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Water at 15 bar and 20 C is throttled to final pressure such that the temperature is 5 C. Determine the pressure and the entropy

Water at 15 bar and 20 °C is throttled to final pressure such that the temperature is 5 °C. Determine the pressure and the entropy generation. How much work could be produced if instead of throttling the final pressure is reached via expansion in a reversible expander?

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