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: ...that is, y, for then T X = Q, the amount of heat added during the process. Suppose that the heatQ, which is required to produce a process, such as an expansion or a compression, is divided up into a number of small increments dQ (Fig. 22) and that each small increment of heat is divided by the average absolute ...
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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: ...that is, y, for then T X = Q, the amount of heat added during the process. Suppose that the heatQ, which is required to produce a process, such as an expansion or a compression, is divided up into a number of small increments dQ (Fig. 22) and that each small increment of heat is divided by the average absolute temperature at which the heat change occurs. There will then be a series dQ expressions of which, when integrated, will give the total change in the abscissas. This quantity f when multiplied by the average absolute temperature between C and D will give the total amount of heat involved during the process. Mathematically expressed, the change in the abscissas is---/, (121) The heat change involved is dQ = Tdj or Q = JT dj. (122) The quantity 0 in the equations is known as the increase in entropy of the substance, and may be defined as a quantity which, when multiplied by the average absolute temperature occurring during a process, will give the number of heat units (in B.t.u.) added or abstracted as heat during the process. The "increase in entropy" is employed rather than entropy itself, because only the differences in entropy are important. This definition of entropy states that in a temperature-entropy diagram such as Fig. 22, where the ordinates are absolute temperatures, and the abscissas are entropies as calculated above some standard temperature, the area under any line CD gives the number of heat units added to the substance in passing from a temperature 7 and entropy ji = Oe to a temperature T2 and entropy fa = Of (or the number of heat units abstracted in passing from Tz to Ti). Entropy Changes During Constant Pressure Expansions of Gases. The heat supplied or abstracted during a constant pressure expansion or compression of a gas ...
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Add this copy of Elements of Engineering Thermodynamics to cart. $8.00, good condition, Sold by Top Notch Books rated 5.0 out of 5 stars, ships from Tolar, TX, UNITED STATES, published 1923 by John Wiley & Sons Inc.
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Good. No Jacket. Ex-Libris. 8vo-over 7¾"-9¾" tall. Boards are scuffed with light wear, bumped corners. Previous owner stamp on front end pages. Pages are clean & text is free from markings. All pages secure in binding.
Add this copy of Elements of Engineering Thermodynamics to cart. $24.41, new condition, Sold by Revaluation Books rated 4.0 out of 5 stars, ships from Exeter, DEVON, UNITED KINGDOM, published 2009 by Read Books.
Add this copy of Elements of Engineering Thermodynamics to cart. $58.41, good condition, Sold by Bonita rated 4.0 out of 5 stars, ships from Newport Coast, CA, UNITED STATES, published 2016 by Palala Press.
