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Air initially at 0.1 MPa, 27 degC, is compressed reversibly to a final state. Assume air is an ideal gas with constant specific heats. (a) Find the entropy change of the air when the final state is 0.5 MPa, 227 degC.

Respuesta :

Answer:

The entropy change of the air when the final state is 0.5 MPa and 227°C is 0.051 kJ/kg K

Explanation:

According the assumptions:

-air as ideal gas

-constant specific heats

The change of entropy is equal to:

[tex]S_{2} -S_{1} =C_{p} ln(\frac{T_{2} }{T_{1} } )-Rln(\frac{P_{2} }{P_{1} } )\\S_{2} -S_{1}=1.005ln(\frac{227+273}{27+273} )-0.287ln(\frac{0.5}{0.1} )=0.051kJ/kgK[/tex]

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