Cyclopedia of heating, plumbing and sanitation; a complete reference work . Fig. 57. End View of Several School PinRadiator Sections Connected Together. 84 HEATING AND VENTILATION 75 perature, a somewhat higher efficiency is obtained, owing to the in-creased velocity of the air over the heaters. Where efficiencies of 4 Wand 460 are used for dwellings, we may substitute 600 and 620 forschoolhouses. This corresponds approximately to B. T. I . persquare foot per hour for a difference of 1 degree between the air and steam. The principles involved in indirect steam heating are similarto those a
Cyclopedia of heating, plumbing and sanitation; a complete reference work . Fig. 57. End View of Several School PinRadiator Sections Connected Together. 84 HEATING AND VENTILATION 75 perature, a somewhat higher efficiency is obtained, owing to the in-creased velocity of the air over the heaters. Where efficiencies of 4 Wand 460 are used for dwellings, we may substitute 600 and 620 forschoolhouses. This corresponds approximately to B. T. I . persquare foot per hour for a difference of 1 degree between the air and steam. The principles involved in indirect steam heating are similarto those already described in furnace heating. Pan of the heat givenoff by the radiator must be used in warming up the air-supply to thetemperature of the room, and part for offsetting the loss by conductionthrough walls and The method of computing the heatingsurface required, depends upon the volume of air to be supplied to theroom. In the case of a schoolroom or hall, where the air quantity SIDE \//£\A/ fTNiy VIEW. Fig. 58. Box Up of Wrought-Iron Pipe, for Indirect- Su-ani Heatini; is lane a^ compared with the exposed wall and window surface, weshould proceed a- follow-: First compute the B T. U. required for loss by conductionthrough walls and windows; and to this, add the B. requiredfor the necessary ventilation; and divide the sum by the efficiencyof the radiator-. An example will make this clear. Example. How many square feet of indirect radiation will be requiredto warm and ventilate a .schoolroom in zero weather, when- tin- heal loss byconduction through walls and windows is 36,000 IV T. and the air-suppivi, inn i cubic feet per hour? By the methods given under Heal for Ventilation, we have mho 711 < 1 27 272 B. T. U. required for ventilation.! 163 272 V. Totalheat in turn divided 600 the efficiency of indirect radiatorsunder these conditions giv< 3 272 square feet of surface required. 85 76 HEATING AND VENTILATION Tii
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