Arithmetic Of The Steam Boiler A Reference Book Showing The Various Applications Of Arithmetic To Steam Boilers

Author : Charles James Mason
Publisher : Rarebooksclub.com
ISBN 13 : 9781230174105
Total Pages : 38 pages
Book Rating : 4.1/5 (741 download)

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Download or read book Arithmetic of the Steam Boiler; a Reference Book Showing the Various Applications of Arithmetic to Steam Boilers written by Charles James Mason and published by Rarebooksclub.com. This book was released on 2013-09 with total page 38 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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. 1913 edition. Excerpt: ...for a part of a flat surface which is square or rectangular, the value of D in the flat surface formula shall be the diagonal of the square or rec-tangle. The numbers 20,000 and 3500 are con-stants, evidently empirical, and found from experiment. A boiler is sold on a guarantee that it will evaporate 12 lb. of water per pound of combustible, from and at 212 F., with coal having a heat value of 14,500 B.t.u. per pound of coal, and 8 per cent. ash. When the test was made the average feed-water temperature was 1800 F., average steam pressure 70 lb., heat value of the coal used 12,000 B.t.u. per pound, and the ash content 8 per cent.; water evaporated, 9 lb. per pound of coal consumed. It is required to ascertain how the test compares with the guarantee. Under the conditions of the guarantee the coal is.08 ash, and 1--.08 =.92 combustible. If 1 lb. of coal contains 14,500 B.t.u., 1 lb. of com 14500 bustible will contain =15,760 B.t.u..92 J" With this it is agreed to evaporate 12 lb. of water from and at 212 F. or 1 lb. under those conditions for, 15760 _, ., each =1313 B.t.u. supplied. The temperature corresponding to 85 lb. absolute (70 lb. gage in round numbers) is 316.3 F. To raise 1 lb. of water from 32 to 316.30 requires 286.30 B.t.u. To raise 1 lb. of water from 32 to 180 requires 147.88 B.t.u. To raise 1 lb. of water from 180 to 316.30 requires 138.42 B.t.u. To evaporate 1 lb. of water from and at 316.30 requires 897.10 B.t.u. To raise 1 lb. of water from 1800 to 316.30, and evaporate it at 85 lb. pressure absolute, requires 1035.52 B.t.u. The coal used at the test contained 12,000 B.t.u. per 12000 pound, and as there was 8 per cent. of ash, = 13,043 B.t.u. per lb. of combustible. Under the conditions of the test, 1035.52 B.t.u....