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Daniel Favrat

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Publications associées (90)

Electrochemical model of solid oxide fuel cell for simulation at the stack scale. Part II: Implementation of degradation processes

Stefan Diethelm, Daniel Favrat, Jan Van Herle, Arata Nakajo, Pietro Tanasini

The degradation of the electrochemical performance of solid oxide fuel cell (SOFC) devices is a major hurdle to overcome before commercialisation. The interplay between the phenomena and the long testing times complicate the research, which highlights the ...

2011

THEORETICAL STUDY OF THERMALLY DRIVEN HEAT PUMPS BASED ON DOUBLE ORGANIC RANKINE CYCLE: WORKING FLUID COMPARISON AND OFF-DESIGN SIMULATION

Daniel Favrat, Jonathan Demierre

This study deals with a type of thermally driven heat pumps that consists of a reverse Rankine heat pump cycle, the compressor of which is driven by the turbine of a supercritical Organic Rankine Cycle (ORC). The application is residential heating (domesti ...

2011

Electrochemical Model of Solid Oxide Fuel Cell for Simulation at the Stack Scale I. Calibration Procedure on Experimental Data

Stefan Diethelm, Daniel Favrat, Jan Van Herle, Zacharie Wuillemin, Arata Nakajo

Lifetime prediction and improvement of solid oxide fuel cell (SOFC) devices require a reliable electrochemical model that supports the implementation of degradation phenomena. This study comprises two parts. This Part I describes the calibration of an elec ...

2011

Hybrid Cycle SOFC - Inverted Gas Turbine with CO2 Separation

Daniel Favrat, François Maréchal, Emanuele Facchinetti

A new gas turbine-fuel cell Hybrid Cycle is proposed. The fuel cell advantageously operates close or under atmospheric pressure and is fully integrated with the gas turbine that is based on an Inverted Brayton-Joule Cycle. The idea of the invention is to c ...

2011

Investigating Reliability on Fuel Cell Model Identification. Part I: A Design of Experiments Approach

Daniel Favrat, Jan Van Herle, Leonidas Tsikonis

A model-based Design of Experiments method was employed for the optimisation of measurements on a Solid Oxide Fuel Cell (SOFC). Based on a simplified SOFC model, a variation of the D-optimality was used as optimisation criterion for the calculation of opti ...

2011

Numerical Simulations of a Prechamber Autoignition Engine Operating on Natural Gas

Daniel Favrat, Stefan Heyne, Grégory Millot

At our laboratory extensive research has been conducted on the conversion of conventional Diesel cogeneration engines to operation on natural gas and biogas. In the framework of this research, a numerical simulation of a prechamber autoignition gas engine ...

2011

Impact analysis of carbon tax on the renewal planning of energy supply system for an office building

Daniel Favrat, François Maréchal

2010

The effect of real gas on the properties of Herringbone Grooved Journal Bearings

Jürg Alexander Schiffmann, Daniel Favrat

Driven by applications using herringbone grooved bearings lubricated with a gas operating under conditions where the perfect gas assumption is not valid, the real gas effect has been introduced into the existing narrow groove theory. The enhanced model has ...

Elsevier2010

EnerGis: A geographical information based system for the evaluation of integrated energy conversion systems in urban areas

Daniel Favrat, Luc Girardin, François Maréchal, Matthias Dubuis, Nicole Calame

2010

Energy and exergy analysis of a micro-compressed air energy storage and air cycle heating and cooling system

Daniel Favrat, Young Min Kim

Energy storage systems are becoming more important for load leveling, especially for widespread use of intermittent renewable energy. Compressed air energy storage (CAES) is a promising method for energy storage, but large scale CAES is dependent on suitab ...

2010

Design, experimental investigation and multi-objective optimization of a small-scale radial compressor for heat pump applications

Jürg Alexander Schiffmann, Daniel Favrat

The main driver for small scale turbomachinery in domestic heat pumps is the potential for reaching higher efﬁciencies than volumetric compressors currently used and the potential for making the compressor oil-free, bearing a considerable advantage in the ...

2010

Thermo-economic Optimisation of the Heliostat Field of Solar Tower Thermal Power Plants

Daniel Favrat, Germain Augsburger

A method of optimising the thermodynamic and economic performance of heliostat field within a solar tower thermal power plant has been developed. The method includes the generation of a heliostat field given a set of design variables, the assessment of its ...

2010

Conventional and advanced CO2 based district energy systems

Daniel Favrat, Céline Weber

District energy systems can potentially decrease the CO2 emissions linked to energy services, thanks to the implementation of large polygeneration energy conversion technologies connected to buildings over a network. To transfer the energy from these large ...

2010

Environomic multi-objective optimisation of a district heating network considering centralized and decentralized heat pumps

Daniel Favrat, Adam Molyneaux, Geoffrey Basil Leyland

Concern for the environment has been steadily growing in recent years, and it is becoming more common to include environmental impact and pollution costs in the design problem along with construction, investment and operating costs. To economically respond ...

2010

Process modeling and integration of fuel ethanol production from lignocellulosic biomass based on double acid hydrolysis

Daniel Favrat, Martin Gassner, François Maréchal, Zoé Périn-Levasseur, Suping Zhang

Lignocellulosic biomass is considered as one of the most promising feedstocks for producing fuel ethanol because of its global availability and environmental benefits of its use. In this paper, the process of lignocellulosic ethanol production was investig ...

2009

Evaluation of a combined-cycle setup for Solar Tower Power Plants

Daniel Favrat, Germain Augsburger, James Spelling

Simulation of a pure-solar combined-cycle solar thermal power was performed in order to analyse the thermodynamic and economic performance. An open volumetric receiver and packed-bed storage concept was considered. For a 15 MWe power plant, an exergetic ef ...

2009

Simulation of thermal stresses in anode-supported solid oxide fuel cell stacks. Part II: Loss of gas-tightness, electrical contact and thermal buckling

Daniel Favrat, Jan Van Herle, Zacharie Wuillemin, Arata Nakajo

Structural stability issues in planar solid oxide fuel cells arise from the mismatch between the coefficients of thermal expansion of the components. The stress state at operating temperature is the superposition of several contributions, which differ depe ...

2009

Experimental investigation of prechamber autoignition in a natural gas engine for cogeneration

Daniel Favrat, Michael Meier, Stefan Heyne

A novel ignition concept based on autoignition in an unscavanged prechamber is currently being developed at the Laboratory for Industrial Energy Systems (LENI). On a single cylinder test engine a series of experimental runs (CR=8.5-14, =1-1.6, RPM=1150/150 ...

2009

Simulation of Fuel Ethanol Production from Lignocellulosic Biomass

Daniel Favrat, Martin Gassner, François Maréchal, Suping Zhang

Models for hydrolysis, fermentation and concentration process, production and utilization of biogas as well as lignin gasification are developed to calculate the heat demand of ethanol production process and the amounts of heat and power generated from res ...

2009

Simulation of thermal stresses in anode-supported solid oxide fuel cell stacks. Part I: Probability of failure of the cells

Daniel Favrat, Jan Van Herle, Zacharie Wuillemin, Arata Nakajo

2009

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