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+1 vote
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in Physics by (67.9k points)

 A spring loaded piston cylinder contains 1.5 kg air at 27°C and 160 kPa. It is now heated in a process where pressure is linear in volume, P = A + BV, to twice the initial volume where it reaches 900 K. Find the work, the heat transfer and the total entropy generation assuming a source at 900 K. 

1 Answer

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Best answer

C.V. Air out to the 900 K source. Since air T is lower than the source temperature we know that this is an irreversible process. 

Continuity Eq.: m2 = m1 = m,

Energy Eq  m(u2 – u1) = 1Q21W2

Entropy Eq  m(s2 – s1) = ∫ dQ/T + 1S2 gen = 1Q2/TSOURCE + 1S2 gen 

Process: P = A + BV 

From the process equation we can express the work as

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