Inst. Energietechnik

195 Items

Recent Submissions
Digitalisierung in der Energiewirtschaft

Corusa, Andreas ; Erdmann, Georg ; Timofeeva, Elena ; Predel, Johannes Norbert ; Ritschel, Falk ; Sprengel, Christian ; Walther, Anne ; Kaufmann, Daniel ; Brühl, Stefan ; Stocker, Victor ; Rosinger, Christine ; Uslar, Mathias ; Schäfer-Stradowski, Simon (2021-05)

Wir unternehmen mit diesem Werk den Versuch einen Teil der Komplexität des Themas anhand des Knowhows der beitragenden Autoren aus verschiedenen Disziplinen zu vereinen, um nicht nur Neugier des Lesenden zu wecken, sondern auch und um über das Thema Digitalisierung aufzuklären. Dabei besteht das Kompendium aus vier Teilen, die verschieden Herausforderungen der Digitalisierung beleuchten und sys...

Coal-exit health and environmental damage reductions outweigh economic impacts

Rauner, Sebastian ; Bauer, Nico ; Dirnaichner, Alois ; Dingenen, Rita Van ; Mutel, Chris ; Luderer, Gunnar (2020-03-23)

Cheap and abundant coal fuelled the industrialization of Europe, North America and Asia1. However, the price tag on coal has never reflected the external cost to society; coal combustion produces more than a third of today’s global CO2 emissions and is a major contributor to local adverse effects on the environment and public health, such as biodiversity loss and respiratory diseases. Here, we ...

Exergy-based investigation and optimization of a heat-driven polygeneration system using carbon dioxide as working fluid

Luo, Jing (2021)

To achieve global sustainable development goals, efficiency improvement of sustainable energy systems is the most cost-effective and near-term option. Polygeneration systems improve system efficiency significantly and minimize the discharge of system pollutants. In this work, a novel small-scale waste heat-driven polygeneration system using CO2 as its working fluid was proposed for local power ...

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...

Holistic energy system modeling combining multi-objective optimization and life cycle assessment

Rauner, Sebastian ; Budzinski, Maik (2017-12-05)

Making the global energy system more sustainable has emerged as a major societal concern and policy objective. This transition comes with various challenges and opportunities for a sustainable evolution affecting most of the UN's Sustainable Development Goals. We therefore propose broadening the current metrics for sustainability in the energy system modeling field by using industrial ecology t...

Air quality co-benefits of ratcheting up the NDCs

Rauner, Sebastian ; Hilaire, Jérôme ; Klein, David ; Strefler, Jessica ; Luderer, Gunnar (2020-04-18)

The current nationally determined contributions, pledged by the countries under the Paris Agreement, are far from limiting climate change to below 2 ∘C temperature increase by the end of the century. The necessary ratcheting up of climate policy is projected to come with a wide array of additional benefits, in particular a reduction of today’s 4.5 million annual premature deaths due to poor air...

Environmental impact assessment in energy-economy-climate models

Rauner, Sebastian (2021)

Climate change is one of, if not the, most important issues faced by the global society in the 21st century. The effects of climate change are visible on all continents and oceans already today and a business-as-usual will lead to severe consequences on the earth system, the economy and public health. Keeping these risks in check, the international community signed the Paris Agreement, stating ...

Absorption heat transformer - state-of-the-art of industrial applications

Cudok, Falk ; Giannetti, Niccolò ; Ciganda, José L. Corrales ; Aoyama, Jun ; Babu, P. ; Coronas, Alberto ; Fujii, Tatsuo ; Inoue, Naoyuki ; Saito, Kiyoshi ; Yamaguchi, Seiichi ; Ziegler, Felix (2021-02-23)

The use of waste heat or low-exergy heat sources represents a strategic opportunity to reduce the environmental footprint and operation cost of industrial processes. The absorption heat transformer, also known as absorption heat pump type II, is a thermal machine which can boost the temperature of a heat flow by using a negligible amount of electrical power. However, owing to the lack of estab...

Covid-19 contagion via aerosol particles – comparative evaluation of indoor environments with respect to situational R-value

Kriegel, Martin ; Hartmann, Anne (2021-02)

Basierend auf einem Modell zur Bewertung des Infektionsrisikos mit SARS-CoV-2 über virenbeladene Aerosolpartikel werden verschiedene Innenräume miteinander verglichen. Die Anzahl der jeweils in der Situation durch eine bereits infizierte Person neuinfizierten Personen wird dabei gegenübergestellt. Der situationsbedingte R-Wert in Kulturstätten (z.B. Theater, Kinos) ist dabei geringer als in z.B...

Covid-19 Ansteckung über Aerosolpartikel – vergleichende Bewertung von Innenräumen hinsichtlich des situationsbedingten R-Wertes

Kriegel, Martin ; Hartmann, Anne (2021-02)

Basierend auf einem Modell zur Bewertung des Infektionsrisikos mit SARS-CoV-2 über virenbeladene Aerosolpartikel werden verschiedene Innenräume miteinander verglichen. Die Anzahl der jeweils in der Situation durch eine bereits infizierte Person neuinfizierten Personen wird dabei gegenübergestellt. Der situationsbedingte R-Wert in Kulturstätten (z.B. Theater, Kinos) ist dabei geringer als in z.B...

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 ...

Investigation of off‐design characteristics of an improved recompression supercritical carbon dioxide cycle for concentrated solar power application

Ma, Yuegeng ; Morosuk, Tatiana ; Liu, Ming ; Liu, Jiping (2020-09-02)

The off‐design characteristics of an improved recompression supercritical carbon dioxide cycle integrated with a two‐stage intercooled main compressor are investigated with a focus on the concentrated solar power application. An off‐design model is established for each crucial component of the cycle system of 100‐megawatt scale. Four cycle control schemes with different main compressor configur...

Purpose in Thermodynamics

Bejan, Adrian ; Tsatsaronis, George (2021-01-13)

This is a review of the concepts of purpose, direction, and objective in the discipline of thermodynamics, which is a pillar of physics, natural sciences, life science, and engineering science. Reviewed is the relentless evolution of this discipline toward accounting for evolutionary design with direction, and for establishing the concept of purpose in methodologies of modeling, analysis, teach...

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...

Exergy-Based Analysis and Optimization of an Integrated Solar Combined-Cycle Power Plant

Elmorsy, Louay ; Morosuk, Tatiana ; Tsatsaronis, George (2020-06-13)

The transition towards higher shares of electricity generation from renewable energy sources is shown to be significantly slower in developing countries with low-cost fossil fuel resources. Integrating conventional power plants with concentrated solar power may facilitate the transition towards a more sustainable power production. In this paper, a novel natural gas-fired integrated solar combin...

Mini-Grids for the Sustainable Electrification of Rural Areas in Sub-Saharan Africa: Assessing the Potential of KeyMaker Models

Cabanero, Andrea ; Nolting, Lars ; Praktiknjo, Aaron (2020-12-01)

Solar hybrid mini-grid systems possess the potential to substantially support electrification in sub-Saharan Africa. While their technical reliability has been proven, their financial viability is achieved only by heavy subsidization as of now. Due to the growing importance of results-based financing, we ask whether newly developed business models leveraging on the value added of electricity su...

Managing Power Demand from Air Conditioning Benefits Solar PV in India Scenarios for 2040

Ershad, Ahmad Murtaza ; Pietzcker, Robert ; Ueckerdt, Falko ; Luderer, Gunnar (2020-05-02)

An Indian electricity system with very high shares of solar photovoltaics seems to be a plausible future given the ever-falling solar photovoltaic (PV) costs, recent Indian auction prices, and governmental support schemes. However, the variability of solar PV electricity, i.e., the seasonal, daily, and other weather-induced variations, could create an economic barrier. In this paper, we analyze...

A Fully Open Source Remote Laboratory for Practical Learning

Letowski, Bastien ; Lavayssière, Camille ; Larroque, Benoît ; Schröder, Martin ; Luthon, Franck (2020-11-03)

Nowadays, communication and web services are part of our lives, including education, and e-learning applications are used more and more. However, teaching in engineering sciences requires an important amount of practical experiments. Hence, remote laboratories are an attractive solution, offering new tools for both teachers and learners. Our objective is to propose a fully open source remote la...