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Heat engines, embracing the theory, construction, and performance of steam boilers, reciprocating steam engines, steam turbines and internal combustion engines; a text-book for engineering students

Price: $29.41
Available on Amazon.com Books
(as of 29/07/2014 12:14 PDT) - Details
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PRODUCT#: 916613127

Product Description

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. 1920 Excerpt: .between these two amounts, 1-193-0-920 = 0-273 lb, is known as the missing quantity of steam per stroke at the point A. Neglecting leakage the missing quantity is accounted for by condensation. Hence the steam at A is not dry and its dryness. 0-920 fraction is-=0771. j 1 y o It will be noticed that the actual weight of steam at A, 1193 lb, was obtained by adding the cushion steam to the cylinder feed, and in computing the cushion steam it was assumed to be dry and saturated which is probably not strictly true. But at B the temperature of the cylinder cannot differ much from that of the steam, and the water in the steam during exhaust would probably pass to the condenser. In any case the weight of the cushion steam is generally small compared with the cylinder feed and therefore any error in regard to the dryness of the cushion steam will have little influence on the dryness fraction of the steam at A as calculated above. 213. Saturation Curve on Indicator Diagram-Still referring to Fig. 339, it has been shown that for the point A there is 1 "193 lb. of steam and water in the cylinder. Neglecting the volume of the water, the volume of the steam is OM which represents 22-77 cubic feet, but if all the water and steam present were dry saturated steam the volume would be 24-74 x 1-193 = 29'51 cubic feet. Now on the horizontal line through A make RS = 29-51 on the volume scale of the diagram, then S is a point on the saturation curve. The distance AS is the volume of the missing quantity and the ratio of RA to RS is the dryness fraction of the steam in the cylinder for the point A. Any number of points on the saturation curve may be found by taking from the steam table the volumes of 1 lb. of dry saturated steam at selected pressures and multiplying t.. Price: $29.41

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