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Daniel Favrat

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Publications associées (88)

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

François Maréchal, Daniel Favrat

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

Exergy representations in thermodynamics

François Maréchal, Daniel Favrat

The paper reviews various representations of exergy and exergy losses in energy systems going from simple heat exchanger (heat transfer, dissipation and embedded exergy) to the exergy of full energy systems from fossil or non fossil resources (including th ...

2015

Simulation of Fuel Ethanol Production from Lignocellulosic Biomass

François Maréchal, Daniel Favrat, Martin Gassner

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

Thermoeconomic optimization of a combined-cycle solar tower power plant

Daniel Favrat, Germain Augsburger

A dynamic model of a pure-solar combined-cycle power plant has been developed in order to allow determination of the thermodynamic and economic performance of the plant for a variety of operating conditions and superstructure layouts. The model was then us ...

2012

Experimental investigation of a Thermally Driven Heat Pump based on a double Organic Rankine Cycle and an oil-free Compressor-Turbine Unit

Daniel Favrat, Jürg Alexander Schiffmann, Jonathan Demierre

This paper presents the experimental investigation of a concept of Thermally Driven Heat Pump (TDHP), based on the coupling of a vapor compression heat pump cycle and an Organic Rankine Cycle (ORC). The studied concept uses a single stage centrifugal compr ...

Elsevier2014

Improving performances of a lean burn cogeneration biogas engine equipped with combustion prechambers

Daniel Favrat

Test of the unscavenged prechamber ignition system on a 150kW cogeneration engine fed with biogas are presented. The objective was to reach at least 36% in fuel conversion efficiency with exhaust gas emissions lower than the Swiss regulations limits (NOx, ...

2005

Novel district heating and cooling energy network using CO2 as a heat and mass transfer fluid

François Maréchal, Daniel Favrat, Luc Girardin, Samuel Henchoz

Compact district energy networks in a temperature range of 10 to 16°C have a great potential for energy savings by providing a heat source for decentralized heating heat pumps, a cold source for air-conditioning and a heat sink for refrigeration or cogener ...

2017

Numerical Simulations of a Prechamber Autoignition Engine Operating on Natural Gas

Daniel Favrat, Stefan Heyne

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

Methodology for Identification of Suitable ORC-Cycle and Working-Fluid using Integration with Multiple Objectives

François Maréchal, Daniel Favrat, Matthias Bendig

In recent times the interest in electricity production with Organic Rankine Cycles (ORC) has increased. A look into recent publications shows that the identification of suitable working fluids is in general done by a look at a more or less small number of ...

Aidic Servizi Srl2014

Transcritical or supercritical CO2 cycles using both low- and high-temperature heat sources

Daniel Favrat

In CO2 cycles with high-temperature heat sources that are used in applications such as nuclear power, concentrated solar power, and combustion, partial condensation transcritical CO2 (T-CO2) cycles or recompression supercritical CO2 (S-CO2) cycles are cons ...

2012

Performance and Profitability Perspectives of a CO2 based District Energy Network in Geneva’s City Center

Daniel Favrat, Samuel Henchoz, Céline Weber

A new type of district energy network capable of providing simultaneously heating and cooling is being investigated. It is based on the use of CO2 as a heat transfer fluid by taking advantage of the latent heat of vaporization, to store and transfer heat a ...

2012

District heating and cooling energy network using CO2 as a heat and mass transfer fluid

François Maréchal, Daniel Favrat, Luc Girardin, Samuel Henchoz

The 5th generation compact district heating and cooling networks in a temperature range of 10 to 16 °C have a great potential for energy savings by providing a heat source for decentralized heating heat pumps, a cold source for air-conditioning and a heat ...

2018

The information platform energyscope.ch on the energy transition scenarios

François Maréchal, Daniel Favrat, François Richard Vuille, Victor Codina Gironès

Switzerland like many countries plans to undertake an energy transition and the government proposes different paths for 2035 and 2050 to achieve it. However the authors of this paper felt the need for a better information of the public on the energy matter ...

2016

Dynamic Modeling and Simulation of Two-stage Compression Heat Pumps with Flash Economizer

Daniel Favrat, Samuel Henchoz, Simon Gailledrat, Jean-Baptiste Carré

Multistage heat pumps are one of the most efficient technologies for delivering heat at temperatures below 100°C, Thanks to their fairly high exergy efficiency. In the recent years the development of radial compressors mounted on gas bearings have unlock t ...

2013

Progressive activation of degradation processes in solid oxide fuel cells stacks: Part I: Lifetime extension by optimisation of the operating conditions

Jan Van Herle, Daniel Favrat, Arata Nakajo

The degradation of solid oxide fuel cells (SOFC) depends on stack and system design and operation. A methodology to evaluate synergistically these aspects to achieve the lowest production cost of electricity has not yet been developed. A repeating unit mod ...

Elsevier2012

Prototype of a thermally driven heat pump based on integrated organic Rankine cycles (ORC)

Daniel Favrat, Samuel Henchoz, Jonathan Demierre

The concept studied in this work is a low power ORC-ORC system (about 20 kW heat at the condenser) which is composed of an ORC engine cycle driving a reversed ORC heat pump cycle, both using the same fluid. The radial compressor and turbine are directly co ...

2012

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

Experimental investigation of a two-stage oil-free domestic Air/Water heat pump prototype powered by an oil-free high-speed twin-stage radial compressor rotating on gas bearings

Daniel Favrat, Jürg Alexander Schiffmann, Jean-Baptiste Carré

Domestic heat pumps have been identified as a key-technology to decrease the energy consumption of the domestic sector, which represents 29% of the world final energy consumption. Space & water heating represent more than two third of the domestic sector e ...

2016

Advanced Power Plant Design Methodology using Process Integration and Multi-Objective Thermo-Economic Optimisation

François Maréchal, Daniel Favrat, Raffaele Bolliger

Thermo-economic modelling techniques are well known techniques to optimise power plant designs. These methods are usually based on the definition of a superstructure that includes the major options of the design. If this approach has proved to be appropria ...

2005

From thermoeconomics to environomics and beyond

Daniel Favrat

Modern energy systems are more and more based on integrated technologies in a world evolving towards increasing concerns not only for economics but also for environmental issues with a growing focus on resources and emissions. In parallel, information tech ...

2024