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Therefore the isentropic relations developed earlier

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Unformatted text preview: device is 8, determine the final temperature of the air. SOLUTION A sketch of the system and the T-s diagram for the process are given in Fig. 7–38. We note that the process is reversible and adiabatic. Assumptions At specified conditions, air can be treated as an ideal gas. Therefore, the isentropic relations developed earlier for ideal gases are applicable. Analysis This process is easily recognized as being isentropic since it is both reversible and adiabatic. The final temperature for this isentropic process can be determined from Eq. 7–50 with the help of relative specific volume data (Table A–21), as illustrated in Fig. 7–39. Process: isentropic Given: υ1, T1, and υ2 Find: T2 T . . . T2 T1 . . . . . . υr . . . read υ = υ2 υ . r2 υ1 r1 . . read υr1 . . . At T1 295 K: From Eq. 7–50: υ2 υ1 647.9 V2 V1 υr1 For closed systems: υr2 υr1 υ2 υ1 (647.9) 80.99 → T2 662.7 K Therefore, the temperature of air will increase by 367.7°C during this process. ALTERNATIVE SOLUTION The final temperature could also be determined from Eq. 7–42 by assuming co...
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