Steam Charts Also a Table of Theoretical Jet Velocities And the Corrections of
Steam Charts Also a Table of Theoretical Jet Velocities And the Corrections of
Frank Oakes Ellenwood
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803 (c 2 ) Final total heat = 1209. 3 B. T. U. (d 2 ) Final volume =23. 7 cu. Ft. From Plate 8a, for the pressure of 62 pounds and the superheat of 45 we read: The constant pressure external work = 85 B. T. U. From Plate 8b, for the pressure of 20 pounds and the super- heat of 112 we read: The constant pressure external work = 87 . 3 B. T. U. Then we may obtain: (e) Initial intrinsic heat = 1201 - 85 = 1116 B. T. U. Final intrinsic heat = 1209. 3 - 87. 3 = 1122 B. T. U. The heat required to go ...along a constant temperature line is equal to the change hi entropy multiplied by the absolute tem- perature. Hence for this case (f) Heat required = (1. 803 - 1. 67) (340 + 460) = 106. 4 B. T. U. Given to the steam. Representing the initial and final states by the subscripts 1 and 2, we then have, from the fundamental equation of thermodynamics: (g) Work done Heat I 2 supplied J "Gam in intrinsic heat = 106. 4 - [1122 - 1116] = 106. 4 - 6 = 100. 4 B. T. U. NOTE. This problem is of much more importance as a drill in thermodynamics than as a practical question; because it is very difficult to arrange the necessary apparatus to permit steam to expand isother- mally while in the superheated field.
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