. Energy; work, heat and transformations. FIG. B. Again, compare with the above the Beau de Rochas cycle of the ordi-nary gas-engine, as shown in Fig. C. Herein the total temperature-range,from A to C, is usually some 3600° F. Since the absolute temperature atA is about 600, the best efficiency obtainable from the temperature-rangeavailable would be 3600-^4200= The efficiency of the Rankine cycle,. FIG. C. under common ranges of pressure and temperature in condensing engines,or from about 600° to 800° absolute, would be similarly computed as , Of this 25% available the steam-eng
. Energy; work, heat and transformations. FIG. B. Again, compare with the above the Beau de Rochas cycle of the ordi-nary gas-engine, as shown in Fig. C. Herein the total temperature-range,from A to C, is usually some 3600° F. Since the absolute temperature atA is about 600, the best efficiency obtainable from the temperature-rangeavailable would be 3600-^4200= The efficiency of the Rankine cycle,. FIG. C. under common ranges of pressure and temperature in condensing engines,or from about 600° to 800° absolute, would be similarly computed as , Of this 25% available the steam-engine actually develops somethree-fifths, or 15%. But of the 86% available for the gas-engine the latterseldom exceeds about three-tenths, or 26%. The difference is due entirelyto the poor form of the gas-engine cycle. The trouble is that its heat isall isomorphic or sensible in form. In other words, were it practicableto build a heat-engine having the good points of the gas-engine, but usinglatent heat instead of isomorphic heat, its efficiency would be about twicethat of the best standard gas-engines. 170 ENERGY from a retreating piston, but without any direct tendency todiminish their number. That could be done, as was shown fromthe elementary mass-pair, only by a tangential retardation atapastron (the point of contact with the piston). The loss ofradial component against the piston—which
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