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Calculate the change of entropy in each process.

0.6 m3 of air at 37oC and 1 bar is heated at constant volume until the pressure becomes 2 bar. It is then cooled at constant pressure to its original temperature.

1 Answer
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Given: V1=0.6m3,T1=310K,P1=1bar

  1. Constant Volume Heating to P2=2bar,T2=620K
  2. Constant Pressure Cooling to 310K

Solution:

For Constant Volume Process

ΔS=Cvloge(T3T2)

ΔS=0.718×loge(620310)

ΔS=0.49767kJ/kg

For Constant Pressure Process

ΔS=Cploge(T3T2)

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