Cyclopedia of heating, plumbing and sanitation; a complete reference work . neath the beds of growingplants or above, as bottom or top heat is desired. The main is gen-erallv run near the upper part of the greenhouse and to the farthestextremity, in one or more branches, with a pitch upward from theheater for hot water and with a pitch downward for steam. Theprincipal radiating surface is made of parallel lines of 1 \ inch orlarger pipe, placed under the benches and supplied by the returncurrent. Figs. 175, 17, and 177 show a common method of runningthe piping in greenhouse work. Fig. 175 show
Cyclopedia of heating, plumbing and sanitation; a complete reference work . neath the beds of growingplants or above, as bottom or top heat is desired. The main is gen-erallv run near the upper part of the greenhouse and to the farthestextremity, in one or more branches, with a pitch upward from theheater for hot water and with a pitch downward for steam. Theprincipal radiating surface is made of parallel lines of 1 \ inch orlarger pipe, placed under the benches and supplied by the returncurrent. Figs. 175, 17, and 177 show a common method of runningthe piping in greenhouse work. Fig. 175 shows a plan and eleva-tion of the building with its lines of pipe; and Figs. 176 and 177 givedetails of the pipe connections of the outer and inner groups of pipesrespectively. 219 210 HEATING AND VENTILATION Anv system of piping which gives free circulation and which isadapted to the local conditions, should give satisfactory results. Theradiating surface may be computed from the rules already the average greenhouse is composed almost entirely of glass, we. Fig. 175. Plan and Elevation Showing One Method of Running Piping in a Greenhouse may for purposes of calculation consider it such; and if we dividethe total exposed surface by 4, we shall get practically the sameresult as if we assumed a heat loss of 85 B. T. U. per square foot ofsurface per hour, and an efficiency of 330 B. T. U. for the heating 220 HEATING ANT) VENTILATION 211 coils; so that we may say, in general, that the square feet of radiatingsurface required equals the total exposed surface, divided by 4 forsteam coils, and by for hot-water. These results should be in-creased from 10 to 20 per cent for exposed locations. CARE AND MANAGEMENT The care of furnaces, hot-water heaters, and steam boilers hasbeen discussed in connection with the design of these different systemsof heating, and need not be repeated. The management of theheating and ventilating systems in large school buildings is a matterof much
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