Document 82Q53KQOVy0Eyv44kRxeDex15

American Society of Heating and Ventilating Engineers Guide, 1934 Table 1, Summary of Data Applied to Warm Air Research Residence Rooms ii From Chapter 7 Estimating Heat Losses Btu HeatBLosses * Register Size Gross First Floor L--Divivnivinng6g_-_-_-_Breakfast. Kitchen--, Sun________ Hall and stairi Second Floor Owners____ S. W, BedBath______ N. Bed--.... Third Floor E. Bed_____ W. Bed.___1, 17250 6810 2300 9210 25710 12570 15030 9800 2450 14800 8220 8220 14 X 16 8 X 12 8 X 10 12 X 14 Two 12 X 14 12 X 14 12 X 14 8 X 12 8 X 10 12 X 14 8 X 10 8 X 10 b-- o owwst e>r.i\ fi manus ' Booster fans often may be arranged to operate when the gas and oil burners operate and to stop automatically when the burners shut down. The booster equipment is most effective in increasing output at low operating temperatures. According to tests, efficiencies may be advanced from 60 per cent for gravity to 70 per cent with boosters at low operating temperatures, but at high operating temperatures gravity and booster efficiencies are almost identical. See University of Illinois Eng. Exp. Sta. BuJJettn No. 141, 79. 330 Chapter 25 HEATING BOILERS Cast-Iron Boilers, Steel Boilers, Special Heating Boilers, Hot Water Supply Boilers, Furnace Design, Heating Surface, Testing and Rating Codes, Output, Efficiency, Selection of Boilers, Con nections and Fittings, Erection, Operation and Maintenance, Boiler Insulation STEAM and hot water boilers for low pressure heating work are built in a wide variety of types, many of which are illustrated in the Catalog Data Section, and are classified as (1) cast-iron sectional, (2) steel fire tube, (3) steel water tube, and (4) special. CAST-IRON BOILERS Cast-iron boilers may be of round pattern with circular grate and hori zontal pancake sections joined by push nippies and tie rods, or of rec tangular pattern with vertical sections. The latter type may be either of outside header construction where each section is independent of the other and the water and steam connections are made externally through these headers, or assembled with push nipples and tie rods, in which case the water and steam connections are internal. . Cast-iron boilers usually are shipped knocked down to facilitate hand ling at the place of installation where assembly is made. One of the chief advantages of cast-iron boilers is that the separate sections can be taken into or out of basements and other places more or less inaccessible after the building is. constructed. This feature is of importance in making repairs to or replacing a damaged or worn out boiler and should be given consideration in the original selection. Sufficient space should be pro- vided in the boiler room for assembling the boiler and for disassembling it conveniently if repairs are needed. With the outside header type of boiler a damaged section in the middle of the boiler can be removed without disturbing the' other sections and sufficient side clearance should be provided for this contingency. Capacities of cast-iron boilers range from that required for small residences up to about 18,000 sq ft of steam radiation. For larger loads, cast-iron boilers must be installed in multiple or a steel boiler used. In most cases cast-iron boilers are limited to working pressures of 15 lb for steam and 30 lb for water. Special types are built for hot water supply which will withstand higher local water pressures. STEEL BOILERS Two general classifications may be applied to steel boilers `. first, with regard to the relative position of water and hot gases, distinguished as fire 331