An Elementary Treatise on Steam

An Elementary Treatise on Steam

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This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1874 edition. Excerpt: ...that the smoke and carbonic acid may be dissipated. With a quick draught, less air is necessary for diluting the carbonic acid (which would otherwise prevent combustion), as the carbonic acid is now drawn away more rapidly. It may be here noticed, not necessarily however, as a more economical condition, that the temperature of the furnace is higher in this case, and there is quicker giving up of heat to the water, and hence quicker evaporation. In a competitive trial of the steam-jet and fans for creating artificial draught by Mr. lshcrwood (U.S.) on marine engine furnaces, the losses were, 'respectively, 973 and. 1-4 per cent. of the whole expenditure of fuel. I do not know whether these experiments have been repeated. In particular cases the question arises, What is the most convenient temperature to which the gases should be cooled? Irrespective of the necessity for chimney-draught, they ought, of course, to be cooled as much as possible; but an inconvenient length of flues may be necessary, or else the flues may be so much obstructed, that a great draught is necessary. It will be found that it is in general best to have the flow of gases much obstructed, as in locomotive engines, wherever it is possible to employ artificial draughts. Experiments on boilers, made in 1872 by a Committee of the American Institute, show ' that the introduction of boilers-having exceptionally large proportions of heating-surface, and with large feed-water heaters, and depending upon a mechanical draught, will, when properly designed and constructed, be attended with a marked economy, which the Committee judge should more than compensate for the increased trouble and expense involved if large boiler-power is required." The sectional area of the tubes or more

Product details

  • Paperback | 96 pages
  • 189 x 246 x 5mm | 186g
  • Miami Fl, United States
  • English
  • black & white illustrations
  • 1236500466
  • 9781236500465