Hydrogen energy storage in porous media

The demand for sustainable and clean energy sources has become increasingly vital in addressing the challenges of climate change and energy security. Hydrogen, with its high energy density and potential for carbon-free energy conversion, has emerged as a promising candidate for future energy systems. Efficient storage and retrieval of hydrogen...

Energy and Water system integration in the urban environment

The transition from a fossil to a renewable energy system presents challenges in ensuring reliable and affordable energy supply. This dissertation addresses these challenges by proposing an integrated system approach to designing a renewable energy and water system on the neighborhood level. The concept, known as Power-to-H3, involves converting...

Integration of Energy Storage in Solar-powered EV Smart Charging Systems

This thesis investigates the integration of electric vehicle (EV) charging, photovoltaic (PV) power, and battery energy storage (BES), using a direct current (DC) integrated multi-port power converter. The goal is to aid the energy transition using the intelligent operation of the aforementioned components to provide a more cost-effective system...

DC trolleygrids as sustainable, multi-functional, and multi-stakeholder electrical infrastructures: Thinking outside of the bus

Electricity grids are increasingly congested as the world moves toward a sustainable, electrified future. Expanding and upgrading these infrastructures is costly and challenging on a technical and administrative level and even redundant when considering that some sub-parts of these grids, such as electric transportation networks, are massively...

Sorption enhanced CO₂ methanation for large scale energy storage: Catalyst and Process development

<b>Chapter 1</b> is the introduction, which presents thestate of the art in synthesis and application of these, in fact, bi-functionalmaterials for sorption enhanced CO₂ methanation.</p><p class="MsoNormal" style="text-indent:12.5pt">    In <b>Chapter 2</b>, zeolite 13X and 5A supported...

Aggregators’ business models for flexibility from electricity consumers

In order to limit the amount of greenhouse gas emission, transitioning to renewable energy sources (RES) is critical. However, integrating RES in the existing power system is not straightforward since RES possess variable and uncertain characteristics. Due to these characteristics, as the penetration of RES increases, maintaining the balance...

Rational Design of Afterglow and Storage Phosphors

In this thesis, we have studied two types of charge carrier capturing and detrapping processes: (a) electron capturing and electron liberation; (b) hole<br/>capturing and hole liberation. Both the (a) and (b) processes can be utilized for the rational design of afterglow and storage phosphors in different compounds.

Investment planning for flexibility sources and transmission lines in the presence of renewable generation

Environmental and political factors determine long-term development for renewable generation around the world. The rapid growth of renewable generation requires timely changes in power systems operation planning, investments in additional flexible assets and transmission capacity. The development trends of restructured power systems suggest that...

Methods for simulation, planning, and operation of Aquifer Thermal Energy Storage under deep uncertainty

The building sector currently accounts for approximately one-third of the global demand for energy, and one-fifth of all energy-related greenhouse gas emissions (GHG). The development and adoption of energy-efficient technologies in this sector is therefore a key element towards efforts for the mitigation of climate change. In particular,...

The hidden side of cities: Methods for governance, planning and design for optimal use of subsurface space with ATES

Aquifer Thermal Energy Storage (ATES) systems provide sustainable space heating and cooling for buildings. In future, many buildings in moderate climates rely on ATES for their space heating and cooling. <br/>However, the subsurface space available for heat storage is limited and, there is a trade-off between individual ATES system efficiency...

Kinetic and thermodynamic aspects of Mg and Mg-Ti hydride nanomaterials

Reliable and affordable energy storage represents a bottleneck in a scenario where renewable energy sources become prominent on the energy market. With its high potential energy density and the natural abundance of the element, hydrogen gas is an attractive energy storage medium. But its gaseous nature, its high explosive potential and...

Advanced Thin Layer Deposition of Materials for Li-ion Batteries via Electrospray

The remarkable physicist Richard P. Feynman once said, more than fifty years ago: ”the principles of physics, as far as I can see, do not speak against the possibility of maneuvering things atom by atom. It is not an attempt to violate any laws; it is something, in principle, that can be done; but in practice, it has not been done because we are...

Power system operation with large-scale wind power in liberalised environments

Our society revolves around electricity. Most electricity is produced from fossil fuels, such as coal and natural gas. The disadvantages are that their supply is finite and unevenly distributed across the earth. Conventional power stations also emit greenhouse gases. Therefore, sustainable alternativees must be developed, such as wind power. The...

Modelling and optimization of a permanent-magnet machine in a flywheel

This thesis describes the derivation of an analytical model for the design and optimization of a permanent-magnet machine for use in an energy storage flywheel. A prototype of this flywheel is to be used as the peak-power unit in a hybrid electric city bus. The thesis starts by showing the feasibility of using a flywheel energy storage system...