Handbook for heating and ventilating engineers . SECOND FLOOR 9. Fig. 67. HOT WATER AND STEAM HEATING 131 1226^ 7-26-3 I6-26-3 l4-^A-3 16-26-3MAIN AND RISER LAYOUT. Fig. 67a. 88. Insulatlns Steam Pipes:—In all heating systems,pipes carrying steam or water should be insulated to protectfrom heat losses, unless these pipes are to serve as radiatingsurfaces. In a large number of plants the heat lost throughthese unprotected surfaces, if saved, would soon pay for firstclass insulation. The heat transmitted to still air through 132 HEATING AND VENTILATION one square foot of t
Handbook for heating and ventilating engineers . SECOND FLOOR 9. Fig. 67. HOT WATER AND STEAM HEATING 131 1226^ 7-26-3 I6-26-3 l4-^A-3 16-26-3MAIN AND RISER LAYOUT. Fig. 67a. 88. Insulatlns Steam Pipes:—In all heating systems,pipes carrying steam or water should be insulated to protectfrom heat losses, unless these pipes are to serve as radiatingsurfaces. In a large number of plants the heat lost throughthese unprotected surfaces, if saved, would soon pay for firstclass insulation. The heat transmitted to still air through 132 HEATING AND VENTILATION one square foot of the average wrought iron pipe is from 2to B. t. u. per hour, per degree difference of temperaturebetween the inside and the outside of the pipe. Assumingthe minimum value, and also that the pipe is fairly wellprotected from air currents, the heat loss is, with steam at100 pounds gage and 80 degrees temperature of the air,(338 — 80) X 2 = 516 B. t. u. per hour. With steam at 50, 25and 10 pounds gage respectively this will be 436, 374 and 320B. t. u. If the pipe were located in moving air, this loss wouldbe much increased. It is s
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectventila, bookyear1913
