An uninsulated separation machine receives 1.5 m3/s of a mixture of He and O2 at 40°C and 100 kPa. The mixture is initially 30% He and 70% O2 by volume. The machine separates the two gases into separate streams, and uses 10 kW of power in the process. Determine the heat transfer rate for the machine if (a) the He and O2 both exit at 30°C, (b) the He exits at 20°C and the O2 exits at 40°C, and (c) the He exits at 40°C and the O2 exits at 20°C. Solve part (a) both by treating the whole process as an ideal gas mixture and by treating the gases as two separate streams throughout.
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