Items related to A practical treatise on the steam engine indicator...
A practical treatise on the steam engine indicator and indicator diagrams; with notes on steam engine performances, the expansion of steam, behaviour ... engine cylinders, and on gas engine diagrams - Softcover
Synopsis
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. 1888 Excerpt: ... the re-evaporation during expansion of the steam so' condensed, that re-evaporation taking place as the pressure falls to that under which the condensed steam will boil, and continuing to do so until exhaust takes place. It would be more correct to speak of this as a maintenance of pressure rather than a rise of pressure, as the re-evaporation does not cause a rise but retards the fall of pressure. It must be remembered that the pressure and temperature of saturated steam--that is, steam in the presence of the water from which it is evaporated--rise together, though not exactly in the same ratio. Every given weight of saturated steam has a definite volume, pressure, and temperature. That is to say, any given weight of water will give a specific volume of steam at a specific temperature or pressure. This is known as specific or relative volume. By plotting specific volumes and pressures we obtain a curve which differs somewhat from the so-called isothermal curve or hyperbolic curve, and from the adiabatic curve, and is in many cases rather nearer the actual indicator diagram than either of these. It is, however, almost as of ten so, partly as a result of a combination of contributing causes, including clearance, initial condensation, and subsequent re-evaporation, which in other cases may operate to make it incorrect, but inherently it is more correct as a theoretical curve than either of the others. It deals with steam as steam, and represents graphically the results of the experiments of Kognault, Fairbairn, and others, made under conditions which are very much those of the steam engine, except as to the sources of loss above mentioned. The following table gives a few corresponding temperatures, pressures, and volumes merely for convenience in dealing wit...
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