Hermann Edtmayer

• Doctor of Engineering
• Research Associate at Graz University of Technology

Smart, supervisory controllers for integrated energy systems can benefit from added flexibility in the energy system, provided either directly by storage or indirectly by demand response measures. Both types of flexibility allow reducing peak loads and increase self-consumption, e.g., of electricity from PV or heat from solar collectors. In the cas...

In this demonstration paper, we present our interactive virtual reality (VR) experience, which has been designed to facilitate interaction with energy-related information. This experience consists of two main modes: the world in miniature for large-scale and first-person for real-world scale visualizations. Additionally, we presented our approach t...

Virtual Reality Digital Twin

In this conference contribution we would like to present our work on the development of a virtual reality digital twin for energy research. Buildings and city districts are increasingly being developed in an integrated way, involving many disciplines simultaneously. As a result, the diversity of research elements and results as well as their interr...

Knowledge about the demand of renewable thermal energy is essential for the integrated planning of sustainable cities. Planners and decision-makers need high-quality and comprehensive data for rapid and decisive action. However, little to no corresponding information is available for the status quo or possible development scenarios. Thus, new metho...

Increasing demands on indoor comfort in buildings and urgently needed energy efficiency measures require optimised HVAC systems in buildings. To achieve this, more extensive and accurate input data are required. This is difficult or impossible to accomplish with physical sensors. Virtual sensors, in turn, can provide these data; however, current vi...

In contemporary urban planning an efficient use of resources is key. Therefore, information about the thermal energy demand of the area to be worked on is very important. Ideally, comprehensive data on both aspects, the status quo and future scenarios is at the disposal of the stakeholders involved. However, there is often little information on the...

In smart and integrative urban planning, the energy supply as well as environmentally relevant or microclimatic consequences are taken into account in the development of space and uses. In order to cope with this complex task, new digital tools for energy analysis must be developed. This is the subject of the ECR Smart City Graz 2020 project presen...

In der Europäischen Union, werden 51 % des Endenergiebedarfes für die Wärme- und Kälteversorgung verwendet (Fleiter, et al., 2017). Gleichzeitig wird zukünftig eine signifikante Zunahme des Kältebedarfes erwartet. Folglich ist zur Erreichung der Pariser Klimaziele eine vollständige Dekarbonisierung der Wärme- und Kälteversorgung erforderlich, die j...

This poster presents the development and application of an urban building energy simulation model to analyse an existing 5th generation district heating and cooling network (5GDHC) in Zürich, Switzerland with regard to possible sector coupling potentials. We evaluated, how the heat energy production through large industrial heat pumps and the total...

This conference presentation shows the thermal energy analysis of a city district in Graz, Austria by the use of a newly developed numerical energy system model. From this model, a multi-tool workflow was derived to implement a high-resolution bottom-up approach at district scale. The goal was to carry out a sensitivity analysis regarding different...

This conference article presents the thermal energy analysis of a city district in Graz, Austria by the use of a newly developed numerical energy system model (see figure 1). From this model, a multi-tool workflow was derived to implement a high-resolution bottom-up approach at district scale. The goal was to carry out a sensitivity analysis regard...

In this paper the development and application of an urban building energy simulation model is presented to analyse an existing 5th generation district heating and cooling network (5GDHC) with regard to possible sector coupling potentials. It was evaluated, how the heat energy production through large industrial heat pumps and the total thermal capa...

„Graz strebt bei Erhöhung der Lebensqualität die höchstmögliche Senkung des CO2-Ausstoßes an und wird hierdurch klimaneutral. Trotz wachsender Bevölkerung soll bis 2050 nur mehr ein Fünftel des Ressourcen¬verbrauchs anfallen. Dazu bedarf es einer Vorreiterrolle im Bereich der integrierten Raum-, Stadt-, Verkehrs- und Energieplanung.“ Im Sinne diese...

Our energy systems are developing rapidly, as our cities do. Also, climate protection must be vigorously promoted. In order to shape the necessary energy supply of tomorrow in our cities and regions, all players in spatial energy planning must take a holistic view of energy systems across all sectors and tackle the technical and organisational chal...

This paper presents a comprehensive analysis of the thermal behaviour and the flow characteristics of a monastery cell with integrated component heating system (CHS). For the evaluation of the system the heating characteristics and the resulting thermal behaviour was investigated. The intention was to develop a model for similar thermal refurbishme...

In this presentation the topic of sector coupling is discussed with a specific focus on utilising extra profits for the operation of an existing 5th generation district heating and cooling network (5GDHC) in Zürich, Switzerland. It was investigated, how the heat energy production through large industrial heat pumps and the total heat capacities of...

Our energy systems are developing rapidly, as are our cities. Climate protection must also be vigorously promoted. In order to shape the necessary energy supply of tomorrow in our cities and regions, all stakeholders must work together within the framework of "spatial energy planning" to tackle the technical and organisational challenges. The resea...

Our energy systems are developing rapidly, as are our cities. Climate protection must also be vigorously promoted. In order to shape the necessary energy supply of tomorrow in our cities and regions, all stakeholders must work together within the framework of "spatial energy planning" to tackle the technical and organisational challenges. The resea...

Kalte Fernwärme und Anergienetze

District heating plays a central role in the Austrian energy supply scheme and already covers 25% of the national heat demand. On a European level district heating was identified as one of the key technologies to transition towards a decarbonized, efficient, sustainable and fossil-free energy system. The historic development of district heating sys...

Concept development and deterministic/stochastic evaluation of cold district heating 51% of the EU's final energy demand is used for heating and cooling. In order to achieve the Paris climate targets, a complete decarbonisation of the heating and cooling supply is therefore necessary, which is to be initiated by means of innovative concepts. Heati...

Energiespeicher werden als zentraler Faktor für die Umsetzung der internationalen Klimaziele und der dafür notwendigen, vollständigen Versorgung mit erneuerbaren, volatilen Energiequellen angesehen [1][2]. Innovative Lösungen zur Speicherung von elektrischer Energie benötigen in den nächsten Jahren sowohl intensive Forschung & Entwicklung als auch...

Energiespeicher werden als zentraler Faktor für die Umsetzung der internationalen Klimaziele und der dafür notwendigen, vollständigen Versorgung mit erneuerbaren, volatilen Energiequellen angesehen. Innovative Lösungen zur Speicherung von elektrischer Energie benötigen in den nächsten Jahren sowohl intensive Forschung & Entwicklung als auch Praxise...

The project ClimaNET is based on the current knowledge about possible future local climate change, with a regional focus on Styria (Gobiet et al., 2012). A consortium of scientific partners and companies in the building, energy supply and energy service sector addresses two main goals in climate change adaption in the sector of " building and livin...

This paper investigates the effects of the changing climate signal on the cooling needs and indoor climate conditions during hot weather periods of selected building types in Austria. Regarding the climate signal we used observed data for the period 1981-2006 and the results of three downscaled climate scenarios, for the period 2050 (2036-2065). Th...

This publication demonstrates that flywheel energy storage systems (FESS) are a valid alternative to batteries for storing energy generated by decentralized rooftop photovoltaic systems. The increasing number of private PV arrays calls out for high energy storage capacities in order not to overload the grid. Despite being the current storage techno...

The project ClimaNET is based on the current knowledge about possible future local climate change, with a regional focus on Styria. A consortium of scien-tific partners and companies in the building, energy supply and energy service sector ad-dresses two main goals in climate change adaption in the sector of “building and living”. (A) the future re...

This PhD thesis comprises of the theoretical and practical research work, which has been carried out in the course of the research project Eta+, with the aim of waste energy reduction and recovery in technical systems. The goal of these investigations was, to optimise two experimental vehicles, a bicycle and an engine powered handheld working tool,...

Im Rahmen dieser Publikation wird gezeigt, dass Schwungrad-Energiespeicher (oder „flywheel energy storage systems“, kurz FESS) eine Alternative zu chemischen Batterien für die Energiespeicherung von Solarstrom darstellen. Infolge der signifikanten Zunahme von PV-Anlagen (Photovoltaik Anlagen) bei privaten Haushalten steigt der Bedarf an dezentraler...

Driven through the aspirations to achieve the climate targets, a clear trend towards increasing the share of renewable energy in the electricity mix can be seen. Significant gains thereby can be recorded particularly in the areas of wind power and photovoltaics. The high share of volatile power generation causes great challenges for the future elec...

This paper introduces a research project on a spark ignition engine used in non-road applications. The aim is to illustrate the present situation as basis for comparison and to identify possible improvement potential in terms of performance, efficiency or exhaust and noise emissions. The study is carried out in two steps. First a standard walk-behi...

In this publication, an intake design study was implemented in the development of a GDI engine concept at the Institute for Internal Combustion Engines and Thermodynamics at Graz University of Technology. For a high performance three-cylinder gasoline engine, different intake port geometries were developed, designed and evaluated with CAD and 3D CF...

This thesis was realized as part of the development of a new engine concept at the Institute for Internal Combustion Engines and Thermodynamics at the Graz University of Technology, research area design. The aim was to develop a high performance three-cylinder gasoline engine intake port geometry using 3D- CFD simulation methods. Beside the conside...