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Sebastian Eyerer

Sebastian Eyerer
Bosch · Division of Thermotechnology

Doctor of Engineering

About

44
Publications
16,599
Reads
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466
Citations
Additional affiliations
May 2020 - June 2020
Bosch Thermotechnology
Position
  • Engineer
May 2015 - April 2020
Institute for Energy Systems
Position
  • Research Assistant
Description
  • Design and Construction of a pilot ORC plant
May 2015 - April 2020
Institute for Energy Systems
Position
  • Research Assistant
Description
  • Lecture and Tutorial: Electricity and Heat Storages
Education
October 2009 - December 2014
Technische Universität München
Field of study
  • Mechanical Engineering

Publications

Publications (44)
Article
A new generation of refrigerants, the hydrofluoroolefines, has been introduced within the last years. These fluids have a significantly smaller Global Warming Potential compared to the state-of-the-art fluids, which are within the class of hydrofluorocarbons. The hydrofluoroolefines are unsaturated molecules consisting of double-bonded carbon atoms...
Article
This study investigates the potential of hydrothermal geothermal energy for combined heat and power (CHP) generation in Germany. Based on the theoretical potential of hydrothermal heat in place, the technical and economic potential is determined with a review and an analysis of existing geothermal plants. To this end, the thermodynamic and economic...
Article
Several approaches to enhance the performance of Organic Rankine Cycles (ORC) have been investigated in literature, including architecture, working fluid selection and part-load optimization together with combined heat and power (CHP) generation. To contribute to these developments, the design and the first operation of an advanced ORC-CHP architec...
Article
Achieving the 2050 EU climate targets - an economy with net-zero greenhouse gas emissions - requires a significant increase in the share of renewables in the current energy mix. The Organic Rankine Cycle (ORC) could play an important role in this transformation of today’s energy systems. The ORC is able to convert low-temperature heat sources into...
Article
The Organic Rankine Cycle (ORC) can be applied to generate power from low-temperature heat sources and thus supports a sustainable energy system. This paper contributes to ORC development, particularly for geothermal applications, to increase competitiveness of the technology. To this end, new plant architectures based on regenerative preheating ar...
Thesis
Full-text available
The Organic Rankine Cycle (ORC) can be applied to generate power from low-temperature heat sources and thus supports a sustainable energy system. In order to make this technology more competitive, this thesis contributes to their development, particularly for geothermal applications. To this end, environmentally friendly working fluids and new plan...
Article
Organic Rankine Cycles (ORC) are a promising technology to generate power from low temperature heat sources and can therefore help transform current energy systems into renewable ones. However, ORCs are often affected by a wide range of operating conditions with a high share of part load operation. Therefore, detailed component models are necessary...
Article
The present experimental and numerical investigation is about an efficiency increasing and/or cost-reducing measure for Organic Rankine Cycle (ORC) systems. In such systems, a high proportion of the self-consumption of the system lies in the condensation of the working fluid due to the operation of ventilators or cooling pumps. Typically, the conde...
Article
Petrothermal reservoirs contain a tremendous technical potential without major regional restrictions. The application of supercritical CO2 (sCO2) as a heat carrier might be a promising alternative to the commonly discussed usage of water. This study evaluates both heat carriers for a CHP application. A novel CHP plant layout for a thermosiphon with...
Article
Organic Rankine Cycle systems are increasingly installed in low-enthalpy geothermal plants to supply efficiently heat and power. The variation in heat demand and the possible contribution to grid ancillary services result in part-load operation and flexibility challenges for the ORC. A suitable control system, able to maximize the power output and...
Conference Paper
Full-text available
Enhanced Geothermal Systems (EGS) contain a tremendous technical potential without major regional restrictions. Over the last years, several studies proposed the application of supercritical CO2 (sCO2) as a heat carrier for the utilization of geothermal resources as a promising alternative to the usage of water. The existing studies focus only on s...
Conference Paper
Full-text available
Organic Rankine Cycle Systems (ORC) are able to convert efficiently low-temperature geothermal heat sources into mechanical and electrical power or combined heat and power. Especially when producing both heat and power, high operational flexibility is necessary to meet the heat demand and supply electricity in an efficient way. Advanced controllers...
Conference Paper
Full-text available
Over the last years, the optimization of the Organic Rankine Cycle technology has been enforced. There are several approaches to increase the efficiency of ORC plants, including the ORC plant design, the working fluid selection, the part-load optimization together with combined heat and power (CHP) generation, as well as the optimization of the pla...
Conference Paper
Full-text available
Organic Rankine Cycles are a promising technology to generate power from low temperature heat sources and can therefore help to transform current energy systems into renewable ones. However, ORCs are often affected by a broad range of operating conditions; therefore detailed component models are required for the design process. This work validates...
Conference Paper
Full-text available
The present experimental and numerical investigation is about an efficiency increasing and/or cost-reducing measure for Organic Rankine Cycle (ORC) systems. In such systems, a high proportion of the self-consumption of the system lies in the condensation of the working fluid due to the operation of ventilators or cooling pumps. Typically, the conde...
Conference Paper
Full-text available
As geothermal energy is gaining in importance within the global energy system, there are numerous studies concerning the assessment of geothermal potential, although the methodologies used can vary considerably in some cases. Thus, a common framework for the assessment of geothermal resources is crucial for providing comprehensive information to in...
Article
The Organic Rankine Cycle (ORC) is a thermal engine, which is used to convert low temperature heat to electrical power using organic working fluids. It is an established technique for waste heat recovery and for the utilization of renewable heat. This study presents a novel operational strategy of an ORC, which allows for reliable control of proces...
Article
Full-text available
The Organic Rankine Cycle (ORC) is a promising technology to convert low temperature heat to electrical power. It utilizes organic substances, which are often refrigerants, as working fluids. With the groups of hydrofluoroolefines (HFO) and hydrochlorofluoroolefines (HCFO), a new generation of refrigerants has been introduced within the last years....
Presentation
Full-text available
A new generation of ORC working fluids has been introduced within the last years. These fluids have a significantly lower Global Worming Potential, compared to the currently applied fluids, i.e. R245fa or R134a. Especially, due to legislative acts such as the EU F-Gas regulation or the Kigali Amendment, the application of these working fluids is hi...
Conference Paper
Full-text available
The hydrofluoroolefines (HFO) have been introduced within the last years as new generation of refrigerants having a significantly lower Global Warming Potential. Compared to the state-of-the-art fluids within the class of hydrofluorocarbons (HFC), the HFO molecules are unsaturated, consisting of double bonded carbon atoms. The difference in the che...
Conference Paper
Full-text available
The Organic Rankine Cycle (ORC) is a thermal engine, which is applied to convert low temperature heat to electrical power using organic working fluids. It is an established technique for waste heat recovery, as well as for the utilization of biomass, geothermal energy and solar energy. This study presents a novel operational strategy of an ORC, whi...
Article
Der Energiemarkt in Deutschland steht spätestens seit dem Einleiten der Energiewende vor großen Veränderungen. Die Bundesregierung strebt einen deutlichen Anstieg erneuerbarer Energieerzeugung an. Im Gegensatz zu der volatilen Stromerzeugung von Photovoltaik und Windkraft, steht mit der Geothermie eine potenziell verlässliche und regelbare Energieq...
Conference Paper
Full-text available
Zusammenfassung In den letzten Jahren erfolgte eine kontinuierliche Zunahme von erfolgreich installierten Kraftwerken in der hydrothermalen Geothermie mit unterschiedlichen Kraftwerkskonzepten und Thermalwassertemperaturen in verschiedenen Regionen Deutschlands. Die realen Betriebsdaten dieser Anlagen ermöglichen nun eine Neubewertung des Potential...
Article
Full-text available
In this study, the material compatibility of refrigerants focusing on hydrofluoroolefines (HFO) with typical polymers in ORC plants and refrigeration units is analyzed with consistent testing conditions and a complete uncertainty analysis of the results. One state-of-the-art refrigerant, namely R245fa, as well as the low-GWP fluids R1233zd-E and R1...
Conference Paper
Full-text available
The aim to reduce CO2 emissions leads to a growing importance of renewable sources and a strong focus on efficient heat and power production. Therefore, the energy system is faced with versatile challenges concerning the security of supply, economic benefit for the operators as well as the environmental impact. In order to deal with these challenge...
Article
Full-text available
Der Energiemarkt in Deutschland steht spätestens seit dem Einleiten der Energiewende vor großen Veränderungen. Die Bundesregierung strebt einen deutlichen Anstieg erneuerbarer Energieerzeugung an. Im Gegensatz zu der volatilen Stromerzeugung von PV und Windkraft, steht mit der Geothermie eine potentiell verlässliche und regelbare Energiequelle zur...
Technical Report
Full-text available
Die interdisziplinäre Forschung der Munich School of Engineering (MSE) als sogenanntes Integrative Research Center konzentriert sich auf Energie und Nachhaltigkeit mit den Schwerpunkten Erneuerbare Energien, Elektromobilität, Energieerzeugung, Energiespeicherung, Kraftwerks- technologien sowie Energieeffizienz im Bauwesen. Der Interdisziplinarität...
Article
Combined heat and power is highly favorable in order to prevent harmful CO2-emissions. Besides that, economic benefits go along due to higher full load operation hours. The present work investigates the flexibility and suitability of different Organic Rankine Cycles for combined heat and power concepts, since it can play a significant role to achie...
Presentation
Full-text available
Experimenteller Vergleich von R1233zd-E als Ersatz für R245fa
Patent
Full-text available
The present invention concerns an energy conversion method and system based on a Clausius-Rankine cycle and in particular on an organic Rankine cycle. The method comprises steps of providing a processing medium (2) carrying heat and/or under high pressure and temperature with increased energy content, expanding the processing medium (2) in order to...
Conference Paper
Full-text available
This study analyzes an experimental investigation of an Organic Rankine Cycle (ORC) with R1233zd-E as working fluid in terms of measuring uncertainty. A methodology for an uncertainty analyses containing systematic errors and the propagation of random errors has been presented and exemplarily applied for the measuring uncertainty of the gross therm...
Article
The Organic Rankine Cycle can be applied to convert low temperature heat to electrical power using organic working fluids. Recently, a new generation of working fluids has been introduced with almost no Ozone Depletion Potential and significantly smaller Global Warming Potential, compared to currently used refrigerants. R1233zd-E is a promising low...
Conference Paper
Full-text available
In membrane desalination, the phenomenon of concentration polarization is the fundamental base of a variety of other effects influencing membrane performance, which is extensively discussed in literature, e.g. scaling and fouling. The experimental research on directly measuring concentration polarization is mainly based on micro-electrodes or optic...
Thesis
In this work, a two-wavelengths Schlieren method has been applied to investigate boundary layer phenomena in membrane desalination with focus on reverse osmosis. The concentration boundary layer, which forms adjacent to the membrane, significantly effect the process efficiency. This leads to the aim to analyze this boundary layer phenomenon in orde...
Conference Paper
Full-text available
Forschendes Lernen mit Ernstcharakter - elektrische Ladungstrennung bei der Gerinnung von Blut.
Conference Paper
Full-text available
Elektrische Ladungstrennung bei wandernden Phasenfronten in Polymeren.

Questions

Questions (2)
Question
I'm searching for papers dealing with experimental comparison of forth generation refrigerants such as R1233zde, R1234ze or R1336mzz-Z with state-of-the-art fluids like R245fa and R134a as a working fluids for ORC. I've found lots of simulative studies but only few experimental analyses. 
Question
A pump is driven by an asynchronous motor which in turn is connected to the grid via an inverter. When the rated power of the motor for 50Hz is known, can I apply a linear relationship between power and frequency to calculated the actual power for various frequencies?

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Projects

Projects (3)
Project
The aim of the research project “GeoFlex” is to analyze the flexibility potential of thermal power plants used for deep geothermal projects – both from a technical as well as an economic point of view. To do so, investigations will be conducted to identify if and how deep geothermal plants are suitable to compensate the residual power demand in an adjustable way and to supply the controlling power range. In addition, costs will be determined which are associated with the use of the flexibility potential of deep geothermal systems. The determined cost structures will be compared with alternative and already existing flexibility options.
Project
The Geothermal Alliance Bavaria is a scientific consortium adopting a holistic approach for application-oriented fundamental research in the field of geothermal heat and power production. The power plant is crucial for electricity revenue, thus, an improved plant operation with high efficiency and availability, can improve the profitability significantly. An unplanned shutdown of the plant generally causes high losses through lack of current revenues. Within the project "Monitoring" therefore a software-based monitoring tool for existing and future geothermal power plants is developed to optimize the plant operation. Therefore, the objective is to evaluate the operation of geothermal power plants developing an software-based online application for operational monitoring. In the long term it should be made possible to detect changes in plant operation early in order to take appropriate countermeasures. By comparing current operation data with previous operating conditions aging-related changes can be identified in order to possibly take maintenance measures. Sharing the data with other operators on a uniform database allows the comparison of the plants and focused evaluation with the aim to increase efficiency, availability and thus also economic performance of the power plant.
Project
The Geothermal Alliance Bavaria is a scientific consortium adopting a holistic approach for application-oriented fundamental research in the field of geothermal heat and power production. Especially in terms of primary energy consumption and CO2 emissions the combined production of heat and power (CHP) is advantageous compared to the separate generation. Also from an economic perspective, CHP is an interesting option. It leads to a better utilization of a heat source and thus contributes to increase to full load hours of a plant. Furthermore, it gives the operator of the plant a second product and thus more degrees of freedom when it comes to economic performance. Especially for ORC plants, which have a quiet low thermal efficiency compared to the conventional Rankine Cycle, due to the limited Carnot efficiency using the low-temperature heat sources, a good utilization of the source is crucial for the profitability of the project. Therefore, the project scope calls for research into the optimization of geothermal CHP and ORC technology. At the Institute for Energy Systems a new ORC-CHP test rig is under construction where the experimental proof of several measures for efficiency enhancement is addressed. Besides the plant architecture itself, the working fluid has significant influence on plant operation and efficiency which strongly depends on the boundary conditions such as heat source temperature or heat demand of district heating. Thus, the new test rig is compatible to various working fluids to be able to experimentally identify optimal working fluids for different boundary conditions especially focusing on new-generation low-GWP working fluids. Furthermore, the plant operation is optimized by investigating control strategies in practice. The focus is on efficiency enhancement in part load operation and on optimization of the dynamic behavior. Directly linked to this, the increase in flexibility of geothermal power plants can possibly lead to the provision of balancing power. In future electricity market scenarios, this provision of balancing power is highly desired and can be a new source of revenue for geothermal projects. Therefore, the possibilities and technical requirements are examined and tested at the test rig. The geothermal power plants which are currently in operation have a high auxiliary power demand, i.e. the condensation of the working fluid. Therefore, the reduction of parasitic power consumption is also focused by theoretical and experimental investigation. Further Information: https://www.mse.tum.de/en/geothermal-alliance-bavaria/