Thermodynamics

696 | ThermodynamicsAlso,h m1 ,ideal y N2h 1,ideal,N2 y O2h 1,ideal,O2 10.792 16391 kJ>kmol2 10.212 16404 kJ>kmol2 6394 kJ>kmolh m2 ,ideal y N2h 2,ideal,N2 y O2h 2,ideal,O2 10.792 14648 kJ>kmol2 10.212 14657 kJ>kmol2 4650 kJ>kmolTherefore,qout 1h m1 ,ideal h m2 ,ideal2 R u T cr 1Z h1 Z h22 m 316394 46502 kJ>kmol4 18.314 kJ>kmol # K21132.2 K211.0 2.62 3503 kJ/kmol(c) The reduced temperatures and pressures for both N 2 and O 2 at the initialand final states and the corresponding enthalpy departure factors are, fromFig. A–29,N 2 :T R1 ,N 2 T m,1 220 KT cr,N2 126.2 K 1.74fZP R,N2 P h1 ,N 2 0.9m 10 MPa3.39 MPa 2.95P cr,N2T R2 ,N 2 T m,2 160 KT cr,N2 126.2 K 1.27fZ h2 ,N 2 2.4O 2 :From Eq. 12–58,T R1 ,O 2 T m,1 220 KT cr,O2 154.8 K 1.42P R,O2 P mP cr,O210 MPa5.08 MPa 1.97T R1 ,O 2 T m,2 160 KT cr,O2 154.8 K 1.03fZ h1 ,O 2 1.3fZ h2 ,O 2 4.01h 1 h 2 2 N2 1h 1,ideal h 2,ideal 2 N2 R u T cr 1Z h1 Z h22 N2 316391 46482 kJ>kmol4 18.314 kJ>kmol # K21126.2 K210.9 2.42 3317 kJ>kmol1h 1 h 2 2 O2 1h 1,ideal h 2,ideal 2 O2 R u T cr 1Z h1 Z h22 O2 316404 46572 kJ>kmol4 18.314 kJ>kmol # K21154.8 K211.3 4.02 5222 kJ>kmolTherefore,qout y N21h 1 h 2 2 N2 y O21h 1 h 2 2 O2 10.79213317 kJ>kmol2 10.21215222 kJ>kmol2 3717 kJ/kmol