10 mol/s of gas flow through a turbine. Find the change in enthalpy that the gas experiences:

A. The gas is steam, with an inlet temperature and pressure T = 600°C and P = 10 bar, and an outlet temperature and pressure T = 400°C and P = 1 bar. Use the steam tables.

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B. The gas is steam, with the same inlet and outlet conditions as in part A. Model the steam as an ideal gas using the value of  given in Appendix D.

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C. The gas is nitrogen, with an inlet temperature and pressure of T = 300 K and P = 10 bar, and an outlet temperature and pressure T = 200 K and P = 1 bar. Use Figure.

Figure Thermodynamic diagram for nitrogen.

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D. The gas is nitrogen with the same inlet and outlet conditions as in part C. Model the nitrogen as an ideal gas using the value of  given in Appendix D.

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E. Compare the answers to parts A and B and to parts C and D. Comment on whether they are significantly different from each other, and if so, why.
 
 

THERMODYNAMIC PROPERTIES OF NITROGEN 0 50 100 150 0.002 200 250 , kJ/kg 300 2007 350 400 0-0.3mkg 450 10 8 6 4 -2 P, MPa 0.6 0.4 0.2 -0.1 500 Based on W.C. Reynolds, Thermodynamic Properties in SI, Department of Mechanical Engineering. Stanford University, 1979