Sortierung Titel Year

Publikationen


Peer Reviewed Scientific Journals | 2016

Methodological approaches for fractionation and speciation to estimate trace element bioavailability in engineered anaerobic digestion ecosystems: An overview

van Hullebusch ED, Guibaud G, Simon S, Lenz M, Yekta SS, Fermoso FG, Jain R, Duester L, Roussel J, Guillon E, Skyllberg U, Almeida CMR, Pechaud Y, Garuti M, Frunzo L, Esposito G, Carliell-Marquet C, Ortner M, Collins G. Methodological approaches for fractionation and speciation to estimate trace element bioavailability in engineered anaerobic digestion ecosystems: An overview. Critical Reviews in Environmental Science and Technology. 17 August 2016;46(16): 1324-1366.

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Contributions at other events | 2013

Metodologie per il campionamento di particolato prodotto da apparecchi per la combustione di biomassa solida

Andrea, Pizzi. Metodologie per il campionamento di particolato prodotto da apparecchi per la combustione di biomassa solida, Ph.D. Thesis, Marche Polytechnic University, Ancona, Italy, 2013.

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La combustione di biomassa legnosa con piccoli apparecchi e caldaie è oggi vista con rinnovato interesse per il raggiungimento degli obiettivi comunitari di produzione di energia rinnovabile al 2020. L’aumento dell’utilizzo della biomassa combustibile è di stretto interesse del settore agroforestale, per via del notevole indotto economico che peraltro interessa tutto il territorio nazionale. Tuttavia, la combustione della biomassa è legata ad una serie di problematiche ambientali quali le emissioni in atmosfera di polveri sottili che influenzano direttamente la qualità dell’aria. Si ritiene, quindi, che l’auspicato aumento dell’utilizzo delle biomasse, soprattutto ai fini della produzione di calore (riscaldamento ambienti), sia legata al contenimento delle emissioni al camino. In questo contesto, è quindi importante la corretta misura delle polveri emesse dagli apparecchi di riscaldamento domestico alimentati a biomassa solida, tenendo conto anche della frazione condensabile, come richiesto dalla normativa. Il lavoro mette a confronto due tecniche di misura delle polveri, la tecnica di prelievo a caldo con raffreddamento dei fumi in impinger e la tecnica di diluizione con tunnel. Sono stati selezionati per il confronto due apparecchi di ridotta potenza (< 15 kWt) ed elevata efficienza: una caldaia a pellet ed una stufa a pellet. In condizioni di combustione completa le due tecniche restituiscono fattori di emissione simili. Nella stufa a pellet la misura a freddo è maggiore del 20 – 30 % rispetto alla misura a caldo. La ridotta presenza della frazione condensabile è stata confermata dall’analisi NPOC degli impinger. Sono state misurate le emissioni totali prodotte da un utilizzo reale del dispositivo, comprendendo anche le fasi transitorie di combustione (accensione, riscaldamento a regime e spegnimento), solitamente non considerate nelle misure standard di laboratorio. La fase di accensione produce fino a tre volte le polveri emesse in condizioni stazionarie. L’emissione totale si riduce all’aumentare del tempo di utilizzo del dispositivo, rientrando nell’intervallo delle emissioni delle condizioni stazionarie dopo circa 6 h. Gli IPA, emessi in quantità elevate, sono costituiti maggiormente da congeneri a peso molecolare medio – basso, associati a minore tossicità. Il TEQ è funzione della potenza e delle condizioni di
combustione del dispositivo.


Conference contributions | 2013

Micro and small scale pellets CHPs. Technology survey.

Haslinger W, Aigenbauer S, Höftberger E. Micro and small scale pellets CHPs. Technology survey, European Pellets Conference 2013, 27th-28th of February 2013, Wels, Austria.

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Conference contributions | 2009

Micro-CHP – Experiences with thermoelectric generators integrated in a wood pellet combustion unit

Friedl G, Moser W, McCarry A, Berndt K, Schöpke R. Micro-CHP – Experiences with thermoelectric generators integrated in a wood pellet combustion unit, 28th International_and 7th European_Conference_on_Thermoelectrics 2009, 26th-30th of July, 2009, Freiburg, Germany

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Wood pellet combustion units are a comfortable, full automatic and low emission solution for the provision of space heating in small scale applications. The requirement of an auxiliary energy source for the heat supply and distribution however results in a dependence on the electrical grid. The goal of this work is thereby to eliminate this dependence and to meet the auxiliary energy demand through the independent production of electrical energy. The thermoelectric power production method was chosen from a number of technology variations so as to guarantee the silent and maintenance free production of direct current that can be implemented in cellars and space heaters. The first development step was the implementation of a Prototype with a fuel heat input of 10 kW and a nominal electrical power of 200 W. The central point of the implementation was the integration of a thermo-generator in a pellet combustion unit and the subsequent evaluation of the system concept. The integrated system implemented in the prototype confirms the feasibility of the combination of these technologies. The electrical efficiency of the thermo-generator was found to be in accordance with the target value of 4%, corresponding to a produced nominal electric power of 200 W.


Other Presentations | 2014

Microalgae as source of biogas: Anaerobic digestion of un- and pre-treated biomass

Gruber M, Zohar E, Jerney J, Nussbaumer M, Ludwig I, Hieger C, Bromberger P, Bochmann G, Obbard JP, Schagerl M, Fuchs W, Drosg B. Microalgae as source of biogas: Anaerobic digestion of un- and pre-treated biomass, Algae Networking Event 2014, 11th of September 2014, Dürnrohr, Austria. (oral presentation)

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Other Presentations | 2013

Microbial conversion of H2S for sulphuric acid recycling

Rachbauer L, Gabauer W, Ortner M, Bochmann G. Microbial conversion of H2S for sulphuric acid recycling, 9th International Conference on Renewable Resources & Biorefineries 2013, 5th-7th of June 2013, Antwerpen, Belgium. (peer reviewed) (visual presentation)

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Conference contributions | 2020

Microgrid Lab 100 % - R&D project for decentralized energy supply with biomass and other Distributed energy Resources

Aigenbauer S. Microgrid Lab 100 % - R&D project for decentralized energy supply with biomass and other Distributed energy Resources. 6th Central European Biomass Conference, 22-24 January 2020, Graz.

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Conference contributions | 2020

Microgrid Lab 100% Testbed for the development of control algorithms for microgrids

Aigenbauer S, Microgrid Lab 100% Testbed for the development of control algorithms for microgrids. 6th Central European Biomass Conference, 22-24 January 2020, Graz.

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Conference contributions | 2017

Microgrids and the Regional Balance of Supply and Demand in the Electricity and Heating Sector

Stadler M, Mair C, Zellinger M, Lichtenegger K, Haslinger W, Temper M, Moser A, Carlon E, Muschick D, Gölles M. Microgrids and the Regional Balance of Supply and Demand in the Electricity and Heating Sector. 20. Österreichischer Biomassetag, Windischgarsten, 14. - 15. November 2017.

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Other publication | 2017

Microgrids und dezentrale Energieerzeugung

Stadler M.,Carlon E., Gölles M., Haslinger W., Lichtenegger K., Mair C., Moser A., Muschick D., Zellinger M. Microgrids und dezentrale Energieerzeugung. Wasser Cluster Lunz/See Österreich, 21. September 2017.

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Other publication | 2017

Mikro-Netze und die regionale Balance von Erzeugung und Verbrauch im Strom- und Wärmebereich

Stadler M, Mair C, Zellinger M, Lichtenegger K, Haslinger W, Temper M, Moser A, Carlon E, Muschick D, Gölles M. Mikro-Netze und die regionale Balance von Erzeugung und Verbrauch im Strom- und Wärmebereich. Impulsreferat 20. Österreichischer Biomassetag. Sektorkopplung & Flexibilisierung. Windischgarsten, Österreich. 14. November 2017.

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Conference contributions | 2015

Mikrobielle Kontamination als Ursache für Fehlgerüche bei der Lagerung von Holzpellets

Pöllinger-Zierler P, Sedlmayer I, Reinisch C, Siegmund B, Wopienka E, Pointner C, Haslinger W. Mikrobielle Kontamination als Ursache für Fehlgerüche bei der Lagerung von Holzpellets, European Pellet Conference 2015, 25th-26th of Feburary 2015, Wels, Austria.

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Conference contributions | 2016

Mixed alcohol synthesis based on wood gas derived from dual fluidized bed biomass steam gasification - applying a rapeseed oil methyl ester gas scrubber for gas conditioning

Binder, M., Rauch, R., Hofbauer, H., 2016, "Mixed alcohol synthesis based on wood gas derived from dual fluidized bed biomass steam gasification - applying a rapeseed oil methyl ester gas scrubber for gas conditioning", poster presentation at BioResTec2016 - 1st International Conference on Bioresource Technology for Bioenergy, Bioproducts & Environmental Sustainability , 23 - 26 October 2016, Sitges, Spain.

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Conference contributions | 2015

Model based control of a biomass fired steam boiler

Zemann C, Unterberger V, Gölles M. Model based control of a biomass fired steam boiler. 19. Steirisches Seminar über Regelungstechnik und Prozessautomatisierung. September 2015, Wagna, Austria.

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Contributions to trade journals | 2014

Model based control of the secondary air massflow of biomass furnaces [Modellbasierte Regelung des Sekundärluftmassenstromes bei Biomasse-Feuerungsanlagen]

Schörghuber C, Gölles M, Dourdoumas N, Obernberger I. Model based control of the secondary air massflow of biomass furnaces. At-Automatisierungstechnik. 2014;62(7):487-99.

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To influence the combustion process of modern biomass furnaces specifically the combustion-controller determines the necessary mass flows. The gaseous mass flows can be adjusted by fans and flaps. To ensure the desired overall performance of the furnace the mass flows need to be set by inner control loops respectively. Within the work described in this paper a model based approach for the control design of the inner control loop is presented exemplarily for the secondary air supply. Thereby a flatness-based feedforward control will be designed by means of an appropriate model. © 2014 Oldenbourg Wissenschaftsverlag GmbH.


Conference contributions | 2014

Model based optimization of a combined biomass-solar thermal system

Stift F, Hartl M, Ferhatbegović T, Aigenbauer S, Simetzberger A. Model based optimization of a combined biomass-solar thermal system. Energy Procedia. 2014;48:681-688. (peer reviewed)

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Peer Reviewed Scientific Journals | 2020

Model-based control of hydraulic heat distribution systems — Theory and application

Unterberger V, Muschick D, Loidl A, Poms U, Gölles M, Horn M. Model-based control of hydraulic heat distribution systems — Theory and application. Control Engineering Practice. 2020;2020(101).104464. https://doi.org/10.1016/j.conengprac.2020.104464

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With the share of renewable energy sources increasing in heating and hot water applications, the role of hydraulic heat distribution systems is becoming more and more important. This is due to the fact that in order to compensate for the often fluctuating behaviour of the renewables a flexible heat transfer must be ensured by these distribution systems while also taking the optimal operating conditions (mass flow, temperature) of the individual components into consideration. This demanding task can be accomplished by independently controlling the two physical quantities mass flow and temperature. However, since there exists an intrinsic nonlinear coupling between these quantities this challenge cannot be handled sufficiently by decoupled linear PI controllers which are currently state-of-the-art in the heating sector. For this reason this paper presents a model-based control strategy which allows a decoupled control of mass flow and temperature. The strategy is based on a systematic design approach from models described in this contribution, which are validated by commercially available components from which most of them can be parametrized by the data sheet. The control strategy is designed for a typical hydraulic configuration used in heating systems, which will allow the accurate tracking of the desired trajectories for mass flows, temperatures and consequently heat flows. The controllers are validated experimentally and compared to well-tuned state-of-the-art (PI) controllers in order to illustrate their superiority and prove their decoupling of the control of mass flow and temperature in real world applications.


Other Presentations | 2017

Model-based control of hydronic networks using graph theory

Muschick D, Unterberger V, Gölles M. Model-based control of hydronic networks using graph theory. Steirische Seminar über Regelungstechnik und Prozessautomatisierung / Styrian Workshop on Automatic Control. September 2017.

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Reviewed Conference Papers | 2017

Model-Based Control Strategies for an Efficient Integration of Solar Thermal Plants Into District Heating Grids

Unterberger V, Muschick D, Gölles M. Model-Based Control Strategies for an Efficient Integration of Solar Thermal Plants Into District Heating Grids. ISES Solar World Congress 2017. 29.10-02.11.2017. Abu Dhabi, United Arab Emirates.

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The integration of solar thermal plants into district heating grids requires advanced control strategies in order to utilize the full potential in terms of efficiency and least operating effort. State-of-the-art control strategies cannot completely fulfil this since they are not able to consider the physical characteristics of the different components, nor do they take information on future conditions and requirements into account properly. A promising attempt for improvement is the application of model-based control strategies together with practicable forecasting methods for both the solar yield as well as the heat demand. This contribution will present the results of several projects performed on the development of suitable mathematical models, forecasting methods and control strategies relevant for the integration of solar thermal plants into district heating grids.


Conference contributions | 2020

Model-based estimation of the flue gas mass flow in biomass furnaces

Niederwieser H. Model-based estimation of the flue gas mass flow in biomass furnaces. 6th Central European Biomass Conference. 22-24 January 2020, Graz.

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Technical Reports | 2018

Modellbasierte Regelung und Elektrofilterintegration zur schadstoffarmen Verbrennung alternativer Biomassebrennstoffe

Muschick D, Zemann C, Kelz J, Hofmeister G, Gölles M. Modellbasierte Regelung und Elektrofilterintegration zur schadstoffarmen Verbrennung alternativer Biomassebrennstoffe. FFG, Energieforschungsprogramm 1. Ausschreibung. 2018.

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Technical Reports | 2018

Modellbasierte Regelung von Scheitholzkesseln mit Pufferspeicher - Smart logwood boiler

Endbericht (Entwurf)

Deutsch M, Gölles M, Zemann C, Zlabinger S. Modellbasierte Regelung von Scheitholzkesseln mit Pufferspeicher - Smart logwood boiler. FFG, Energieforschungsprogramm 1. Ausschreibung. 2018.

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Scheitholzkessel sind die in Europa immer noch am stärksten verbreitete Form von Holz-basierten Zentralheizungssystemen. Der Bestand ist überaltert und weist die größten Anteile an den verursachten Schadstoffemissionen aus Festbrennstoffzentralheizungssystemen auf. Das Ziel des Projektes, die komplette Neuentwicklung einer modellbasierten Regelung für Scheitholzkessel mit Pufferspeichern und einer Solaranlage, stellte einen Technologie-sprung in Richtung einer drastischen Reduktion der Schadstoffemissionen (CO, org. C, Fein-staub) bei gleichzeitiger Erhöhung des Nutzungsgrades und Benutzerkomforts dar. Dabei erfolgte sowohl die übergeordnete Regelung des Zusammenspiels der Komponenten (Systemregelung) als auch die Regelung der einzelnen Komponenten (Feuerungsregelung, Hydraulikregelung) modellbasiert. Die neue Regelung basiert auf einer gezielten Interaktion mit dem Benutzer, in welcher der Benutzer zielgerichtet zum Nachlegen einer bestimmten Brennstoffmenge in einem bestimmten Zeitraum aufgefordert wird. Zusätzlich dazu werden alle Teilprozesse (Verbrennung des Scheitholzes, Übertragung der Wärme in den Pufferspeicher, usw.) modellbasiert und damit deutlich effizienter und genauer geregelt. Im Fall der Feuerungsregelung wurde zusätzlich zur modellbasierten Regelung von Vorlauf-temperatur und Sauerstoffgehalt auch eine innovative CO-l-Regelung eingesetzt, die basierend auf einer kontinuierlichen Schätzung der CO- l-Charakteristik unter Verwendung eines kombinierten Sensors zur Sauerstoffmessung und Detektion unverbrannter Kompo-nenten stets einen für den aktuellen Betriebszustand optimalen Sollwert für den Sauer-stoffgehalt vorgibt. Die laufende Anpassung des Sauerstoffgehaltes führt zu einer deutlichen Reduktion der Schadstoffemissionen (CO, org. C, Feinstaub). Zum Erreichen dieser Ziele wurden im Wesentlichen folgende Schritte durchgeführt:

  • Experimentelle Untersuchung und Modellierung des Abbrandverhaltens von Scheitholz (inklusive der CO-l-Charakteristik)
  • Entwicklung einer übergeordneten modellbasierten Systemregelung
  • Entwicklung einer modellbasierten Feuerungsregelung (inkl. CO-l-Regelung) für einen effizienten und schadstoffarmen Betrieb des Scheitholkessels
  • Experimentelle Bewertung des Potentials der modellbasierten Regelung
  • Analyse der Anforderungen zur Anpassung der Regelung an andere Konfigurationen

 

Das beantragte Projekt leistete somit einen entscheidenden Beitrag zum Ausschreibungs-schwerpunkt „Effiziente und emissionsarme Klein- und Kleinstfeuerungen durch Integration einer intelligenten Verbrennungs- und Leistungsregelung“ und ging zusätzlich explizit auf die im Ausschreibungsleitfaden adressierte Verwendung von kombinierten Sensorsystemen wie CO- l-Sensorsysteme zur Verbrennungsregelung ein. Dabei ist insbesondere hervorzuheben, dass der durchdachte Ansatz das Sensorsignal zu Schätzung der CO- l-Charakteristik zu verwenden den wesentlichen Vorteil mit sich bringt, dass die exakte Messung der CO-Emissionen durch den Sensor nicht erforderlich ist, sondern es ausreicht, wenn dieser die Tendenzen richtig wiedergibt.


Contributions at other events | 2015

Modellbildung und Regelung von Biomasse-Feuerungsanlagen

Schörghuber, C. Modellbildung und Regelung von Biomasse-Feuerungsanlagen, Ph.D. Thesis, Technische Universität Graz, Graz, Austria, 2015.

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Conference contributions | 2013

Modellbildung von Luft- und Rauchgasrezirkulations-Zufuhren bei Biomasse-Feuerungsanlagen

Schörghuber C, Gölles M, Dourdoumas N, Brunner T, Obernberger I. Modellbildung von Luft- und Rauchgasrezirkulations-Zufuhren bei Biomasse-Feuerungsanlagen, 18. Steirisches Seminar über Regelungstechnik und Prozessautomatisierung 2013, 2nd-5th of September 2013, Leibnitz, Austria.

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Contributions to trade journals | 2008

Modellierung des dynamischen Verhaltens der Wärmeübertragung in einem Rauchrohr-Wärmeübertrager

Bauer R, Gölles M, Brunner T, Dourdumas N, Obernberger I. Dynamic modelling of the heat transfer in a gas tube heat exchanger. At-Automatisierungstechnik. 2008;56(10):513-20.

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