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Environment, Development and Sustainability

, Volume 11, Issue 5, pp 971–988 | Cite as

Exergy for better environment and sustainability

  • Mehmet Kanoglu
  • Ibrahim Dincer
  • Yunus A. Cengel
Article

Abstract

In this paper, some key aspects and definitions of exergy are presented, and practical examples are given in order to highlight its usefulness in design, analysis and performance improvement for various types of energy processes for better environment and sustainable development. The relations between exergy, sustainability and environmental impact are illustrated to show how improving the performance of the process through exergy efficiency affects the environmental impact and sustainable development. Both exergy and energy efficiencies for various systems/processes are also studied for comparison purposes.

Keywords

Exergy Energy Efficiency Performance Environment and sustainability 

Nomenclature

cp

Specific heat (kJ/kg·K)

COP

Coefficient of performance

E

Energy (kJ)

Ex

Amount of exergy (kJ)

Exdestroyed

Exergy destruction (kJ)

\( \dot Ex \)

Rate of exergy (kW)

h

Enthalpy (kJ/kg)

m

Mass (kg)

\( \dot m \)

Mass flow rate (kg/s)

N

Mole number (kmol)

P

Pressure (kPa)

Q

Amount of heat transfer (kJ)

\( \dot Q \)

Rate of heat transfer (kW)

s

Entropy (kJ/kg · K)

Sgen

Entropy generation (kJ/K)

T

Temperature (kJ/kg)

Taf

Adiabatic flame temperature (K)

u

Internal energy (kJ/kg)

v

Specific volume (m3/kg)

V

Volume (m3)

\( \dot V \)

volume flow rate (m3/s)

W

Amount of work (kJ)

\( \dot W \)

Rate of work or power (kW)

Greek letters

ηth

Thermal efficiency

ηex

Exergy (second-law) efficiency

ψ

Flow exergy (kJ/kg)

Notes

Acknowledgement

The authors are grateful for the support provided for this work by the Natural Sciences and Engineering Research Council of Canada.

References

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Copyright information

© Springer Science+Business Media B.V. 2008

Authors and Affiliations

  • Mehmet Kanoglu
    • 1
  • Ibrahim Dincer
    • 2
  • Yunus A. Cengel
    • 3
  1. 1.Department of Mechanical EngineeeringUniversity of GaziantepGaziantepTurkey
  2. 2.Faculty of Engineering and Applied ScienceUniversity of Ontario Institute of TechnologyOshawaCanada
  3. 3.Department of Mechanical EngineeeringUniversity of Nevada, RenoRenoUSA

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