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A two-phase, liquidvapor mixture of H2O, initially at x 5
Chapter 3, Problem 3.77(choose chapter or problem)
A two-phase, liquid–vapor mixture of \(\mathrm{H}_{2} \mathrm{O}\), initially at x = 30% and a pressure of 100 kPa, is contained in a piston– cylinder assembly, as shown in Fig P3.77. The mass of the piston is 10 kg, and its diameter is 15 cm. The pressure of the surroundings is 100 kPa. As the water is heated, the pressure inside the cylinder remains constant until the piston hits the stops. Heat transfer to the water continues at constant volume until the pressure is 150 kPa. Friction between the piston and the cylinder wall and kinetic and potential energy effects are negligible. For the overall process of the water, determine the work and heat transfer, each in kJ.
Questions & Answers
QUESTION:
A two-phase, liquid–vapor mixture of \(\mathrm{H}_{2} \mathrm{O}\), initially at x = 30% and a pressure of 100 kPa, is contained in a piston– cylinder assembly, as shown in Fig P3.77. The mass of the piston is 10 kg, and its diameter is 15 cm. The pressure of the surroundings is 100 kPa. As the water is heated, the pressure inside the cylinder remains constant until the piston hits the stops. Heat transfer to the water continues at constant volume until the pressure is 150 kPa. Friction between the piston and the cylinder wall and kinetic and potential energy effects are negligible. For the overall process of the water, determine the work and heat transfer, each in kJ.
ANSWER:
Step 1 of 6
The following are given from the question.
Diameter of the piston,
Mass of the piston,
Initial distance of piston from the close end of cylinder,
Final distance of piston from the close end of cylinder,
Initial pressure,