Document 3Jg38obeKRBxbERg17GdLDY03

American Society of Heating and Ventilating Engineers Guide, 1929 makers of air sealed tank in basement equipment furnish tank sizes for the different amounts of radiation as follows: Square Feet of Radiation 250 to 350......... 350 to 450......... 450 to 650......... 650 to 900......... 900 to 1100..... 1100 to 1400......... Gallons ... 18 .... 21 .... 24 .... 30 ... 35 ... 40 Square Feet of Radiation Gallons 1400 to 1600...................................... 54 1600 to 1800...................................... 60 1800 to 2000............................ 70 2000 to 2400..................................... 80 2400 to 2800...................................... 90 2800 to 3000... ............................ ... 110 3000 to 3500........... .......................... 120 By using the sealed system of hot-water heating it has been found that there is a ready absorption of heat by the water, a rapid circulation and uniform distribution of the water in the radiator and the possibility of close regulation depending'on the use of the pressure obtained by the expanding water against the air in the sealed tank. The pressures obtained for different temperatures when tank capacities are as outlined are as follows: Outbids Temperature 60 deg. 50 deg. 32 deg. 20 deg. 15 deg. 10 deg. 0 deg. --10 deg. --20 deg. --25 deg. --30 deg. Temperature of Water Required to Heat Building 100 deg. 120 deg. 140 deg. 150 deg. 160 deg. 170 deg. 180 deg. 190 deg. 200 deg: 210 deg. 220 deg. Approximate Position of the Hand on Pressure Gage At the static head required to fill the system. 1 lb. pressure above static head. 2"lb. pressure above static head. 3 lb. pressure above.static head. 4 lb. pressure above static head. 5 lb. pressure above static head. 6 lb. pressure above static head. 7 ib. pressure above static head. 8 lb. pressure above static head. 9 lb. pressure above static head. 10 lb. pressure above static head. The table also gives the outside temperature and the corresponding boiler temperature of the water in the radiators necessary to warm to 70 deg., when radiation is figured on the basis of heating rooms to 70 deg. 132 CHAPTER V HEATING BOILERS Duty of Boiler, Boiler Selection, Boiler Ratines, Types of Boilers, Boiler Troubles, Operating Conditions, Burning Anthracite ana Bituminous Coal, Pick-up Load, Hot Water Supply Boilers. IT is important that the duty of the boiler be clearly understood. The boiler accomplishes its main purpose when a specified quantity of heat in dry steam or hot water is delivered at its outlet. If the boiler is equipped, with automatic temperature or pressure control, this control should actuate dampers or other means for controlling the rate of com bustion within certain limits. When equipped with devices intended to accomplish a certain combustion result, as, for example, to burn bitu minous coal smokelessly, such results should be accomplished without undue attention. Certain conditions affecting the operation of the boiler must be met if it is to accomplish its purpose. The most important of these are as follows: 1 (1) There must be chimney or other means capable of supplying an adequate draft. (2) The fuel used must be as good as that contemplated when the boiler was selected, (3) The quality and frequency of attention must equal that upon which selection was based. (4) The system must be properly designed to quickly return the Water to the boiler after its heat has been delivered to the desired points. (5) Dirt and grease must be kept from the system, leaving reasonably clean water. BOILER SELECTION Ordinarily , especially in residence heating and small installations, the information upon which the boiler is selected is very meager. This infor mation usually consists of: the heat output of radiators under normal temperatures, the kind of fuel, whether anthracite or bituminous coal, oil or gas, and in a few cases the amount of piping. Selection of a boiler upon this information is largely guesswork based upon experience, with the result that the boiler is selected large enough to deliver the required quantity of heat under even the most adverse conditions. Boilers having large output and rapid pick-up are frequently selected in preference to boiler's having more economical performance. A proper heating boiler specification would contain the information given in the following items: 1-Maximum hourly output required during "pick-up" period which is made up of the following items: (a) The heat output of radiators and other heating units when The material for this Chapter was prepared especially for The Guide by the following committee: Carl H.FIink, chairman; A. E. Bastedo, C. E. Bronson, D. S. Jacobus, Alfred Kellogg, P, NichoIIs, O. O. Oaks, C. W. Obert and At L. Sanford.