Cyclopedia of architecture, carpentry, and building : a general reference work ... (1907)
American School of Correspondence · Chicago : American Technical Society · leaf 109
uldhave a difference in tempera-ture of about 220 degrees,which^ under the conditionsstated, would give an efficiencyof 220 X 2 = 440 B. T. U.per hour for each square footof radiation. By making a similar computation for 10 degrees be-low zero, we find the efficiency to be 460. In the same manner… … Fig. 57. End View of Several School PinRadiator Sections Connected Togethei*. 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 440and 460 are used for dwelhngs, we mav substitute GOO…
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