FG Energieverfahrenstechnik und Umwandlungstechniken regenerativer Energien

13 Items

Recent Submissions
Optimal sizing of Solar Home Systems: Charge controller technology and its influence on system design

Schmid, Fabian ; Behrendt, Frank (2021-04-09)

Solar Home Systems are a promising solution to enable access to affordable, reliable, sustainable, and modern energy for non-electrified areas, especially in the Global South. In this study, the influence of the charge controller technologies Maximum Point Tracker (MPPT) and Pulse Width Modulation (PWM) on the optimal system design and system performance is analyzed. Therefore, a multi-objectiv...

Hybrid life cycle assessment and modelling approaches

Heihsel, Michael (2021)

A steadily growing part of the world population is confronted with water shortages and drought. Population growth, economic development and climate change are the drivers of this development. Australia has been severely affected by this trend since the beginning of the millennium, which is why the country is looking for paths to become less dependent on precipitation. Seawater desalination is ...

Untersuchung der Gefährdung von Personen und Bauwerken in Folge des Versagens von LNG-Kraftstoffspeichern für Fahrzeuge in Tunneln

Eberwein, Robert (2021)

Liquefied Natural Gas (LNG) aus regenerativen Quellen, stellt einen potenziellen Kraftstoff für den Schwer- und Fernverkehr des Straßenverkehrs dar. Gegenüber seinen positiven Eigenschaften zu dem in diesem Verkehrssektor häufig verwendeten Kraftstoff Diesel birgt der Kraftstoff aber auch Gefahren für Personen und Bauwerke durch seine sehr niedrige Temperatur bei der Speicherung von ca. -160 °C...

Investigations on hydrodesulfurization reactions using slurry catalysts and supercritical water

Risse, Stephan (2021)

Depletion of easily accessed and light crude oil sources is shifting future crude oil supply to less attractive heavier oil fractions. Vacuum residue, as the heaviest fraction found in crude oil and the bottom product of the vacuum distillation column in a refinery, has therefore been gaining more and more attention in the past years. It is mostly used as heavy fuel oil in the shipping sector o...

An open-source modeling tool for multi-objective optimization of renewable nano/micro-off-grid power supply system: Influence of temporal resolution, simulation period, and location

Schmid, Fabian ; Winzer, Joscha ; Pasemann, André ; Behrendt, Frank (2020-12-13)

A fundamental understanding of the sizing process is a key element for sizing affordable, reliable, and sustainable nano/micro-off-grid systems. Nevertheless, the openness and transparency of modeling approaches are still low and open-source tools are scarce in this field. In this study, an open-source modeling tool for the optimization of renewable nano/micro-off-grid power supply systems is d...

Desalination and sustainability: a triple bottom line study of Australia

Heihsel, Michael ; Lenzen, Manfred ; Behrendt, Frank (2020-11-18)

For many arid countries, desalination is considered as the final possible option to ensure water availability. Although seawater desalination offers the utilisation of almost infinite water resources, the technology is associated with high costs, high energy consumption and thus high carbon emissions when using electricity from fossil sources. In our study, we compare different electricity mixe...

Electrification of waste collection vehicles: Techno-economic analysis based on an energy demand simulation using real-life operational data

Schmid, Fabian ; Taube, Linda ; Rieck, Jenny ; Behrendt, Frank (2020-10-14)

Waste transport plays an important role in the decarbonization of the transport sector. In this paper diesel-powered (dWCV) and electric waste collections vehicles (eWCV) and their operation are analysed regarding energy demand and total cost of ownership (TCO) integrating Well-to-Wheel emission costs. Further, an open-source simulation tool with a route synthetization approach is presented usi...

The carbon footprint of desalination: An input-output analysis of seawater reverse osmosis desalination in Australia for 2005–2015

Heihsel, Michael ; Lenzen, Manfred ; Malik, Arunima ; Geschke, Arne (2018-12-31)

This study examines greenhouse gas emissions for 2005–2015 from seawater desalination in Australia, using conventional energies. We developed a tailor-made multi-regional input-output-model. We complemented macroeconomic top-down data with plant-specific desalination data of the largest 20 desalination plants in Australia. The analysed capacity cumulates to 95% of Australia's overall seawater d...

Consequences of long-term infrastructure decisions—the case of self-healing roads and their CO2 emissions

Rodríguez-Alloza, Ana María ; Heihsel, Michael ; Fry, Jacob ; Gallego, Juan ; Geschke, Arne ; Wood, Richard ; Lenzen, Manfred (2019-11-14)

What could be the reduction in greenhouse gas emissions if the conventional way of maintaining roads is changed? Emissions of greenhouse gases must be reduced if global warming is to be avoided, and urgent political and technological decisions should be taken. However, there is a lock-in in built infrastructures that is limiting the rate at which emissions can be reduced. Self-healing asphalt i...

Continuous on-line tar monitoring in hot process gases from biomass gasification by means of fluorescence spectroscopy

Borgmeyer, Julian (2020)

Tar and tar related problems remain the foremost obstacle in development and especially in the implementation of gasification technologies into today’s energy supply systems. Tar-forming polycyclic aromatic compounds (PAC) are by-products of most high temperature thermochemical conversion processes of biomass. Further advances in technology development depend on reliable analytical methods to a...

Molybdenum sulfide as efficient hydrogen evolving catalyst for light-induced water splitting

Xi, Fanxing (2019)

In the presented work, molybdenum sulfide is investigated as a catalyst for hydrogen evolution reaction (HER) and CO2 reduction reaction (CO2RR). This thesis mainly consists of three parts: (i) a study of the catalytic performances and catalytic mechanism of semiconducting (NH4)2Mo3S13 cluster as an electro-catalyst and as a co-catalyst for WSe2 photocathode, (ii) a study of the phase transform...

Renewable-powered desalination as an optimisation pathway for renewable energy systems: the case of Australia's Murray–Darling Basin

Heihsel, Michael ; Ali, Syed Muhammad Hassan ; Kirchherr, Julian ; Lenzen, Manfred (2019-12-11)

The ecology in the Murray–Darling Basin in Australia is threatened by water scarcity due to climate change and the over-extraction and over-use of natural water resources. Ensuring environmental flows and sustainable water resources management is urgently needed. Seawater desalination offers high potential to deliver water in virtually unlimited quantity. However, this technology is energy-inte...

Towards biochar and hydrochar engineering

Dieguez-Alonso, Alba ; Funke, Axel ; Anca-Couce, Andrés ; Rombolà, Alessandro Girolamo ; Ojeda, Gerardo ; Bachmann, Jörg ; Behrendt, Frank (2018-02-27)

The impact of conversion process parameters in pyrolysis (maximum temperature, inert gas flow rate) and hydrothermal carbonization (maximum temperature, residence time and post-washing) on biochar and hydrochar properties is investigated. Pine wood (PW) and corn digestate (CD), with low and high inorganic species content respectively, are used as feedstock. CD biochars show lower H/C ratios, th...