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L'optimisation du dimensionnement et des modes opératoires des systèmes énergétiques intégrés est une tâche de plus en plus complexe dans le contexte d'un marché de l'énergie en voie de libéralisation et d'une législation environnementale de plus en plus stricte. Dans ce travail, une méthode d'optimisation multicritère basée sur le concept de modélisation 'environomique' est proposée. Elle s'appuie sur différents travaux préalables qui ont été menés au sein du 'Laboratoire d'Energétique Industrielle' de l'Ecole Polytechnique Fédérale de Lausanne. La méthodologie est appliquée ici à l'évaluation de systèmes de génération d'électricité et de cogénération pour un dimensionnement et une opération optimaux selon les critères de coût et d'émission de CO2. Elle est destinée aux concepteurs de technologies de génération d'électricité et de cog...
information sharing, confidentiality, signaling, supply chain coordination, truth telling
We provide a brief overview of the advances in ab initio thermodynamic studies on metal/oxide interfaces in this paper. Firstly, the development in interface modeling is briefly outlined. Secondly, the fundamentals of ab initio thermodynamic method are described. Thirdly, ab initio thermodynamic studies on several typical interfaces between alumina and metals including alloys are presented, especially for the interfaces between α-Al 2 O 3 and Nb, Ni, Cu, and β-Ni 1− x Al x alloy. Finally, through analyzing electronic structure, chemical bonding, and adhesion of the interfaces between α-Al 2 O 3 and a series of metals, including Al, Ni, Cu, Au, Ag, Rh, Ir, Pd, Pt, Nb, and β-NiAl, a formally unified model is derived for evaluating the works of separation of the representative aluminum-rich, oxygen-rich, and stoichiometric met...
vermiculture, macro-agriculture, sludge stabilisation, circular economy, earthworm composting, earthworms, vermicomposting, organic waste,
A more widespread usage of heat pumps would contribute to significantly reduce both local and global environmental impacts. This is particularly relevant within cities, where advanced integrated energy systems incorporating heat pumps and associated with district heating networks offer interesting opportunities for CO2 emissions abatement. Planning for medium or long term investments in an unsettled economic and regulatory environment in particular with regards to global environmental issues and accounting for the technical evolution requires the ability to deal with a large number of parameters. This paper illustrates through the case study of a district heating in the city of Beijing the ongoing efforts towards multi- criteria optimization of advanced energy systems in order to provide decision makers with a coherent techno...
In this series of two articles, the concepts and approaches of environomic (thermodynamic, economic and environmental) performance ‘Typification’ of power generation technologies (Part I) and of combined heat and power (CHP) cogeneration technologies (Part II) in the context of CO2 abatement are introduced. A methodology is then proposed for a flexible and fast project based power or CHP cogeneration system design evaluation though post-optimization integration of the operating and capital costs. This allows to effectively deal with the uncertainty of the project specific design and operation conditions (fuel, electricity and heat selling prices, project financial conditions such as investment amortization periods, annual operating hours, etc). Furthermore, the uncertainties linked to the external cost such as the CO2 tax level under ...
This is the second of a series of two articles, dealing with a new approach of environomic (thermodynamic, economic and environmental) performance Typification and optimization of power generation technologies. This part treats specifically of combined heat and power (CHP) cogeneration technologies in the context of CO2 abatement and provides a methodology for a flexible and fast project based CHP system design evaluation. One of the aspect of the approach is the post-optimization integration of the operating and capital costs, in order to effectively deal with the uncertainty of the project specific design and operation conditions (fuel, electricity and heat selling prices, project financial conditions such as investment amortization periods, annual operating hours, etc). In addition the approach also allows to efficiently evaluate th...
A new nominal uncut chip thickness algorithm for micro-scale end-milling is proposed by considering the combination of an exact trochoidal trajectory of the tool tip and tool run-out, and then the actual uncut chip thickness may be obtained from a comparison between the current accumulative uncut chip thickness and the minimum chip thickness. Due to the intermittency of the chip formation, the milling process is divided into an elastic-plastic deformation regime and a chip formation regime dominated by ploughing forces and shearing forces, respectively, and three-dimensional cutting forces are modeled according to different regimes. Based on the modeling and simulation technologies introduced, a simulation system for the prediction of three-dimensional cutting forces of a micro-scale end-milling process is developed. The simulation res...
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