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. 1907 edition. Excerpt: ...is maintained constant by the piston remaining stationary at the end of the stroke, the total weight of steam remaining in the vaporous condition must be constantly growing less. That is, condensation must be taking place. The volume, V0, is known, and the vapor tables give the volume which one pound ...
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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. 1907 edition. Excerpt: ...is maintained constant by the piston remaining stationary at the end of the stroke, the total weight of steam remaining in the vaporous condition must be constantly growing less. That is, condensation must be taking place. The volume, V0, is known, and the vapor tables give the volume which one pound of vapor would occupy if dry and saturated at the pressure PB. Assuming unit weight of working substance and neglecting the volume of liquid present at C as very small compared with the volume of vapor, the quality is where V; is the volume per pound of dry and saturated vapor at pressure P, . For any weight of working substance other than unity, 'it is only necessary to multiply V', in (101) by the number of pounds of material present. At any later time, when the pressure has dropped to P, ', the specific volume V, above will have changed to some new and larger volume, V',1, and the quality will be so that the quality may be very approximately found for any point on the line cd of Fig. 20. As was developed in connection with Fig. 15, the point c of Fig. 21 divides the line fg in such a way that and since the quality at any point of the line od can be found by the method outlined in the last paragraph, the length of the line c'g' for any position is easily determined, because for any position which may be selected. Therefore by choosing enough positions for the point c', a suflicient number of lengths c'g' may be calculated to make possible the plotting of the line cd, after which the cycle continues along the same horizontal line as is used in the Clausius Cycle.. The Rankine Cycle is often modified in practice by adding more heat along the line ab than.is required to form dry and saturated vapor. The.
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