Mechanical equipment of buildings; a reference book for engineers and architects (1916)
Harding, Louis Allen, Willard, Arthur C. (Arthur Cutts), 1878-1960 · New York Wiley · leaf 165
emperature of feed water (t2 — U). D = algebraic mean temperature difference between feed water and flue gas(7\ - U) + {T% - k) w = pounds of feed water per boiler horsepower-hour. (Approx. 30.)W = weight of flue gases per boiler horsepower-hour, pounds. (Approx. coal perb.hp.-hour X 20.)c =… … >5f SUPERHEATERS AND ECONOMIZERS 153 S = square feet of economizer surface per boiler-horsepower. = 3.5 to 5.U = unit heat transmission of economizer tubes or B.t.u. transmitted per sq.ft. per deg. difference in mean temperature per hour.UD S = B.t.u. transmitted per hour per b.hp. UDS = x UD…
Building · Heating · Ventilation
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