A piston-cylinder device contains 0.1 m3 of refrigerant 134a at 0.24 MPa and 40ºC. Initially the piston is fixed with a pin. Heat is transferred now to the refrigerant from a source at 100ºC until the pressure rises to 0.28 MPa. Then, heat is given to an environment with a temperature of 25ºC at a constant pressure (the pin is pulled and in this case, the mass of the piston and the masses on it and the pressure created by the atmospheric pressure are equal to the pressure inside the cylinder) the temperature is brought to a temperature of 50ºC. a) Determine the heat and work interaction for each process b) Sketch the P-v and T-s diagrams of the processes with respect to the saturation lines c) Determine the entropy change of the refrigerant 134a during these two processes d) Determine the entropy generation during these processes. Are these processes appropriate to 2. law of thermodynamics, explain
A piston-cylinder device contains 0.1 m3 of refrigerant 134a at 0.24 MPa and 40ºC. Initially the piston is fixed with a pin. Heat is transferred now to the refrigerant from a source at 100ºC until the pressure rises to 0.28 MPa. Then, heat is given to an environment with a temperature of 25ºC at a constant pressure (the pin is pulled and in this case, the mass of the piston and the masses on it and the pressure created by the atmospheric pressure are equal to the pressure inside the cylinder) the temperature is brought to a temperature of 50ºC.
a) Determine the heat and work interaction for each process
b) Sketch the P-v and T-s diagrams of the processes with respect to the saturation lines
c) Determine the entropy change of the refrigerant 134a during these two processes
d) Determine the entropy generation during these processes. Are these processes appropriate to 2. law of
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