Cyclopedia of heating, plumbing and sanitation; a complete reference work . ind .the size of blower, engine, and heater for a factory200 feet long, 60 feet wide, and having 4 stories, each 10 feet high,using live steam at 80 pounds pressure in the heater, and changingthe air every 20 minutes by taking in cold air from out of doors. 6-foot { 13 H. P. engine. 3,200 feet of pipe. 192 HEATING AND VENTILATION 183 In usingthis method of computation, judgment must be employed, which can conic only from experience. The figures given are foraverage conditions of construction and exposure. D
Cyclopedia of heating, plumbing and sanitation; a complete reference work . ind .the size of blower, engine, and heater for a factory200 feet long, 60 feet wide, and having 4 stories, each 10 feet high,using live steam at 80 pounds pressure in the heater, and changingthe air every 20 minutes by taking in cold air from out of doors. 6-foot { 13 H. P. engine. 3,200 feet of pipe. 192 HEATING AND VENTILATION 183 In usingthis method of computation, judgment must be employed, which can conic only from experience. The figures given are foraverage conditions of construction and exposure. Double=Duct System. The varying exposures of the rooms ofa school or other building similarly occupied, require that more heatshall be supplied to some than to others. Rooms that are on thesouth side of the building and exposed to the sun, may perhaps bekept perfectly comfortable with a supply of heat that will maintaina temperature of only 50 or GO degrees in rooms on the opposite sideof the building which are exposed to high winds and shut off from thewarmth of the Fig. 160. Hot-Blast Apparatus with Double Duct for Supplying Air at Different Temper-atures to Different Parts of a Building. With a constant and equal air-supply to each room, it is evidentthat the temperature must be directly proportional to the coolingsurfaces and exposure, and that no building of this character can beproperly heated and ventilated if the temperature cannot be variedwithout affecting the air-supply. There are two methods of overcoming this difficulty:The older arrangement consists in heating the air by means of aprimary coil at or near the fan, to about 60 degrees, or to the minimumtemperature required within the building. From the coil it passesto the bases of the various tines, and is there still further heated asrequired, by secondary or supplementary heaters placed at the base ofeach fine. 193 184 HEATING AND VENTILATION With the second and more recent method, a single heater isemployed
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