An insulated heat exchanger is used to cool oil (whose specific heat is 0.43 Btu/lbm?R) from 280°F to 100°F, at constant pressure, by transferring heat to an ideal gas mixture. The mass flow rate of the oil is 4.5 lbm/s. The ideal gas mixture enters at 60°F and exits at 240°F, and flows at a constant pressure of 30 psia. Determine the mass flow rate of the mixture, the inlet volumetric flow rate of the mixture, and the rate of entropy generation for the process for mixture compositions of (a) 50% N2 and 50% H2 (by volume), (b) 50% N2 and 50% CO (by volume), and (c) 50% N2 and 50% CO2 (by volume).
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