Cyclopedia of heating, plumbing and sanitation; a complete reference work . EXCELSIOR PATTERN RADIATOR USED IN THE INDIRECT METHOD OF WARMING American Radiator Company. METHOD OF INDIRECT WARMING AND VENTILATION, SHOWING ROTARYCIRCULATION OF AIR American Radiator Company HEATING AND VENTILATION 17 10 per cent for each of the firs! two conditions, ;m<l 20 per cent for thelast. Making these corrections we have: 57,344 X X X X = 96, one pound of coal furnishes 8,000 B. T. U., then 96,338 -i- 8,000 =12 pounds of coal per hour required to warm the building to 70°un
Cyclopedia of heating, plumbing and sanitation; a complete reference work . EXCELSIOR PATTERN RADIATOR USED IN THE INDIRECT METHOD OF WARMING American Radiator Company. METHOD OF INDIRECT WARMING AND VENTILATION, SHOWING ROTARYCIRCULATION OF AIR American Radiator Company HEATING AND VENTILATION 17 10 per cent for each of the firs! two conditions, ;m<l 20 per cent for thelast. Making these corrections we have: 57,344 X X X X = 96, one pound of coal furnishes 8,000 B. T. U., then 96,338 -i- 8,000 =12 pounds of coal per hour required to warm the building to 70°under the conditions stated. Approximate Method. For dwelling-houses of the average con-struction, the following simple method for calculating the heat lossmay be used. Multiply the total exposed surface by 4o, which willgive the heat loss in B. T. U. per hour for an inside temperature of 70°in zero weather. This factor is obtained in the following manner: Assume the glasssurface to be one-sixth the total exposure, which is an average propor-tion. Then each square foot of exposed surface consists one-sixthof glass and five-sixths of wall, and the heat loss for 7
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