Publications by Leonidas Tsikonis

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

Investigating Reliability on Fuel Cell Model Identification. Part III: Behavior of Assessment Criteria and Limits in Identification

Daniel Favrat, Jan Van Herle, Leonidas Tsikonis

The present paper is the third and last part of an investigation on what determines reliability in fuel cell model identification. In continuation to the effect of experimental design (Part I) and a process method for stochastic calculation of a model's pa ...

Wiley-V C H Verlag Gmbh2013

Investigating Reliability on Fuel Cell Model Identification. Part II: An Estimation Method for Stochastic Parameters

Daniel Favrat, Jan Van Herle, Stefan Diethelm, Arata Nakajo, Leonidas Tsikonis

An alternative way to process data from polarization measurements for fuel cell model validation is proposed. The method is based on re- and subsampling of IV data, with which repetitive estimations are obtained for the model parameters. This way statistic ...

Wiley-Blackwell2012

Experimental Real-Time Optimization of a Solid Oxide Fuel Cell Stack via Constraint Adaptation

Dominique Bonvin, Grégory François, Arata Nakajo, Zacharie Wuillemin, Gene Bunin, Leonidas Tsikonis

The experimental validation of a real-time optimization (RTO) strategy for the optimal operation of a solid oxide fuel cell (SOFC) stack is reported in this paper. Unlike many existing studies, the RTO approach presented here utilizes the constraint-adapta ...

2012

Robust Real-Time Optimization of a Solid Oxide Fuel Cell Stack

Dominique Bonvin, Jan Van Herle, Alejandro Gabriel Marchetti, Benoît Chachuat, Arata Nakajo, Zacharie Wuillemin, Leonidas Tsikonis

On-line control and optimization can improve the eﬃciency of fuel cell systems whilst simultaneously ensuring that the operation remains within a safe region. Also, fuel cells are subject to frequent variations in their power demand. This paper investigate ...

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

Approaches on the Thermal Management and Parameter Estimation of Solid Oxide Fuel Cells and their Systems

Leonidas Tsikonis

Solid Oxide Fuel Cells (SOFCs) are electrochemical devices that convert chemical energy from fuel directly into electrical and thermal energy. They present high electrical efficiency and because of this feature they are considered to be an important power ...

EPFL2011

Experimental Real-Time Optimization of a Solid Oxide Fuel Cell Stack via Constraint Adaptation

Dominique Bonvin, Grégory François, Arata Nakajo, Zacharie Wuillemin, Gene Bunin, Leonidas Tsikonis

The experimental validation of a real-time optimization (RTO) strategy for the optimal operation of a solid oxide fuel cell (SOFC) stack is reported in this paper. Unlike many existing studies, the RTO approach presented here utilizes the constraint-adapta ...

2010

The error in gas temperature measurements with thermocouples. Application on an SOFC system Heat Exchanger

Jan Van Herle, Leonidas Tsikonis

We develop a mathematical model and simulate the measurement of gas temperatures as applied by insertion of a thermocouple into a gas stream in order to integrate this model in a model that simulates the Heat Exchanger of an SOFC system. The model is valid ...

2010