Publications by Daniel Favrat | EPFL Graph Search

From thermoeconomics to environomics and beyond

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

EXERGY EFFICIENCY IS A KEY PERFORMANCE INDICATOR TO RANK ADVANCED ACTIVE ENERGY TECHNOLOGIES AT THE DISTRICT LEVEL

Daniel Favrat

Supplying electricity, heat and cold is an essential part in the development of more sustainable city districts. Previous papers have illustrated the interest of using the exergy efficiency concept to decompose the problem and rank the technology combinati ...

ECOS 20242024

Sofc system with anode off-gas recirculation

Jürg Alexander Schiffmann, Daniel Favrat, Jan Van Herle, Zacharie Wuillemin, Patrick Hubert Wagner

The present invention concerns an SOFC system comprising an anode off-gas recirculation arrangement in which anode off-gas is pumped by a fan or pump of a coaxial turbine-fan assembly, the system comprising a condenser for condensing water contained in sai ...

2020

Evaluation and recommendation of a subsidy instrument for new large hydropower plants, use case of Switzerland

Daniel Favrat, Massimiliano Capezzali, Mélanie Guittet

2018

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

Daniel Favrat, Luc Girardin, François Maréchal, 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

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

Daniel Favrat, Luc Girardin, François Maréchal, 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

Exergy assessment of future energy transition scenarios with application to Switzerland

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

Using an exergy based indicator is highly desirable to compare future national energy strategies. A new web- based information platform called energyscope.ch, informing the general public on the Swiss energy transition was presented at ECOS2016. This paper ...

2017

Apparatus for salt separation under supercritical water conditions

Daniel Favrat, François Maréchal, Alberto Mian, Adriano Viana Ensinas

Apparatus for salt separation (2) under supercritical water conditions, comprising a heat exchanger (4) and a fluidized bed reactor (6). The fluidized bed reactor comprising a supercritical water pressure containing wall (8) defining therein a fluidized be ...

2016

The information platform energyscope.ch on the energy transition scenarios

Daniel Favrat, François Richard Vuille, François Maréchal, 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

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

Jürg Alexander Schiffmann, Daniel Favrat, 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

Key Energy and Technological Aspects of Three Innovative Concepts of District Energy Networks

Daniel Favrat, François Maréchal, Samuel Henchoz, Patrick Chatelan

Energy needs in urban areas are heterogeneous by their nature, spatial distribution and temperature level required. Three concepts of district energy networks that could provide the energy services efficiently to a city centre are compared. The focus is on ...

2016

Strategic energy planning for large-scale energy systems: A modelling framework to aid decision-making

Daniel Favrat, François Maréchal, Victor Codina Gironès, Stefano Moret

Concerns related to climate change and security of energy supply are pushing various countries to make strategic energy planning decisions. This requires the development of energy models to aid decision- making. Large scale energy models are often very com ...

2015

Key energy and technological aspects of three innovative concepts of District energy networks

Daniel Favrat, François Maréchal, Samuel Henchoz, Patrick Chatelan

In urban areas, the use of thermal energy services is intensive and relatively heterogeneous by their nature, spatial distribution and temperature level required. In this study three concepts of district energy networks that could provide these services ve ...

2015

Exergy representations in thermodynamics

Daniel Favrat, François Maréchal

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

The effect of bias in gas temperature measurements on the control of a Solid Oxide Fuel Cells system

Daniel Favrat, Jan Van Herle, Leonidas Tsikonis, Joel Albrektsson

In this paper the effect of systematic errors in gas temperature measurements on the thermal control of a Solid Oxide Fuel Cell system is demonstrated. Three control schemes were tested under two different conditions. First, the real gas temperature at the ...

Elsevier Science Bv2014

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

Daniel Favrat, François Maréchal, 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

Innovative isothermal oil-free co-rotating scroll compressor-expander for energy storage with first expander tests

Daniel Favrat, Angel Iglesias

The development of an efficient isothermal turbine and compressor is essential for the realization of a small-scale compressed air energy storage (CAES). This article presents the theoretical development of an oil-free co-rotating scroll air compressor and ...

Elsevier2014

Swiss-EnergyScope.ch: a Platform to Widely Spread Energy Literacy and Aid Decision-Making

Daniel Favrat, François Maréchal, Victor Codina Gironès, Stefano Moret

We develop an energy calculator within an online teaching platform to aid citizens and decision-makers understanding an energy system. The model, designed in order to be easily adapted to any energy system at national or regional scale, is presented and ap ...

Aidic Servizi Srl2014

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

Jürg Alexander Schiffmann, Daniel Favrat, Jonathan Demierre, Johannes Wegele

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

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