LowExergy - The concept of exergy in energy economic analyses (IEA ECBCS Annex 49)

(Austrian Contribution to IEA ECBCS Annex 49)
Contact:Lukas Kranzl
Project Team:Friedrich Diesenreiter, Lukas Kranzl, Andreas Müller
Jun 2008
17 months
Consortium:Fraunhofer-Institute of Buildings Physics
Homepage: www.annex49.com
Further Project information:
PDF File
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Within the last decades, a broad discussion about the integration of the exergy concept into energy economics analyses has evolved in the international scientific community. This exergy based approach provides a better and deeper understanding of the quality of energy flows and thus can contribute to more effective measures for energy saving and climate mitigation. For example, the exergy content which is needed for heating or cooling of buildings is quite low. However, a huge amount of fossile based energy carriers with very high exergy content is used for supplying this low exergy demand. In Austria, the application and discussion of the exergy concept currently is restricted to a few areas like thermodynamic analyses. A broader utilization of such research activities in Austria could lead to an increased publicity of the exergy concept within Austria and thus to a deeper understanding of the quality of different energy carriers as well as energy demand areas.

The participation of Vienna University of Technology, Energy Economics Group (EEG) in Annex 49 of the implementing agreements ECBCS (Energy Conservation in building and community systems) contains research activities within the following areas:

  • Analysis of cost efficiency of LowEx systems
  • Exergetic analysis of long-term scenarios in the Austrian space heating sector
  • Exergetic analysis of renewable energy systems (in particular bioenergy, including polygeneration)
Moreover, EEG contributes to the following ascpects of annex 49: system optimisation strategies, best practice examples for buildings and communities in Austria and dissemination activities.
last update: 2008-05-06

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