Inst. Energietechnik

143 Items

Recent Submissions
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...

Optimal design of supercritical carbon dioxide cycle based system for concentrated solar power application

Ma, Yuegeng (2020)

Concentrated solar power (CSP) is a promising alternative to conventional fossil fuel energy for the future electricity generation. Upgrading the power block with a supercritical carbon dioxide (S-CO2) cycle is regarded as a promising approach to achieving better efficiency and lower levelized cost of electricity (LCOE) for the CSP plant. This work performs an optimal design of the S-CO2 cycl...

Simulation-based study and analysis of the wind power integration using heat pump and thermal energy storage

Heidar Esfehani, Hamidreza (2020)

Despite the fast-growing rate of the implementation of renewable energy technologies, high fluctuations of wind feed-in supply are currently seen as the main challenge facing further feeding of wind power to electricity grids and consequently increasing the renewable share of the energy market. Considering the fact that the utility network has no capability of storing excess power production, t...

Advanced Exergy Analysis in the Dynamic Framework for Assessing Building Thermal Systems

Picallo-Perez, Ana ; Sala, José M ; Tsatsaronis, George ; Sayadi, Saeed (2019-12-25)

This work applies the Dynamic Advanced Exergy Analysis (DAEA) to a heating and domestic hot water (DHW) facility supplied by a Stirling engine and a condensing boiler. For the first time, an advanced exergy analysis using dynamic conditions is applied to a building energy system. DAEA provides insights on the components’ exergy destruction (ED) by distinguishing the inefficiencies that can be p...

Exergetic and Economic Evaluation of a Transcritical Heat-Driven Compression Refrigeration System with CO2 as the Working Fluid under Hot Climatic Conditions

Luo, Jing ; Morosuk, Tatiana ; Tsatsaronis, George ; Tashtoush, Bourhan (2019-11-28)

The purpose of this research is to evaluate a transcritical heat-driven compression refrigeration machine with CO2 as the working fluid from thermodynamic and economic viewpoints. Particular attention was paid to air-conditioning applications under hot climatic conditions. The system was simulated by Aspen HYSYS® (AspenTech, Bedford, MA, USA) and optimized by automation based on a genetic algor...

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...

Development of the 3D multi-view particle tracking velocimetry with multi-pass robust initialization tracking algorithm

Askan, Tunc (2019)

In this study a new flow visualization method the 3D Multi-View Particle Tracking Velocimetry has been developed. This multi-view vision based measurement system can capture large-scale flow structures with optical obstacles. In order to increase the tracking performance of this method, it is enhanced with a novel tracking algorithm, the multi-pass tracking algorithm with robust initialization....

Evaluation of a gas refinery using exergy-based methods

Sarcheshmehpoor, Mehrnoosh (2019)

Processing of natural gas as one of the main resources of energy has been always in the center of focus to boost production of high commercial value products such as ethane, propane, butane and condensate for different applications. In this work, some operation units of a natural gas refinery are assessed based on thermodynamic efficiency and economic feasibility and from environmental impacts ...

Short-term electricity trading for system balancing: An empirical analysis of the role of intraday trading in balancing Germany's electricity system

Koch, Christopher ; Hirth, Lion (2019-07-25)

Previous studies have noted that, unexpectedly, Germany's dramatic expansion of wind and solar energy coincided with a reduction of short-term balancing reserves. This observation has been dubbed the “German Balancing Paradox”. This paper provides further and updated evidence: since 2011, wind and solar energy have nearly doubled while both reserve requirements and reserve use have declined by ...

Cryogenic energy storage systems

Hamdy, Sarah (2019)

Grid-scale energy storage systems are capable of providing the needed flexibility to the power grid operators in order to ensure a secure power supply with increasing shares of highly intermittent electricity generation from renewable energy sources. Cryogenic energy storage (CES) is a grid-scale energy storage concept in which electricity is stored in the form of liquefied gas enabling a remar...

Analytische und numerische Untersuchung der Geschwindigkeitsprofile an perforierten Doppelböden in Reinräumen mit Verdrängungsströmung

Zielke, Benjamin (2019)

In Reinräumen mit Turbulenzarmer Verdrängungsströmung stellt sich am perforierten Doppelboden eine Geschwindigkeitsverteilung ein. In der vorliegenden Arbeit wird der Einfluss der Doppelboden-Geometrie und des Widerstandsbeiwerts der Perforation auf das sich einstellende Geschwindigkeitsprofil am Boden untersucht. Hierfür wird eine Parameterstudie mittels numerischer Strömungssimulationen (comp...

Power-to-Heat-Anlagen in der Fernwärmeversorgung

Mollenhauer, Eike (2019)

Der Ausbau der erneuerbaren Elektrizitätserzeugung führt zu steigenden Flexibilitätsanforderungen an Erzeuger und Verbraucher und somit auch an die Fernwärmesysteme. Die bestehende Sektorenkopplung durch die Heizkraftwerke kann durch Power-to-Heat-Anlagen weiter ausgebaut und flexibilisiert werden. Die vorliegende Arbeit untersucht die Installation vonWärmepumpen und elektrischen Heizkesseln (...

A Comparative Exergoeconomic Evaluation of the Synthesis Routes for Methanol Production from Natural Gas

Blumberg, Timo ; Morosuk, Tatiana ; Tsatsaronis, George (2017-11-24)

Methanol is one of the most important feedstocks for the chemical, petrochemical, and energy industries. Abundant and widely distributed resources as well as a relative low price level make natural gas the predominant feedstock for methanol production. Indirect synthesis routes via reforming of methane suppress production from bio resources and other renewable alternatives. However, the convent...

Erweiterung einer Berechnungsmethode für die Regelung von Absorptionskälteanlagen

Albers, Jan (2019)

Zielstellung für eine erweiterte Methode der charakteristischen Gleichungen ist es, die bisher bekannte Berechnungsmethodik soweit zu verfeinern, dass sie auch für die reale Steuerung und Regelung von einstufigen H2O/LiBr-Absorptionskälteanlagen genutzt werden kann. Dies erfordert eine genauere Beschreibung des Leistungsverhaltens unter verschiedenen praxisrelevanten Randbedingungen (wie z.B. v...

Simulation and Exergy Analysis of Energy Conversion Processes Using a Free and Open-Source Framework—Python-Based Object-Oriented Programming for Gas- and Steam Turbine Cycles

Zoder, Marius ; Balke, Janosch ; Hofmann, Mathias ; Tsatsaronis, George (2018-09-30)

State-of-the-art thermodynamic simulation of energy conversion processes requires proprietary software. This article is an attempt to refute this statement. Based on object-oriented programming a simulation and exergy analysis of a combined cycle gas turbine is carried out in a free and open-source framework. Relevant basics of a thermodynamic analysis with exergy-based methods and necessary fl...

Wavelength-selective neutron imaging for materials science

Al-Falahat, Ala'a (2019)

Neutron imaging, specifically radiography and tomography, is nowadays widely used technique for non-destructive investigations of materials and is commonly utilized for various applications in the field of engineering science and technology. The neutron imaging experiments presented in this work were conducted at the neutron imaging facility CONRAD-2 and at the ESS test beamline instrument V20 ...

A Review of Evaluation, Optimization and Synthesis of Energy Systems: Methodology and Application to Thermal Power Plants

Wang, Ligang ; Yang, Zhiping ; Sharma, Shivom ; Mian, Alberto ; Lin, Tzu-En ; Tsatsaronis, George ; Maréchal, François ; Yang, Yongping (2018-12-27)

To reach optimal/better conceptual designs of energy systems, key design variables should be optimized/adapted with system layouts, which may contribute significantly to system improvement. Layout improvement can be proposed by combining system analysis with engineers’ judgments; however, optimal flowsheet synthesis is not trivial and can be best addressed by mathematical programming. In additi...