Thermodynamics, Heat Motors, & Refrigerating Machines

Thermodynamics, Heat Motors, & Refrigerating Machines

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This historic book may have numerous typos and missing text. Purchasers can usually download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1891 edition. Excerpt: ...121. In designing an engine of the Stirling type, the horse-power to be delivered and the number of revolutions per minute must be known, in addition to the data already assumed. The number of revolutions will be limited by the piston speed and the length of stroke. The average piston speed may be between 100 and 200 feet per minute. One of Stirling's engines, having a four-foot stroke, was run, in actual practice, at about 28 revolutions per minute, giving an average piston speed of about 22; feet per minute. An air engine, reported upon by M. Tresca, had a stroke of 0.4 1n. (1.3 ft.) and made about 90 revolutions per minute, giving a piston speed of about 120 feet per minute. The large air engines in the steamer Ericsson had an average piston speed of 108 feet per minute. Let N = the number of revolutions per minute, S: the average piston speed, l = the length of stroke of the piston, /z: number of horse-power required of the engine, ' W = the work required of the engine per minute; Let w = the number of pounds of working air required; then, since the work done by one pound per revolution will be theoretically, the value of U in equation (201), we have: But the actual work U will be less than the theoretical, and we will assume it to be 0.7, the theoretical. (In designing it is better to assume too small afraction rather than too large.) Then (222) If r be assumed, the weight of air in one cubic foot will be, (205), (210), 1 _ p, To;--R r 1, ' (223) The initial pressure, pa, may be assumed, since it can be produced and maintained by the air pump in connection with the heat derived from the furnace. The volume of the lower part of the receiver will be, (223), (222), R r 1, Pa. Assume the stroke of the plunger to be y l, in...show more

Product details

  • Paperback | 100 pages
  • 189 x 246 x 5mm | 195g
  • Rarebooksclub.com
  • United States
  • English
  • black & white illustrations
  • 123680029X
  • 9781236800299