Publications by Sylvain Lemofouet-Gatsi

On The Strategies Towards Isothermal Gas Compression And Expansion

Alfred Rufer, Sylvain Lemofouet-Gatsi, Mahbod Heidari

Isothermal compression/expansion is regarded as the most promising process in many applications and many researchers and inventors have tried different methods to achieve this goal. The current article first studies the gradual roadmap from adiabatic towar ...

2014

Driving and Filling Personal Vehicles – The Questions of Energy - and Power - Density ( A Fast Filling Station for the Compressed Air Car )

Alfred Rufer, Sylvain Lemofouet-Gatsi, Arnaud Leuba, Mahbod Heidari

In the context of the development of zero emissions personal vehicles, compressed air cars have been proposed, as alternative solutions to electric solutions, with a small energy content leading to a limited range, but with interesting properties regarding ...

2011

L'air comprimé pour stocker l'énergie : une solution prometteuse

Sylvain Lemofouet-Gatsi

Une Spin-off de l'EPFL réinvente le stockage hydropneumatique d'énergie pour parvenir à une exploitation plus efficace et écologique des sources renouvelables intermittentes. ...

2008

Stockage d'énergie par air comprimé. Un défi pour les circuits d'électronique de puissance

Alfred Rufer, Sylvain Lemofouet-Gatsi

The principle of air compression can be utilized for the storage of electrical energy, with variable properties from the point of view of the energy efficiency. For the involved thermodynamic phenomena different approaches and realized systems lead to more ...

2007

Efficiency Considerations and Measurements of a Hybrid Energy Storage System based on Compressed Air and Supercapacitors

Alfred Rufer, Sylvain Lemofouet-Gatsi

This paper presents the study and experimentation of a hybrid energy storage system based on Compressed Air, where the storage and discharge are done within maximum efficiency conditions for the volumetric machine. As these maximum efficiency conditions im ...

2007

Multichannel DC-DC Converter’s Efficiency Optimisation by variable Number of active Channels

Alfred Rufer, Sylvain Lemofouet-Gatsi, Lukas Fleischli

In the context of energy storage with supercapacitors, the so called round trip efficiency is an important factor that can be strongly affected by the characteristics or performances of the used converter. This paper presents a dedicated DC-DC converter, w ...

2006

Energetic Performance of a Hybrid Energy Storage System based on Compressed Air and Super Capacitors

Alfred Rufer, Sylvain Lemofouet-Gatsi

This paper presents a study and experimentation of a hybrid energy storage system prototype, based on Compressed Air, where the charging and discharging is done within maximum efficiency conditions of the volumetric machine. As the maximum efficiency condi ...

2006

Hybrid Energy Storage System Based on Compressed Air and Super-Capacitors with Maximum Efficiency Point Tracking (MEPT)

Alfred Rufer, Sylvain Lemofouet-Gatsi

This paper presents a hybrid energy storage system mainly based on Compressed Air, where the storage and withdrawal of energy are done within maximum efficiency conditions. As these maximum efficiency conditions impose the level of converted power, an inte ...

2006

Stockage d'énergie par air comprimé: un défi pour les circuits d'électronique de puissance

Alfred Rufer, Sylvain Lemofouet-Gatsi

Le principe de la compression de l’air peut être utilisé pour le stockage de l’énergie électrique, avec des performances très variables du point de vue du rendement énergétique. Dans le domaine des phénomènes thermodynamiques impliqués, différentes approch ...

2006

A Hybrid Energy Storage System Based on Compressed Air and Super Capacitors With Maximum Efficiency Point Tracking (MEPT)

Alfred Rufer, Sylvain Lemofouet-Gatsi

In addition to the high-capacity storage facilities based on hydropower technologies, electrochemical solutions are today’s candidate for storage for renewable energy sources support. However, sustainability and limited life cycles of batteries are often i ...

2006

Investigation and optimisation of hybrid electricity storage systems based on compressed air and supercapacitors

Sylvain Lemofouet-Gatsi

An increasing recourse to renewable energies is one of the key solutions to address the current resource and environmental concerns related to the world energy supply. Because of the distributed and intermittent nature of several of them (Solar, Wind), an ...

EPFL2006

Multichannel DC-DC Converter’s Efficiency Optimisation by variable Number of active Channels

Alfred Rufer, Sylvain Lemofouet-Gatsi, Lukas Fleischli

In the context of energy storage with supercapacitors, the so called round trip efficiency is an important factor that can be strongly affected by the characteristics or performances of the used converter. This paper presents a dedicated DC-DC converter, w ...

2006

Efficiency Considerations and Measurements of a Hybrid Energy Storage System based on Compressed Air and Super Capacitors

Alfred Rufer, Sylvain Lemofouet-Gatsi

This paper presents a study and experimentation of a hybrid energy storage system prototype, based on Compressed Air, where the charging and discharging is done within maximum efficiency conditions of the volumetric machine. As the maximum efficiency condi ...

2006

Hydro-pneumatic Energy Storage Systems for Renewable Sources Support: Principle, Efficiency Optimisation, Possible topologies

Alfred Rufer, Sylvain Lemofouet-Gatsi

1 Principle of Pneumatic Energy Storage 2 Optimisation of the Pneumatic-to-Mechanical Energy Conversion 4 Strategy for Power Flexibility: Hybrid Storage 5 Overall Efficiency and Possible Topologies 6 Economical Considerations ...

2006

Principle of Hybrid Energy Storage Systems based on Hydro-pneumatics and Supercapacitors for Distributed Generation and Renewable Energy Sources Support

Alfred Rufer, Sylvain Lemofouet-Gatsi

This paper presents hybrid energy storage systems based on hydro-pneumatics and Supercapacitors with high potentials regarding life cycle and impacts on environment. These so called “Batteries with Oil-hydraulics and Pneumatics (BOP)” systems exploit the h ...

2005

Hybrid Energy Storage Systems based on Compressed Air and Supercapacitors with Maximum Efficiency Point Tracking

Alfred Rufer, Sylvain Lemofouet-Gatsi

Beside the high-capacity storage facilities based on hydro-power technologies, electrochemical solutions are the today's candidate for storage for renewable energy sources. However, limited life-cycles and sustainability of batteries are often inhibiting f ...

2005

Hybrid Energy Storage System based on Compressed Air and Super Capacitors with MEPT (Maximum Efficiency Point Tracking)

Alfred Rufer, Sylvain Lemofouet-Gatsi

This paper presents a hybrid energy storage system based on Compressed Air Energy Storage (CAES), where the charging and discharging is done within maximum efficiency conditions. As the maximum efficiency conditions impose the level of converted power, an ...

2005

A hybrid energy storage system based on compressed air and supercapacitors with maximum efficiency point tracking

Alfred Rufer, Sylvain Lemofouet-Gatsi

This paper presents a hybrid energy storage system based on Compressed Air Energy Storage (CAES), where the extraction of energy is done within maximum efficiency conditions. As the maximum efficiency conditions impose the level of converted power, an inte ...

2004

Principle of a hybrid Compressed Air and Supercapacitors Energy Storage system with Maximum Efficiency Point Tracking

Félix Grasser, Alfred Rufer, Philippe Barrade, Sylvain Lemofouet-Gatsi

This paper presents a hybrid energy storage system based on Compressed Air Energy Storage (CAES), where the extraction of energy is done within maximum efficiency conditions. As the maximum efficiency conditions impose the level of converted power, an inte ...

2003