FG Energietechnik und Umweltschutz

13 Items

Recent Submissions
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 (...

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...

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...

Exergy-Based and Economic Evaluation of Liquefaction Processes for Cryogenics Energy Storage

Hamdy, Sarah ; Moser, Francisco ; Morosuk, Tatiana ; Tsatsaronis, George (2019-02-04)

Cryogenics-based energy storage (CES) is a thermo-electric bulk-energy storage technology, which stores electricity in the form of a liquefied gas at cryogenic temperatures. The charging process is an energy-intensive gas liquefaction process and the limiting factor to CES round trip efficiency (RTE). During discharge, the liquefied gas is pressurized, evaporated and then super-heated to drive ...

Exergetische Untersuchung einer Carbon Black Anlage

Mergenthaler, Pieter (2019)

In der vorliegenden Arbeit werden exergiebasierte Methoden angewandt, um eine Carbon Black Anlage auf Grundlage verschiedener Bewertungskriterien zu untersuchen. Dabei werden Material- und Energieströme exergetisch, exergoökonomisch und exergoökologisch bewertet. Für die Anwendung der exergoökonomischen Analyse wird die Methodik der konventionellen Kostenanalyse erweitert, sodass neben der Kost...

Evaluation and optimization of natural gas liquefaction process with exergy-based methods: a case study for C3MR

Primabudi, Eko (2019)

Propane pre-cooled mixed refrigerant process, known as C3MR, is the leading technology in the LNG market based on the capacity installed. In this study, exergy-based methods were implemented in order to obtain optimal operation conditions. The C3MR process is modeled with 4.5 MTPA production capacity using Aspen Plus process simulator, which is connected to the exergy and exergoeconomic analysi...

Thermische Speicher zur Optimierung des Betriebs von Heizkraftwerken in der Fernwärmeversorgung

Christidis, Andreas Christos (2019)

Der Energieversorgungssektor wird seit Anfang des Jahrtausends immer stärker von den gesellschaftspolitischen Zielen geprägt, den fossilen Primärenergieeinsatz und damit die anthropogenen Treibhausgasemissionen zu reduzieren. Wesentliche Maßnahmen um diese Ziele zu erreichen sind neben Einsparungen im Endenergieverbrauch, die Effizienzsteigerung der Energieumwandlung und die Erhöhung des Anteil...

Exergy-based analysis of aircraft environmental control systems and its integration into model-based design

Bender, Daniel (2019)

Aircraft environmental control systems are complex energy intensive systems and the most important non-propellant consumer of energy among all aircraft systems. The intense pressure on airlines to remain competitive on the global market demands more efficient aircraft greater than ever. Meaningful analysis methods for the evaluation of architectural designs and effective modeling and simulation...

Comparative evaluation of methanol production processes using natural gas

Blumberg, Timo Dominik (2018)

In the work, different processes for the production of methanol from natural gas are analysed from a thermodynamic and an economic point of view. Commercially available processes and promising future alternatives for increased thermodynamic efficiency, improved economics and reduced greenhouse gas emissions are assessed and compared. The analysed processes are based on the indirect synthesis ro...

Evaluation of an energy- and exergy-based generic modeling approach of combined heat and power plants

Mollenhauer, Eike ; Christidis, Andreas ; Tsatsaronis, George (2016-02-29)

Reduced models of combined heat and power plants are required for different applications. Among other usages, they are implemented as mixed integer linear programs (MILP) in energy market models or price-based unit commitment problems to study the economic feasibility and optimal operation strategies of different units. Generic models are particularly useful when limited information is availabl...

Advanced exergoeconomic analysis of a power plant with CO2 capture

Petrakopoulou, Fontina ; Tsatsaronis, George ; Morosuka, Tatiana (2015)

Conventional exergy-based analyses reveal options for improving energy conversion systems, but they suffer from some limitations that are addressed by advanced exergy-based analyses. Advanced exergy-based methods are capable of (1) identifying interdependencies among plant components (endogenous / exogenous values), and (2) revealing the potential for improvement (avoidable / unavoidable values...

Transient lattice contraction in the solid-to-plasma transition

Ferguson, K. R. ; Bucher, M. ; Gorkhover, Tais ; Boutet, S. ; Fukuzawa, H. ; Koglin, J. E. ; Kumagai, Y. ; Lutman, A. ; Marinelli, A. ; Messerschmidt, M. ; Nagaya, K. ; Turner, J. ; Ueda, K. ; Williams, G. J. ; Bucksbaum, P. H. ; Bostedt, C. (2016)

In condensed matter systems, strong optical excitations can induce phonon-driven processes that alter their mechanical properties. We report on a new phenomenon where a massive electronic excitation induces a collective change in the bond character that leads to transient lattice contraction. Single large van der Waals clusters were isochorically heated to a nanoplasma state with an intense 10-...

Against the Odds: The Potential of Swarm Electrification for Small Island Development States

Koepke, Mathias ; Groh, Sebastian (2016)

The paper builds on earlier observations using system complexity theory to explain the characteristics of a swarm electrification approach using existing small, distributed renewable energy generation infrastructure integrated into a grid. The concept is based on swarm intelligence where information and electricity flow between neighbors to achieve a compounding network effect, in that they are...