Document 1XEzkVYaDyJ8J01jJ2EyrkZj

American Society of Heating and Ventilating Engineers Guide, 1929 of floor area, while a charwoman (working five hours per day) is expected to keep clean 3000 sq. ft. The average cost per square foot of net floor area for all items of maintenance and operation, both material and labor (except repairs), is about 25 cents in the new buildings and 30 cents in buildings of the older and more antiquated type. The average cost of fuel and labor to heat the buildings, using bitu minous coal (at approximately $5.33 per ton) is cent per cubic foot per annum. Table 4. Yearly Costs of Repairs to the Mechanical Equipment in 1400 U. S. Treasury Department Buildings Plumbing repairs, including new brass water piping......................................... 2148,753 Heating and ventilating apparatus. .................................................................. 250,171 Elevator repairs and new elevators......... .............................................................. 102,221 Conduit and wiring................ ................................................................................... 46,890 Pneumatic tubes.................................................................................:...............1...... 1,965 2550,000 An analysis of all the Federal Buildings for which steam is purchased shows that north of Richmond, Va., approximately 5 lb. of steam is used per cubic foot per season for heating the.buildings. This, of course, varies widely due to local conditions, winds, building construction, manner of operation, etc. In fact, in the north we will get, in the same t State, variations running from 3 lb. of steam per cubic foot for one building to 7 lb. for another building. Generally-speaking, an isolated electric generating plant begins to be feasible in a Federal Building when the full connected load is 150 k.w. or more, the annual current consumption 200,000 k.w.h. or more and * Table 5. Yearly Costs of Operating Supplies for 1400 Uj S. Treasury Department Buildings 136,871 tons of bituminous coal, at an average cost of 25.33 delivered in the bunkers___ :.................................................................. ................................. 23,100 barrels of fuel oil, at an average cost of 21.42 per barrel delivered , at building........... .............................................. ................................................. Central Station Steam 294,625 thousand pounds......... .................. ....:............ Natural gas for use as fuel in heating boilers, 97,777,000 cu. ft. at an average cost of 34.8 cents per thousand cubic feet................................... -................ (It is found that 25,000 cu. ft. of natural gas is equivalent to one ton of good bituminous coal, and that on the average 6M cu. ft. of natural gas is burned per cubic foot of building content.) Water for . these buildings (average water consumption 25 gal. daily per . employees, except in marine hospitals, where it runs up to 200 gal. daily) Electric light bulbs.................................................................................................... (Approximately one new electric light bulb is required for each electric light socket in the building per annum. The light is used on an average in all these buildings about 1500 hours per annum.) Electricity for light and power for all purposes 26,800,000 k.w.h., at an ! average cost of 4.07 cents-.............................................................................. ... Oil, waste, engineers' supplies, ice, soap, brooms, janitor's supplies, etc......... $730,010 32,802 256,876 34,000 200,000 72,114 1,090,828 594,870 $3,011,500 354 Chap! XXII--Design and Operating Data, Mech. Equip., U.S. Treas. Dept. Bldgs. Table 6. Yearly Costs of Repairs to the 1400 Buildings under the Control of the U. S. Treasury Department Building Repairs Remodeling, Painting, Etc. New Vaults and Repairs to Old Ones , New Furniture, Furniture Repairs, Carpets, Lighting Fixtures, Etc. $930,000.00 $100,000.00 $775,000.00 Table 7. ISOLATED ELECTRIC PLANTS Data Relating to Isolated Electric Generating Plant U. S. Treasury Department Buildings Pounds of steam figured per square foot of direct radiation per year, north of Richmond, Va.................... ........................ Pounds of steam figured per cubic foot of net heated contents of building................... Equivalent of 1 ton (2000 lb.) of run of mine bituminous coal................................ Kilowatt-hour per day for elevators. Steam for heating domestic hot water........ Kilowatt-hours per year of electric current for all purposes per square foot of total floor area..................................................... 500 5 4 bbls. fuel oil 25,000 cu. ft. of natural gas. Average 5 k.w.h. per car mile. Car miles per day in small buildings 5 and in large buildings 10 miles a day per elevator is the average. 10 per cent of steam used for heating. 24 hour large buildings with Post Office, 2.5 8 hour large buildings without Post Office, 1.5 24 hour smaller buildings, 0.8 the cost of current from the central plant four cents per kilowatt-hour or more. In. arriving at the monthly consumption of steam the following table is used: October.____ November.... December-:January-..... February..... March--..... April............. May........ 6% 10% 18% 18% 18% 15% 10% 5% The average demand for steam per hour for heating and ventilating equals the annual consumption divided by. 5000 ((he number of hours in the average heating season). The maximum demand for steam per hour for heating and ventilating is two and one-half times the average demand. This maximum demand figure divided by 30 gives the maximum boiler. horsepower. If the heating surface is known, the fan blast coils are reduced to the 355. X