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2 - Energy and Exergy: Does One Need Both Concepts for a Study of Resources Use?

Published online by Cambridge University Press:  01 June 2011

By
Dušan P. Sekulić
Edited by
Bhavik R. Bakshi ,
Timothy G. Gutowski  and
Dušan P. Sekulić
Dušan P. Sekulić
Affiliation:
University of Kentucky
Bhavik R. Bakshi
Affiliation:
Ohio State University
Timothy G. Gutowski
Affiliation:
Massachusetts Institute of Technology
Dušan P. Sekulić
Affiliation:
University of Kentucky
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Summary

Introduction

In Chapter 1, the concepts of thermodynamics were introduced, and a consistent exposition of thermodynamics' basic laws and associated system properties was offered. Out of an infinite set of properties and a limited number of defined interactions, only a few are relevant in any given study, and these include a limited number of independent system properties. This chapter is devoted to a further elaboration of two such fundamental concepts that belong to a class of system properties: (1) energy and (2) exergy. The main purpose of this exposition is threefold: (1) to offer a discussion of physical meanings of these concepts; (2) to present their analytical structure within the traditional thermodynamics framework; which is useful for applications; and (3) to emphasize the importance of balancing them. These topics are relevant for a variety of situations in diverse fields of interest, all identifiable in complex systems involving destruction of resources.

The notion of a concept is used to describe abstract theoretical constructs of classical thermodynamics theory. The concept of energy [1] is reintroduced in this chapter by means of a notion of a change of a system property; the concept of exergy [2] is reintroduced by means of the magnitude of an energy interaction. This magnitude would be expressed in energy units, but would be measured as an interaction extracted from the system changing the state between the given state and the state of thermodynamic equilibrium with the referent surroundings.

Type
Chapter
Information
Thermodynamics and the Destruction of Resources , pp. 45 - 86
Publisher: Cambridge University Press
Print publication year: 2011

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