The Steam-Engine And Other Steam-Motors; a Text-Book for Engineering Colleges And a Treatise for Engineers 1
The Steam-Engine And Other Steam-Motors; a Text-Book for Engineering Colleges And a Treatise for Engineers 1
Robert Culbertson Hays Heck
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per sq. in. Solving in i 29 Wl APPLICATIONS OF THE STEAM-JET 205 terms of work per pound of steam rather than by the hour, and by the pressure volume method, we get PF-144X101.4X^;^-5802X.220 ol.O -1276 F.P. or 1.64 H.U So that out of a total heat^upply of 1160.8-40.6-1120.2 B.T.U. (estimated above the temperature of the cold feed-water), only 1.64 B.T.U. is effectively transformed; and the absolute efficiency has the ridiculously low -value 1 64 ^---—-.00146. 1120 (j) Bange op the Injector. — ...^In the matter of discharge- pressure,' it is possible, by suitably proportioning the steam-nozzle and the inlet to the mixing-tube, to have this pressure far above that of the steam, even using the exhaust from a non-condensing engine to feed the boiler. In this case the water pmnped per pound of steam will be relatively small, because the energy of the steam-jet is small; consequently the supply-water must be cold, so that the steam will be condensed without making the final temperature too high.
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