The steam engine and turbine; a text-book for engineering colleges (1911)
Heck, Robert Culbertson Hays, 1870- · New York, D. Van Nostrand company · leaf 61
er or by averaging ordinates. Usually, the mean pressure through-out a certain volume change is found, whereupon U = Pm(v2-v1); ........ (23) but sometimes a work scale per unit of area is used, like that shown inFig. 31, where the unit of base represents 1 cu. ft. and the same unit ofordinate 1000… … Cu Ft. • 5 |o Fig. 31. — The Isothermal Curve. relation Pv = Pivh and desiring to integrate Pdv between the limits V\and v2 which locate the ordinates Al and B2 on Fig. 31, we get P interms of v as §7(/)] THERMODYNAMIC OPERATIONS WITH GASES. 45 whence Pdv = PlVl / - = Pi0iloge-vi JVl V Vi V2 I rav…
Steam-engines · Steam-turbines
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