. Bulletin. Science. 4. Compressed air flows through re- generator to working cylinder dur- ing first part of working stroke. 5. After cutoff, air In working cylinder expands as it receives heat from the is exhausted through the ator to atmosphere. Figure 6.âThe successive processes of the caloric engine cycle. In each illustration the supply cylinder is above the working cylinder; the receiver is at upper left; and the regenerator is shown as the shaded rectangle below the receiver. as large as the Ericsson at 6)2 knots. His results ranged from 247 to 276 horsepower, suggesting agai
. Bulletin. Science. 4. Compressed air flows through re- generator to working cylinder dur- ing first part of working stroke. 5. After cutoff, air In working cylinder expands as it receives heat from the is exhausted through the ator to atmosphere. Figure 6.âThe successive processes of the caloric engine cycle. In each illustration the supply cylinder is above the working cylinder; the receiver is at upper left; and the regenerator is shown as the shaded rectangle below the receiver. as large as the Ericsson at 6)2 knots. His results ranged from 247 to 276 horsepower, suggesting again that the actual output of the caloric engine probably was on the order of 250 horsepower. From the standpoint of fuel consumption, fairly reliable data were available for steamships, but no data were forthcoming for the Ericsson. Captain Ericsson said that the actual consumption of coal was 6 tons, and that his furnaces could not possibly burn more than 7 tons in 24 hours. When this statementâ made when the ship had been in operation for only a few hoursâwas challenged, he raised his limit to 8 tons per day.*" Using his figure for the area of *" Appletons' Mechanics' Magazine and Engineers' Journal, 1853, vol. 3, pp. 27, 92. grate surface, it would appear that a normal fire, burning with natural draft, might consume about 12 tons of coal per day.*' A Collins liner, operating at 6)i knots, would be expected to burn about this latter amount of coal.*^ The sort of testing to which Captain Ericsson's caloric engines were subjected is indicated by his description of his 60-horsepower engine, after which the Ericsson's engine was patterned: <' Richard Sennet {Marine Steam Engine, ed. 2, London, 1885, pp. 88, 93) gave 21 pounds per hour per square foot as about the minimum consumption for a cramped boiler firebox. â â¢- Thomas Tredgold, Marine Engines and Boilers, London, n. d., vol. 1, division b, p. 30; George H. Preble, Chronological History of Steam Navigation
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