File:An Experimental Investigation of the Thermodynamical Properties of Super-Heated Steam. On the Cooling of Saturated Steam by Free Expansion (1900) (14796182773).jpg

Identifier: philtrans03337648 (find matches)
Title: An Experimental Investigation of the Thermodynamical Properties of Super-Heated Steam. On the Cooling of Saturated Steam by Free Expansion
Year: 1900 (1900s)
Authors: Grindley, J.
Subjects: Proceedings of the Royal Society of London Philosophical Transactions of the Royal Society
Publisher: Royal Society of London

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0° F. on its faces, would be about 0*037 B.T.U.per minute, and taking the specific heat of the superheated steam as 0*5 and thequantity of steam 1 lb. in 12 minutes, the rise of temperature of the wiredrawnsteam is calculated to be nearly 0*9° F. As in actual experiments the difference oftemperature due to this transference of heat by conduction will be much less thanthis, no attempt has been made to correct the actual results for these differences. Section XV.^—Reduction of the Observations. The performance of any of the experiments here described will give a series ofrelations between the pressure and temperature of the wiredrawn steam for aparticular initial condition of the steam as regards its pressure and temperature. Ifnow these results be plotted on a diagram with pressures for abscissae and tempera-tures as ordinates, we get a series of points as shown in Diagram 5. On thisdiagram the initial condition of the steam in any experiment is shown on the Diagram 5, 3$0i 560 370
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•% ♦» eO 30 W 60 70 60 SO iOO IJO tZO 150 i40 /30 /60 170 180 ($0 S.OQ 210 tSLO 230 24 Me. J. H. aRINDLEY ON AN EXPERlMiSNTAL INVESTIGATION OF saturation curve ^ the number of the experiment being also indicated. When theexperiment was made with steam from the large Lancashire boiler, the points repre-senting the p—t relations observed are indicated by small circles. Suppose now that through the points thus obtained a series of curves be drawn torepresent the law of cooling from any initial condition. It will be found that ifa mean curve be drawn through all the points obtained by using steam in a giveninitial condition, it will also be a mean curve for the points obtained from any singleexperiment at the same initial pressui*e and temperature. The relative accuracywhich the experiments attain is clearly shown by the diagram, the greatest distancefrom any point representing the p—t relation in any experiment to the mean curvethrough the points obtained in all experiments unde

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