The general theory of exergy and practical applications. II  Heatcowork, transformationcowork and exergetic losses
Abstract
The concepts of heatcowork (heat exergy), transformationcowork (transformation exergy) and exergetic loss, which appear in the exergetic evaluation of any system, are examined in detail. Heat cowork, which represents the maximum amount of work obtainable from a given heat energy by means of a reversible cycle, is shown to be the product of the heat energy and the Carnot factor, and its variation with process temperature is considered. Transformation cowork, the maximum amount of work obtainable from the thermodynamic transformation of a system by a reversible cycle, is defined as a function of total effective coenergy and total coenthalphy, and the concept is shown to be useful in the interpretation of closed systems and open systems in stationary or transient regimes. Exergetic loss, which quantitatively represents the reduction of the possibility of obtaining work due to internal, irreversible losses, is shown to be equal to the product of the entropy of internal irreversible processes and temperature, and is examined for cases of dissipation, heat transfer, mixtures and combustion.
 Publication:

Entropie
 Pub Date:
 April 1979
 Bibcode:
 1979Entro..15....3B
 Keywords:

 Energy Transfer;
 Heat Transfer;
 Theoretical Physics;
 Thermodynamics;
 Combustion Physics;
 Energy Dissipation;
 Enthalpy;
 Entropy;
 Gas Dynamics;
 Graphs (Charts);
 Mathematical Models;
 Thermodynamic Cycles;
 Thermodynamic Efficiency;
 Thermodynamics and Statistical Physics