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A piston–cylinder assembly initially contains 0.1 m3 of carbon dioxide gas at 0.3 bar and 400 K. The gas is compressed isentropically to a state where the temperature is 560 K. Employing the ideal gas model and neglecting kinetic and potential energy effects, determine the final pressure, in bar, and the work in kJ, using

(a) data from Table T-11.

(b) a constant specific heat ratio from Table T-10 at the mean temperature, 480 K.

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(c) a constant specific heat ratio from Table T-10 at 300 K.

Air enters a turbine operating at steady state at 6 bar and 1100 K and expands isentropically to a state where the temperature is 700 K. Employing the ideal gas model and ignoring kinetic and potential energy changes, determine the pressure at the exit, in bar, and the work, in kJ per kg of air flowing, using

(a) data from Table T-9

(b) a constant specific heat ratio from Table T-10 at the mean temperature, 900 K.

(c) a constant specific heat ratio from Table T-10 at 300 K.

 
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