Heat engineering; a text book of applied thermodynamics for engineers and students in technical schools . Fig 17.—Orifice for flowof fluid. Hence total energy at 1Total energy at 2 = H- 2g + ui 4- pit>ij+ u2 + p2v2J Now if there is any heat added between these two points, sayMJq, the energy at 2 must equal that at 1 plus MJq. Of courseif Jq is taken away the sign would change. Hence or since Wi£W2 w2 + Ui + P\Vi + Jq = -ft- + u2 + p2v2 2g 2 _ Wi 2g = Jq + Wi + piVi — (w2 + P2V2)= Jq + J(ii Ui + P\Vi i2)Jii (127) (128) FUNDAMENTAL THERMODYNAMICS 57 If now F\ is so large that Wi is small and

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Heat engineering; a text book of applied thermodynamics for engineers and students in technical schools . Fig 17.—Orifice for flowof fluid. Hence total energy at 1Total energy at 2 = H- 2g + ui 4- pit>ij+ u2 + p2v2J Now if there is any heat added between these two points, sayMJq, the energy at 2 must equal that at 1 plus MJq. Of courseif Jq is taken away the sign would change. Hence or since Wi£W2 w2 + Ui + P\Vi + Jq = -ft- + u2 + p2v2 2g 2 _ Wi 2g = Jq + Wi + piVi — (w2 + P2V2)= Jq + J(ii Ui + P\Vi i2)Jii (127) (128) FUNDAMENTAL THERMODYNAMICS 57 If now F\ is so large that Wi is small and if q = 0, the formulabecomes w2? j(< in or 2ff w2 = -*j2gj(ii - j2) (129)(130) Since q = 0 this action is adiabatic but in the case that therebe internal friction, 1 and 2 are not on points on an isoentropic line but a line passing to the right ofthis line on the T-S plane. In otherwords, i2 is greater than it would havebeen if there had been no amount of this increase in i2 isusually found by assuming that 2 hasthe same entropy as 1 and then in-. Fig. 18. -TS d of flu

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Keywords: ., bookcentury1900, bookdecade1910, bookpublishernewyo, bookyear1915