Steam engines, a thorough and practical presentation of modern steam engine practice (1920)
Ludy, Llewellyn V., 1875-, American Technical Society · Chicago, American technical society · leaf 125
s. It has been shown that the efficiency ofthe theoretical engine is purely a thermal consideration; the efficiencyof the actual engine, however, is largely a mechanical matter. Theunit of work is the horsepower, which corresponds to the develop-ment of 33,000 foot pounds per minute. As 778 foot… … Fig. 71. Superposed Ideal and Actual Indicator Diagrams Thermal Units per horsepower per minute, it is evident that itsefficiency will only be one-half, or 50 per cent, because 42.42 is one-half of 84.84. Hence, it may be said that the efficiency of the actual , , 42.42 engine is equal to ^ . . ,…
Steam-engines
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