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Water is cooled within a piston-cylinder device from an initial state of 6 bars and 300°C to a final state of a saturated liquid at the same pressure.
a) Determine the work done in kJ/kg
b) Determine the amount of heat transfer in kJ/kg
A piston-cylinder device contains helium gas initially at 145 kPa, 20 degrees C, and 0.5 m^3. The helium is now compressed in a polytropic process (PV^n = constant) to 400 kPa and 140 degrees C. Determine the heat loss or gain during this process.
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