A piston-cylinder device contains 0.1 m³ of refrigerant 134a at 0.24 MPa and 40°C. Initially the piston is fixed with a pin. Heat is transferred now to the refrigerant from a source at 100°C until the pressure rises to 0.28 MPa. Then, heat is given to an environment with a temperature of 25°C 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 50°C. 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

A piston-cylinder device contains 0.1 m³ of refrigerant 134a at 0.24 MPa and 40°C. Initially the piston is fixed with a pin. Heat is transferred now to the refrigerant from a source at 100°C until the pressure rises to 0.28 MPa. Then, heat is given to an environment with a temperature of 25°C 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 50°C. 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

Elements Of Electromagnetics

7th Edition

ISBN:9780190698614

Author:Sadiku, Matthew N. O.

Publisher:Sadiku, Matthew N. O.

ChapterMA: Math Assessment

Section: Chapter Questions

Problem 1.1MA

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Concept explainers

Work and Heat Transfer

It is generally related to thermal engineering which tells about the use, creation, conversion and transfer of heat energy between the systems. It is also considered that to transfer heat from one source to another, transfer of masses is also required. There are various mechanisms by which, transfer of heat takes place i.e. thermal conduction, convection, radiation or by change of phase. All these mechanisms have their own specific features which sometimes occur simultaneously within the same system.

Question

A piston-cylinder device contains 0.1 m³ of refrigerant 134a at 0.24 MPa and
40°C. Initially the piston is fixed with a pin. Heat is transferred now to the refrigerant
from a source at 100°C until the pressure rises to 0.28 MPa. Then, heat is given to an
environment with a temperature of 25°C 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 50°C.
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.

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