Answered: Determine the work during the expansion…

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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Determine the work during the expansion of 0.5kg of air from 8 bar and 0.2m3/kg to 1bar according to pv 1.4=cte Present the process in pv Interpret the Labor sign Graph

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Step 1

Introduction

The expansion process is the work-producing process in which useful work is obtained by the volume expansion of gasses. The adiabatic work is obtained by considering the initial pressure volume and final pressure volume in the rectangular hyperbolic curve.

Given data:

$\begin{array}{rcl} mass of the air (m) & = & 0.5 kg \\ initial pressure (P_{1}) & = & 8 bar \\ final pressure (P_{2}) & = & 1 bar \\ specific volume (v) & = & 0.2 m^{3} / kg \\ polytropic index (n) & = & 1.4 \end{array}$

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