1) Air, treated as an ideal gas, goes through a polytropic process from 125 kPa, 325 K to 300 kPa and 500 K. Find: a) the polytropic exponent 'n' b) the specific work in kJ/kg for the process. Comment on the work sign. Show the process on P-U diagram.

1) Air, treated as an ideal gas, goes through a polytropic process from 125 kPa, 325 K to 300 kPa and 500 K. Find: a) the polytropic exponent 'n' b) the specific work in kJ/kg for the process. Comment on the work sign. Show the process on P-U diagram.

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

1) Air, treated as an ideal gas, goes through a polytropic process from 125 kPa, 325 K to 300 kPa
and 500 K. Find:
a) the polytropic exponent 'n'
b) the specific work in kJ/kg for the process. Comment on the work sign.
c) Show the process on P-U diagram.

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Step 2: Calculate the polytropic exponent 'n'

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Step 3: Calculate the specific work in kJ/kg for the process.

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