4 mpa s1 figure 715 schematic and t s diagram for

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Unformatted text preview: –15 Schematic and T-s diagram for Example 7–5. cen54261_ch07.qxd 11/18/03 9:57 AM Page 286 286 FUNDAMENTALS OF THERMAL-FLUID SCIENCES The inlet state is completely specified since two properties are given. But only one property (pressure) is given at the final state, and we need one more property to fix it. The second property comes from the observation that the process is reversible and adiabatic, and thus isentropic. Therefore, s2 s1, and h1 s1 State 1: P1 T1 5 MPa 450°C State 2: P2 s2 1.4 MPa s1 3316.2 kJ/kg 6.8186 kJ/kg · K h2 2966.6 kJ/kg Then the work output of the turbine per unit mass of the steam becomes wout 7–5 I h1 h2 3316.2 2966.6 349.6 kJ/kg PROPERTY DIAGRAMS INVOLVING ENTROPY Property diagrams serve as great visual aids in the thermodynamic analysis of processes. We have used P-υ and T-υ diagrams extensively in previous chapters in conjunction with the first law of thermodynamics. In the second-law analysis, it is very helpful to plot the processes on diagrams for which one of the coordinates is entropy. The two diagrams commonly u...
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This document was uploaded on 11/28/2012.

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