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 275
as determined by means of a brake mounted on the flywheel (Fig. 20).Let D = diameter of flywheel measured in feet.n = revolutions of engine per minute.P = resistance at circumference of wheel, lb.R = load on scales, lb.a = length of brake arm, ft. D P X— = RXa. PD = 2Ra 1 horsepower = 33000 ft.-lb.… … Fig. 20. Pront Brake. Example. What is the brake horsepower developed by an engine having a 5 — 0 diameter(D) of wheel running 200 r.p.m. (n), length of brake arm (a) 6 — 0, weight on scales (R) 200 lb. d.hp. = 2 X 3.14 X 6 X 200 X 20033000 45.7. Indicated Horsepower. The indicated horsepower…
Building · Heating · Ventilation
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