Contributions to Key Energy Conversion Technologies and Advanced Methods for Optimum Energy Systems Design and Planning

February 27, 2003 - 12:00pm
Bldg. 90
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This presentation reviews some of EPFL-LENI's recent contributions to advanced cogeneration and heat pump technologies as well as to new system design approaches based on multimodal evolutionar algorithms. In the field of cogeneration, theoretical and experimental results show that gas engines with unscavenged ignition prechambers can, without the need of a catalyst, achieve high efficiencies with reasonable emissions with both natural gas and biogas. Combination with Organic Rankine Cycle (ORC) heat recovery units as well as the present modeling efforts in Solid Oxyd Fuel Cells (SOFC), either alone or in a combined cycle will be briefly mentioned. In the field of heat pumps, a major progress is being introduced with efficient high temperature heat pump to retrofit existing oil and gas boilers. Scroll compressors with an intermediate vapor injection port, the add-on of a booster compressor or two-stage oil-free compressor units are key approaches to reach the goal. In addition two methodological aspects with be presented: a) Results from the so-called environomic optimization of complex energy systems using either single or multi objective optimization (environomic is a contraction for environmental, economical and thermodynamic). b) Discussion of an experiment done in the County of Geneva with the introduction, in the local acceptance procedures, of a requirement for developers to indicate the energy efficiency of their projects as an indicator of sustainability. Professor Daniel Favrat obtained his Master and PhD in Mechanical Engineering from the Swiss Federal Institute of Technology of Lausanne (EPFL). He then worked in several industrial research centers in Canada and in Europe before becoming professor of thermodynamics and director of the Laboratory for Industrial Energy Systems of EPFL in 1988. He is a member of the Swiss academy of engineering sciences, of the Swiss advisory committee for energy research and of the Technology Assessment board of the Swiss Council for Science and Technology. Since January 2001 he is also director of the newly formed Institute of Energy Sciences of EPFL which groups nine different laboratories. For more information about this seminar, please contact: Kristina LaCommare(510) 486-4718

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