Question

Q.#1: (10 marks) A piston-cylinder device contains 2 m³ of saturated mixture of water at 150 kPa, x = 30%. The piston is free to move. A 110 V electric heater supplies 10 amp of electric current to the system for a certain length of time. At the end of this period the quality of the mixture reaches 90%. Assume the device is stationary and perfectly insulated. Do the following: i) Draw the process on a $P - v$ and $T - v$ diagram ii) Calculate change of volume of the water, m³ iii) Calculate the amount of work produced by the moving piston, kJ iv) Calculate the amount of work supplied to the device, kJ v) Determine the length of time the electric heater was kept on, minutes Given: kPa.$m^3$ = kJ T v P v

          Q.#1:
(10 marks)
A piston-cylinder device contains 2 m³ of saturated mixture of water at 150 kPa, x = 30%. The piston is
free to move. A 110 V electric heater supplies 10 amp of electric current to the system for a certain
length of time. At the end of this period the quality of the mixture reaches 90%. Assume the device is
stationary and perfectly insulated.
Do the following:
i) Draw the process on a $P - v$ and $T - v$ diagram
ii) Calculate change of volume of the water, m³
iii) Calculate the amount of work produced by the moving piston, kJ
iv) Calculate the amount of work supplied to the device, kJ
v) Determine the length of time the electric heater was kept on, minutes
Given: kPa.$m^3$ = kJ
T
v
P
v

Q.#1:
(10 marks)
A piston-cylinder device contains 2 m³ of saturated mixture of water at 150 kPa, x = 30%. The piston is
free to move. A 110 V electric heater supplies 10 amp of electric current to the system for a certain
length of time. At the end of this period the quality of the mixture reaches 90%. Assume the device is
stationary and perfectly insulated.
Do the following:
i) Draw the process on a P - v and T - v diagram
ii) Calculate change of volume of the water, m³
iii) Calculate the amount of work produced by the moving piston, kJ
iv) Calculate the amount of work supplied to the device, kJ
v) Determine the length of time the electric heater was kept on, minutes
Given: kPa.m^3 = kJ
T
v
P
v

Added by Juan J.

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