(Solution) - Ex 11 9 Nitrogen at 10 MPa and 150 K flows -(2025 Original AI-Free Solution)

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Ex: 11-9 Nitrogen at 10 MPa and 150 K flows steadily through a tube with a mass flow rate (m?) of 1 kg/s, receiving heat from the surroundings at 300 K. At the end of the tube it enters an expansion valve and leaves at 1 MPa and 125 K. Using the real gas model determine (a) the rate of heat transfer (Q?), and (b) entropy generation rate (S?gen,univ) in the thermodynamic universe. What-if Scenario: What would the answers be if (c) the ideal gas, or (d) the phase-change model were used instead?