Propane contained inside a closed piston-cylinder device undergoes four processes. Process 1 to 2: A constant...

 

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Propane contained inside a closed piston-cylinder device undergoes four processes. Process 1 to 2: A constant temperature process from an absolute pressure of 4 bar and a temperature of 0C (State 1) to saturated vapor (State 2) Process 2 to 3: A constant pressure process to saturated liquid-vapor mixture of quality 0.3 (State 3) Process 3 to 4: A constant volume process to an absolute pressure of 10 bar (State 4) Process 4 to 5: A constant pressure process to a temperature of 0C (State 5) (a) Calculate the specific entropy generation for each process, in kJ/kg-K. Assume that the cylinder wall in contact with the fluid remains at a constant boundary temperature of -10C for heat transfer out of the fluid and at a constant boundary temperature of 30C for heat transfer into the fluid. (b) Show the four processes on T-s diagram relative to the vapor dome and the appropriate lines of constant pressure for the five states. Label states and identify process directions with arrows. For propane: Peritical = 42.5 bar and Tritical = 96.6C. Propane contained inside a closed piston-cylinder device undergoes four processes. Process 1 to 2: A constant temperature process from an absolute pressure of 4 bar and a temperature of 0C (State 1) to saturated vapor (State 2) Process 2 to 3: A constant pressure process to saturated liquid-vapor mixture of quality 0.3 (State 3) Process 3 to 4: A constant volume process to an absolute pressure of 10 bar (State 4) Process 4 to 5: A constant pressure process to a temperature of 0C (State 5) (a) Calculate the specific entropy generation for each process, in kJ/kg-K. Assume that the cylinder wall in contact with the fluid remains at a constant boundary temperature of -10C for heat transfer out of the fluid and at a constant boundary temperature of 30C for heat transfer into the fluid. (b) Show the four processes on T-s diagram relative to the vapor dome and the appropriate lines of constant pressure for the five states. Label states and identify process directions with arrows. For propane: Peritical = 42.5 bar and Tritical = 96.6C.