Q2) A piston-cylinder device contains air at initially 1.5 bar and 25°C. The air is first compressed Polytropically to 7 bar, 0.05 m³ with Polytropic exponent of 1.4 then expanded isothermally to the initial pressure, and finally compressed Isobarically to the initial state. Draw the PV diagram of the cycle and then determine: 1. II. The boundary work of the entire cycle (W). Is this a practical cycle? Internal energy change (AU) during the polytropic process. Heat lost or gained (Q) during the isobaric process. III.

Q2) A piston-cylinder device contains air at initially 1.5 bar and 25°C. The air is first compressed Polytropically to 7 bar, 0.05 m³ with Polytropic exponent of 1.4 then expanded isothermally to the initial pressure, and finally compressed Isobarically to the initial state. Draw the PV diagram of the cycle and then determine: 1. II. The boundary work of the entire cycle (W). Is this a practical cycle? Internal energy change (AU) during the polytropic process. Heat lost or gained (Q) during the isobaric process. III.

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

Q2) A piston-cylinder device contains air at initially 1.5 bar and 25°C, The air is first
compressed Polytropically to 7 bar, 0.05 m³ with Polytropic exponent of 1.4 then
expanded isothermally to the initial pressure, and finally compressed Isobarically to the
initial state. Draw the PV diagram of the cycle and then determine:
1.
II.
The boundary work of the entire cycle (W). Is this a practical cycle?
Internal energy change (AU) during the polytropic process.
Heat lost or gained (Q) during the isobaric process.
III.

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