Transactions of the American Society of Mechanical Engineers Volume 33

Transactions of the American Society of Mechanical Engineers Volume 33

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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. 1912 edition. Excerpt: ...is to be placed in the heating value calculated from this analysis. 'Corrected to sulphur free basis. As further evidence of errors in the heating value determinations as reported in the paper, the B.t.u. from Tables 17 and 18 have been plotted in Fig. 21 with radiation, etc., from the first set of heat balances of Tables 15 and 16. While the percentage of radiation is probably afiected to some extent by other factors, it is very evident from the location of these points that the real heating value of the coal used on the various tests was much more uniform than the figures used in the calculations. The lower the B.t.u. used in the calculations, the higher would be the efficiency and the lower the radiation loss, and vice versa. The errors in the sampling and analysis of the coal are evidently much greater than those entering into the other results of the tests. If Dr. J acobus had had all the coal used on each test check-weighed on two sets of scales by two observers, and they had not agreed more closely than 6 per cent, would he have averaged the weights with only a passing comment and no attempt at an explanation? There would undoubtedly have been some rigid investigation and the cause of the difference soon determined and rectified. If the efficiency of the boiler and furnace are to be determined, it is just as important to know the true heating value of the coal as it is to know theweight of coal and water used during the test. By averaging the results of the two laboratories, Dr. J acobus has evidently assumed that they each made errors of equal magnitude in opposite directions. It would be very strange if such were the case when the differences are so great. There is strong evidence t0 the 11tYaYy1 and it appears that the...show more

Product details

  • Paperback | 330 pages
  • 189 x 246 x 18mm | 590g
  • Rarebooksclub.com
  • United States
  • English
  • black & white illustrations
  • 1236876636
  • 9781236876638