Applying the Entropy Balance: Control VolumesSteam at

Chapter 6, Problem 91P

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Steam at \(240^{\circ} \mathrm{C}\), 700 kPa enters an open feedwater heater operating at steady state with a mass flow rate of 0.5 kg/s. A separate stream of liquid water enters at \(45^{\circ} \mathrm{C}\), 700 kPa with a mass flow rate of 4 kg/s. A single mixed stream exits at 700 kPa and temperature T. Stray heat transfer and kinetic and potential energy effects can be ignored. Determine (a) T, in \({ }^{\circ} \mathrm{C}\), and (b) the rate of entropy production within the feedwater heater, in kW/K. (c) Locate the three principal states on a sketch of the T–s diagram.

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