,250 6^542 6,750 5 303 6,064 3 287 2,493 8 498 9 724 6 096 5 426 3 827 4 449 4 629 4 950 5 327 6 111 1 770 2 600 7 213 7 683 3,517 3 550 1 912 1,050 1 362 5 358 6 750 8 123 3 789 3849 3,316 5jl56 6]085 5 813 4884 8 201 7,309 7 366 8 113 7,360 Col. A Province Col. B City Col. C Degree-Days Col. A Province Col. .2? City Col. C Degree-Days B. C.,,____ Victoria..................... Vancouver................. Kamloops.................. Alb.......,.... Medicine Hat........... Sask._....... QuAppelle. .............. Man.......... Winnipeg................... Oht........... Port Arthur.............. 5,777 5,976 6,724 8,152 11,261 11,166 10,803 Ont............ Toronto...................... Que........... Montreal. .............. Quebec...;............ ...... N. B......... Frederickton............. N. S......... Yarmouth.................. P.E. I....... Charlottetown.......... 7,732 8,705 8,628 9,099 7,694 8,485 222 Chapter 11--Heating by Gas that should be considered in addition to the bare fuel costs. Rental value of the floor space occupied by the boiler installation and of the space required for fuel and ash storage, may have a strong bearing on the true cost of heating. When gas is burned the added feature of cleanliness resulting from the elimination of coal delivery and ash removal may add materially to the attractiveness of the building. It is difficult to evaluate the reduced necessity for redecoration when gas is used, because the frequent changes in tenancy encountered in this class of building always necessitate redecoration. There are many cases however, where this factor has a tangible value. Table 4. Gas Requirements for Large Buildings Steam Radiation 1,000 2,000 3,000 4,000 5,000 6,000 7,000 8,000 9,000 10,000 L1,000 12,000 13,000 14,000 15,000 20,000 B.t.u. peb Square Foot. PER DeGREB-DaT 114.5 110.0 107.0 105.0 104.0 102.0 100.5 99.0 97.5 96.0 94.5 92.7 91.0 89.5 88.0 80.5 The supervision of a gas-heated plant is reduced to a minimum. The methods of control produce a uniform temperature at all times, with the minimum requirements of making sure that the pilots are operating and that the temperature controls are set at the proper joint. It is often possible to eliminate on many engineers and coal-passers, substituting therefor about a half-hour's supervision of a building supervisor or porter. Gas companies generally provide necessary engineering attention to the installations, such as periodic inspections; which include cleaning, wash ing down and adjustment of controls and burners. Gas-fired installations for heating larger buildings are controlled by the usual methods, or by the application of distinctive gas methods designed to prevent sudden large demands on the services at the instant when the boilers are called upon for heat. Where a battery of boilers is installed, magnetic valves bleeding gas from the tops of unbalanced snap-action diaphragm valves may be employed under the control of an intermittent timing device or of a conventional type of thermostat. By drilling" the bleed orifice on each of the boilers of a different size, the boilers will come on at intervals, depending on the size of-the bleed orifice. In this way the full demand.is not allowed to come on the meters or gas service instantaneously and full-line pressure is available for each of the boilers 223