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Daniel Favrat

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Publications associées (90)

Numerical simulations of a prechamber autoignition cogeneration engine operating on natural gas

Daniel Favrat, Stefan Heyne, Grégory Millot

A numerical model for a prechamber autoignition gas engine under development has been established based on an experimental test case. With a simplified finiterate/ eddy-dissipation model for the combustion of natural gas, it was possible to properly reprod ...

2009

Experimental investigation of a direct driven radial compressor for domestic heat pumps

Jürg Alexander Schiffmann, Daniel Favrat

The presence of oil in domestic heat pumps is an obstacle toward higher efﬁciency, particularly for enhanced surface evaporators and for advanced concepts based on two- stage cycles. Very compact direct driven radial compressors supported on oil-free beari ...

2009

Energy storage systems

Daniel Favrat, Alfred Rufer, Philippe Barrade

Different types of energy storage systems are described, in particular hydro-pneumatic storage systems. In one, energy is stored by compressing gas in a chamber (44,45,54,55) with a liquid piston and released by gas expansion. A spray head or grid at the t ...

2008

Low power ORC-ORC systems for heat pump applications

Daniel Favrat, Jonathan Demierre

This paper presents a study of a residential (about 20kW) ORC-ORC (Organic Rankine Cycle) thermally driven heat pump. The system works with three different temperature levels similar to absorption heat pumps. The proposed concept is a hermetic system using ...

2008

Development of a natural gas reaction mechanism for engine simulations based on rapid compression machine experiments using a multi-objective optimisation strategy

Daniel Favrat, Stefan Heyne

The ignition delay times of CH4/C2H6/C3H8 mixtures representative of an average natural gas composition have been measured in a rapid compression machine (RCM) at the University of Lille. The pressure at the end of compression (EOC) varied from 13 to 21 ba ...

2008

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

Following the pioneering work of the AGS Tokyo half project, a geographical information system has been developed to model the energy requirements of an urban area. The purpose of the platform is to model with sufficient detail the energy services requirem ...

2008

Modeling and Study of the Influence of Sealing on a Solid Oxide Fuel Cell

Daniel Favrat, Jan Van Herle, Zacharie Wuillemin, Arata Nakajo, Minh-Tâm Luong, Nordahl Autissier

The properties of sealing materials are important for the performance and reliability of solid oxide fuel cells (SOFCs). Even if the properties of a sealing material can be studied separately, it remains difficult to quantify the effect of an imperfect sea ...

2008

Impact Analysis of Carbon Tax on the Renewal Planning of Energy Supply System for an Office Building

Daniel Favrat, François Maréchal

An optimal planning method is proposed for the renewal planning problem of an energy supply system installed into building from economic viewpoint. In this method, the objective function to be minimized is the average annual total cost during the evaluatio ...

2008

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 ...

2008

Multi-objective thermoeconomic optimisation of the design of heliostat field of solar tower power plants

Xavier Pelet, Daniel Favrat

Solar thermal power plants have a large potential, particularly in the sun belt countries around the world. The objectives of this study are to identify the heliostat fields for solar tower plants with the lowest specific energy cost and to investigate the ...

2007

Evaluation of Natural Gas Combined Cycle Plants in China through Environomic Modeling and Multi-objective Optimization

Daniel Favrat, Hongtao Li, François Maréchal

Due to the requirements of lower capital investment, higher operational flexibility, and the pressures from environmental legislations on local pollutants and global greenhouse gases (GHGs) emissions, power generation market is in favour of natural gas bas ...

2007

Conventional and advanced district energy systems

Daniel Favrat, Céline Weber

District energy systems have the potential to decrease the CO2 emissions linked to energy services (heating, hot water, cooling and electricity), thanks to the implementation of large polygeneration energy conversion technologies, connected to a group of b ...

Universita degli Studi di Padova2007

Environomics: An integrated vision of energy, environment and economics

Daniel Favrat

The World is facing major challenges regarding environmental threats, resource constraints and the large unbalance of wealth among developing and developed countries. Energy engineering is at the core of the actions to be undertaken to meet these challenge ...

2007

Thermo-economic Optimization of a Solid Oxide Fuel Cell, Gas Turbine Hybrid System

Daniel Favrat, Jan Van Herle, Francesca Palazzi, François Maréchal, Nordahl Autissier

Large scale power production benefits from the high efficiency of gas-steam combined cycles. In the lower power range, fuel cells are a good candidate to combine with gas turbines. Such systems can achieve efficiencies exceeding 60%. High temperature Solid ...

2007

Scroll expander Organic Rankine Cycle (ORC) efficiency boost of biogas engines

Daniel Favrat, El Hadj Malick Kane, Benoît Gay

The most common energy application for biogas is on-site power generation using gas engine units. The introduction of a bottoming cycle based on Scroll expander Organic Rankine Cycle (ORC) technology within a biogas plant is of high interest since the exce ...

Università degli Studi Di Padova2007

Local current measurement in a solid oxide fuel cell repeat element

Diego Larrain, Daniel Favrat, Jan Van Herle, Nordahl Autissier

A planar solid oxide fuel cell repeating unit, 50 cm2 in total active electrode size, consisting of an anode supported electrolyte cell bearing two 7 mm holes for fuel and air injection, and contacted to two dense metal current collector plates ...

2007

Methodological Aspects of the Definition of a 2kW Society

Daniel Favrat, Pierre-André Haldi

The consumption of primary energy is often used to compare energy systems from a sustainability viewpoint at regional, national or even world level. For such comparisons to be “fair” and meaningful, this implies however to define primary energies in a cohe ...

2006

The challenge of introducing an exergy indicator in a local low on energy

Daniel Favrat, François Maréchal

Extending the idea of exergy to practitioners and policy makers is still a major challenge. Recently the "Canton of Geneva" in Switzerland introduced a new law governing the procedures of attribution of building permits for new or retrofitted city areas. A ...

2006

Can steam play a role in low to medium power from low temperature heat?

Daniel Favrat, Jonathan Demierre, François Maréchal

Rankine cycles for low to medium power and low temperature heat using water as working fluid, were almost written off. The main arguments speaking against them are reviewed in this paper and the conceptual design of the equipment entirely revisited. An adv ...

2006

Simulation of SOFC stack and repeat elements including interconnect degradation and anode reoxidation risk

Diego Larrain, Daniel Favrat, Jan Van Herle

Reliability of SOFC stacks is a complex and key issue. This paper presents a simulation study including some degradation processes, namely, interconnect degradation and the anode reoxidation potential. Quantification for these phenomena has been included i ...

2006

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