Question

A cylinder-piston device contains a mass of 2.4 kg of liquid-vapor mixture water with 70% titer at 50 bar. The system goes through a process of cooling to constant pressure until the obtaining compressed liquid with 14 ºC of subcooling. Evaluate:

(i) The initial and final temperatures of the process.

(ii) The specific enthalpy at the beginning of the process.

(iii) The change in total volume during the process.

(iv) The amount of heat removed from the system during the process.

(v) Sketch the process on a T-v diagram.

Answer #1

A piston-cylinder device initially contains 75 g of saturated
water vapor at 340 kPa . A resistance heater is operated within the
cylinder with a current of 0.6 A from a 300 V source until the
volume doubles. At the same time a heat loss of 7 kJ occurs.
Part A)Determine the final temperature (T2).
Part B)Determine the duration of the process.
Part C)
What-if scenario: What is the final
temperature if the piston-cylinder device initially contains
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