Heat in Its Mechanical Applications. a Series of Lectures Delivered At the Institution of Civil Engineers, Session 1883-84
Heat in Its Mechanical Applications. a Series of Lectures Delivered At the Institution of Civil Engineers, Session 1883-84
Institution of Civil Engineers (Great Britain)
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Fig. 21 shows a pair of figures from the same engines, on another trial, when the jackets were shut off, and the steam main not thoroughly drained. The I.HP. shown in the two cases is almost identical, and the initial pressure of steam nearly the same ; but the great loss, arising chiefly from the want of steam jackets, is shown by the smaller rate of expansion in the second case, viz., 9 • 3, as compared with 15 • 76 times. In a very able Paper, printed in a recent volume of the Minutes of thi...s Institution, Mr. J. G. Mair, M. Inst. C.E., has published a series of tables, containing the result of elaborate and careful calcxdations from the data obtained from ten different engine-trials, including the two cases under consideration, and comparing the performance of the several engines in thermal units per I.HP. per hour ; he calculates the consumption of coal represented in the two cases to be 1-76 lb. with the jackets, and 2*66 lbs. without. He has also kindly furnished me with some figures showing a com- parison of the measurements of water from jacket drains in several trials, from which it appears that the greater the quantity of steam used in the jackets the less is the total quantity of steam and coal used to produce a given effect.
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