WH
Authored
6 records found
Ion temperature profile stiffness
Non-linear gyrokinetic simulations and comparison with experiment
Recent experimental observations at JET show evidence of reduced ion temperature profile stiffness. An extensive set of nonlinear gyrokinetic simulations are performed based on the experimental discharges, investigating the physical mechanism behind the observations. The impact o
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Ion temperature profile stiffness
Non-linear gyrokinetic simulations and comparison with experiment
Recent experimental observations at JET show evidence of reduced ion temperature profile stiffness. An extensive set of nonlinear gyrokinetic simulations are performed based on the experimental discharges, investigating the physical mechanism behind the observations. The impact o
...
Ion temperature profile stiffness
Non-linear gyrokinetic simulations and comparison with experiment
Recent experimental observations at JET show evidence of reduced ion temperature profile stiffness. An extensive set of nonlinear gyrokinetic simulations are performed based on the experimental discharges, investigating the physical mechanism behind the observations. The impact o
...
Ion temperature profile stiffness
Non-linear gyrokinetic simulations and comparison with experiment
Recent experimental observations at JET show evidence of reduced ion temperature profile stiffness. An extensive set of nonlinear gyrokinetic simulations are performed based on the experimental discharges, investigating the physical mechanism behind the observations. The impact o
...
Electrolysers, Fuel Cells and Batteries
Analytical Modelling
Electrochemical engineering deals with electrochemical devices like electrolysers, fuel cells, and batteries. While several excellent books exist in this long-standing and still growing field, their focus is usually on chemistry or phenomenology. In this textbook, we focus on ma
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Dynamic operation of water electrolyzers
A review for applications in photovoltaic systems integration
This review provides a comprehensive overview of the dynamics of low-temperature water electrolyzers and their influence on coupling the three major technologies, alkaline, Proton Exchange Membrane (PEM) and, Anion Exchange Membrane (AEM) with photovoltaic (PV) systems. Hydrogen
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Contributed
14 records found
Flexible Alkaline Water Electrolysis
Flexibility limitations for transient electrolyzer operation
A numerical model is developed in Simulink to simulate transient alkaline electrolyzer operation. The model is built to simulate a large scale hydrogen plant in Rjukan, Norway. The model is based on physical relations where available, some plant-specific data is modeled using emp
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Bubble Quantification
In the near electrode region in alkaline water electrolysis
Alkaline water electrolysis holds significant promise for the production of green hydrogen, playing a crucial role in decarbonization across various industrial sectors. The operational effectiveness of this technology hinges on its electrical efficiency. This is intrinsically tie
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Improving the anode subsystem water management of a PEM fuel cell system
A simulation study towards enhanced power density and lifetime
The increasing awareness and urgency of climate change have led to an increase in investments and research into power sources not reliant on fossil fuels. Proton exchange membrane (PEM) fuel cells are a promising technology for automotive, maritime, and auxiliary power applicatio
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Fuel cell Systems Applied in Expedition Cruise ships
A Comparative Impact Analysis
Global endeavors to reduce emissions in the shipping industry are accelerating the interest in fuel cell systems. This paper explores the application of different fuel cell types (LT-PEMFC, HT-PEMFC and SOFC) in combination with different fuels (LH2, LNG,MeOH and NH3) in expediti
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Electrochemical Reduction of Carbon Dioxide
Modeling the electrochemical conversion of CO2 to Formic Acid under high pressure
Due to rising concerns about climate change, a lot of research is currently underway with respect to the development of new technologies which can contribute to the decline of atmospheric CO2, and will allow further penetration of renewables into the energy mix. A prom
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Multiphase Flow Modelling of Electrochemical Systems
An analytical approach
The primary objective of this work is to provide new analytical models to support the theoretical understanding of multiphase flows in various electrochemical systems. Most of the previous works in this field use either experiments or numerical simulations to understand the hydro
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Gas Crossover in Small Gap Alkaline Electrolysers
A CFD Study on Bubble Generation and Gas Crossover Effects
This thesis addresses the critical issue of gas crossover in small gap alkaline electrolysers, significantly impacting the safety of hydrogen production systems. The research aims to optimize electrolysis cell design by investigating how bubble coverage, gap size, and electrolyte
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Reducing the concentration of hydrogen and oxygen dissolved in the electrolyte helps to increase the efficiency of alkaline water electrolysis. This thesis provides an account of the evolution of dissolved concentration in the vicinity of the electrode surface for alkaline water
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In this research project, multiphase behaviour in zero gap alkaline water electrolyzers is investigated, focusing on the influence of various parameters including current density, electrode-wall distance and electrode height. This involves a cell containing a vertical electrode p
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This research aims to analyse the non-ohmic resistance of multiple ion-exchange membranes (IEM) in series, for a better understanding of membrane resistances. These membranes can be found in series in energy storage systems such as acid-base flow batteries (ABFB).
The effect ...
The effect ...
The unprecedented increase in mean ambient temperature due to immoderate CO2 emissions has shifted the energy policy towards the replacement of fossil fuels with renewable energy sources. Nevertheless, the intermittency of these technologies renders them unsuitable for reliable e
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A water electrolyzer is an electrochemical device that produces hydrogen and oxygen from water via electricity. A sustainable way of producing hydrogen with renewable electricity, also known as green hydrogen, could enable its use in decarbonisation of sectors that depend on foss
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In an effort to make water electrolysis more efficient and simple, flow-through electrolyzers eliminate the need for a gas-separating membrane between the electrodes. However, replacing the membrane with a forced flow field brings new challenges and considerations. In this resear
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This study focuses on water electrolysis and aims to provide suggestions for the company XINTC Global, for the design of the electrolyser and the accompanying flow network. The most important parameters for this project are the dimensions of the cell, the geometry of the piping n
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