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MOTIVE POWER OF HEAT.
203
TABLE B.
Various Engines in which the Temperature of the Boiler is 121° C.[1] and that of the Condenser 30° C.
Theoretical Duty for each Unit of Heat transmitted, 371 foot-pounds.
Cases. | Work produced for each lb. of coal consumed. | Work produced for each lb. of water evaporated. | Work produced for each unit of heat transmitted. | Percentage of theoretical duty. |
---|---|---|---|---|
Ft.-lbs. | Ft.-lbs. | Ft.-lbs. | ||
(3) French engines, according to contract | ........ | 98,427 | 160.3 | 43.2 |
(4) English engines, according to contract | 565,700 | × 80,814 | 130.8 | 35 |
(6) Common engines, consuming 12 lbs. of coal per horse-power per hour | 165,000 | × 23,571 | 38.1 | 10.3 |
(7) Improved engines with expansion cylinders, consuming an equivalent to 4 lbs. best coal per horse-power per hour | 495,000 | × 70,710 | 114.4 | 30.7 |
- ↑ Pressure 15 lbs. on the square inch.