File:The steam-engine and other heat-motors (1909) (14773196175).jpg

Identifier: steamengineother00crei (find matches)
Title: The steam-engine and other heat-motors
Year: 1909 (1900s)
Authors: Creighton, William Henry Paul, 1859-
Subjects: Steam-engines Heat-engines
Publisher: New York, J. Wiley & sons (etc., etc.)
Contributing Library: The Library of Congress
Digitizing Sponsor: The Library of Congress

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determined by the mass of steamadmitted and its ratio of expansion. All the power of a compoundor other multiple-expansion engine could be developed in its low-pressure cylinder, disregarding for a moment the necessary strengthof parts and condensation, since, if we admitted into that cylinderthe same mass as was admitted into the high-pressure cylinder,we may expand that mass in this cylinder the same number oftimes as in the multiple-expansion engine against the same backpressure. Find the diameters of the high- and low-pressure cylinders of across-compound engine, gage pressure at the boiler, 150 pounds;total ratio of expansion, 16; ratio of low-pressure cylinder area tothat of the high, 4 to 1; assumed diagram factor derived fromengines of about the same power and of the same general design,83%; back pressure in the condenser is 1 pound absolute; revo-lutions, 120; horse-power, 1000, stroke, 42. 316 THE STEAM-ENGINE AND OTHER HEAT-MOTORS. A B Boiler Pressure Low Pressure Head End
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Pressure in Condenser Fig. 162. MULTIPLE-EXPANSION ENGINES. 317 Expected mean effective pressure (165(1+6l0g16)-l).83^31.45 pounds. For cards, see Fig. Ill31.45 X 3.5 X .4X240 1000. /. A = 1250 or d = 40. 33,000 The diameter of the high-pressure cylinder is 20. Cut-off inthe high-pressure cylinder is at a little less than 1/4 stroke. Assume clearance in high-pressure cylinder is 5%, and in thelow is 7%, and that the volume of the receiver equals the volumeof the L.P. cylinder. To Combine Indicator-cards of a Compound Engine.—TheCombined Diagram is a hypothetical figure, which in its essentialfeatures represents an indicator-diagram which would be obtainedif the whole process of admission, expansion, and exhaust occurredin one cylinder, viz., the low-pressure cylinder. It is a diagramfrom which the pressure of the steam at any point in the strokeof either cylinder, and the volume of that steam, can be measuredfrom one diagram in the same manner that it can be measured inthe case of a

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