Determine the specific entropy change,?s,for the following ideal gas processes b

Question

Determine the specific entropy change,?s,for the following ideal gas processes by----- i. integrating the polynomial expression cp(T) found in Table A-21/A-21E ii. then by assuming a constant cp at the average temperature found in Table A-20/A-20E. iii. finally, use the appropriate ideal gas table A-22/A-22E or A-23/A-23E. ---a. Airat98kPaand320Kgoesto953Kand150kPa ---b. Airat82psiand550oFgoesto26psiand780oF

Explanation / Answer

Q = ?U + W = nCpdT for constant pressure process P1, T1--> P1,T2 ?S1 = integral(Q/T) = nCpln(T2/T1) for P1,T2 --> P2,T2 isothermal Q = nRTln(P1/P2) ?S2 = nRln(P1/P2) ?S for P1,T1 to P2,T2 = nCpln(T2/T1) + nRln(P1/P2) please rate me...

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