. Power, heating and ventilation ... a treatise for designing and constructing engineers, architects and students. the occupied rooms. While a system of indirect steam is more expensive to installthan a hot-air furnace the cost of operation is practically thesame for an equal amount of ventilation. A considerable savingin fuel is often made by using direct radiation in certain unim-portant rooms, where heat only is required, but this is usuallyoffset by the more generous ventilation provided in other partsof the building. 106 INDIRECT STEAM HEATING 107 Types of Radiating Surface. Cast-iron Rad
. Power, heating and ventilation ... a treatise for designing and constructing engineers, architects and students. the occupied rooms. While a system of indirect steam is more expensive to installthan a hot-air furnace the cost of operation is practically thesame for an equal amount of ventilation. A considerable savingin fuel is often made by using direct radiation in certain unim-portant rooms, where heat only is required, but this is usuallyoffset by the more generous ventilation provided in other partsof the building. 106 INDIRECT STEAM HEATING 107 Types of Radiating Surface. Cast-iron Radiators.—Indirect steam radiators are made ofcast iron in many different patterns, the most common being thepin radiator, one form of which is shown in Fig. 71. They aremade in sections or slabs, and a sufficient number of these areconnected together to form a heater or stack, having the requiredamount of heating surface. An efficient form of radiator that is especially adapted to thewarming of large bodies of air, as in schoolhouses and similarwork, is shown in Fig. 7i3. This radiator as well as Fig. 71 can. Fig. 71. Pin Radiator. be used for either steam or hot water, there being a continuouspassage downward from the supply connection at the top to thereturn at the bottom. The sections are made up in stacks similarto Fig. 71, except nipples are used instead of bolts. Fig. 73 shows another form in which the extended surfacesare made up of fins or blades instead of pins. The standard pinradiator, rated at 10 square feet of heating surface per section, isprobably as well adapted to house heating as any. The sectionsare usually made from 36 to 40 inches in length, 7 to 8 inchesin depth and ,3% to 33^ inches in thickness, although these di-mensions may vary somewhat in different makes. The free airspace between the sections is about 36 square inches. The School Pin shown in Fig. 73 is made in two sizes, rated at15 and 30 square feet of surface respectively; they are each 36 108 H
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectventilation, bookyear
