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Rixrath, Doris
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Official Name
Rixrath, Doris
Main Affiliation
Akademische Titel
DI(FH) DI
Email
doris.rixrath@forschung-burgenland.at
Scopus Author ID
56083304600
Status
staff
Research Outputs
Now showing 1 - 10 of 17
- PublicationRaCiA - Rankine Cycle für industrielle Abwärmen(Klima- und Energiefonds, 2016-01-16)
; ; Die Nutzung von Abwärme, insbesondere durch Verstromung, gewinnt zunehmend an Bedeutung für die Steigerung der Energie-Effizienz und die Reduktion von Treibhausgasen. Das Projekt „RaCiA – Rankine Cycle für industrielle Abwärmen“ soll die Industrie dabei unterstützen, Prozess-Abwärme vermehrt zu nutzen. Es gibt eine Reihe von Konzepten und Anlagen zur Abwärme- Verstromung, die nach dem Prinzip der Wärmekraftmaschine funktionieren, wie etwa Dampfkraft- oder ORC- Prozesse. Dennoch ist die breite Umsetzung der Abwärme- Nutzung durch Verstromung in der Industrie noch nicht in Schwung gekommen. Das Sondierungsprojekt RaCiA zielt darauf ab, die Energieeffizienz durch die Verstromung von Low-Exergy-Quellen zu steigern. Entwickelt wurde ein neuartiger Dampfprozess zur Verstromung von Abwärme mit dem niedrigen Temperaturniveau zwischen 140 °C und 550°C. Das patentierte Verfahren verwendet das Prozessmedium Wasser und basiert auf einer mehrstufigen Flash-Verdampfung. Das Prozessdesign ermöglicht das Einbinden von Niedertemperatur- Abwärmen mit unterschiedlichen Temperaturniveaus. Auf Basis von thermodynamischen Prozesssimulationen und einer ökologischen Bewertung wurde der neuartige Prozess optimiert und mit State-of-the-Art Prozessen verglichen. Das Ergebnis zeigt deutliche Vorteile des neuartigen Prozesses gegenüber Vergleichsprozessen (z.B. dem ORC- Prozess) sowohl in Effizienz als auch in ökologischer Sicht. Zum Beispiel könnte im betrachten Fall der Nutzung der Abluft aus Klinkerkühlern in Zementwerken die durch den neuartigen Prozess erzeugte Stromproduktion im Vergleich zu einem herkömmlichen ORC- Prozess um rund 29% gesteigert werden.287 - PublicationImplementing an advanced waste separation step in an MBT plant: assessment of technical, economic and environmental impacts(Sage, 2013-06-23)
; ; ; ; Heavy fractions resulting from mechanical treatment stages of mechanical–biological waste treatment plants are posing very specific demands with regard to further treatment (large portions of inert and high-caloric components). Based on the current Austrian legal situation such a waste stream cannot be landfilled and must be thermally treated. The aim of this research was to evaluate if an inert fraction generated from this waste stream with advanced separation technologies, two sensor-based [near-infrared spectroscopy (NIR), X-ray transmission (XRT)] and two mechanical systems (wet and dry) is able to be disposed of. The performance of the treatment options for separation was evaluated by characterizing the resulting product streams with respect to purity and yield. Complementing the technical evaluation of the processing options, an assessment of the economic and global warming effects of the change in waste stream routing was conducted. The separated inert fraction was evaluated with regard to landfilling. The remaining high-caloric product stream was evaluated with regard to thermal utilization. The results show that, in principal, the selected treatment technologies can be used to separate high-caloric from inert components. Limitations were identified with regard to the product qualities achieved, as well as to the economic expedience of the treatment options. One of the sensor-based sorting systems (X-ray) was able to produce the highest amount of disposeable heavy fraction (44.1%), while having the lowest content of organic (2.0% Cbiogenic per kg waste input) components. None of the high-caloric product streams complied with the requirements for solid recovered fuels as defined in the Austrian Ordinance on Waste Incineration. The economic evaluation illustrates the highest specific treatment costs for the XRT (€23.15 per t), followed by the NIR-based sorting system (€15.67 per t), and the lowest costs for the air separation system (€10.79 per t). Within the ecological evaluation it can be shown that the results depend strongly on the higher heating value of the high caloric light fraction and on the content of Cbiogenic of the heavy fraction. Therefore, the XRT system had the best results for the overall GWP [−14 kg carbon dioxide equivalents (CO2eq) per t of input waste] and the NIR-based the worst (193 kg CO2 eq per t of input waste). It is concluded that three of the treatment options would be suitable under the specific conditions considered here. Of these, sensor-based sorting is preferable owing to its flexibility.Scopus© Citations 2 177 - PublicationENEREED - Sustainable Energy Conversion from Reed(Klima- und Energiefonds, 2013-12-19)
; ; ; ; ; 255 147 - PublicationComparison of different building shells - life cycle assessmentThe REACT (Renewable Energy & Efficiency Action) project is an EU-funded cross-border cooperative venture featuring the participation of companies and researchers from Burgenland (Austria) and western Slovakia that is developing zero energy concepts for newly built single-family homes. A variety of building structures are defined for family houses, and the different impacts they have on the environment are evaluated over the entire life cycle. This paper aims to compare the environmental impacts of different building shells during both the construction and the demolition phases. However, the operation phase of the building is not evaluated. One of the findings of the project thus far is that the demolition and disposal of building materials should be included in any such evaluation. For some environmental impact assessment categories, both demolition and disposal are important. The environmental impacts of various end-of-life scenarios can differ greatly based on the disposal method (e.g., landfill, incineration, recycling, etc.) chosen and on the proportion of recycled content. Furthermore, the results show that manufacturing building materials from renewable resources can have strong environmental impacts, particularly when substantial amounts of fossil fuel are required in their production.
172Scopus© Citations 1 - PublicationReed as a Biomass Resource in the Danube Region – An Assessment of Potentials and Different Utilization Possibilities for Energy Production in Austria(Institute for Regional Studies Centre for Economic and Regional Studies Hungarian Academy of Sciences, 2015)
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501 284 - PublicationEvaluating the Market Competitiveness of Reed Based Biofuels(Institute for Regional Studies Centre for Economic and Regional Studies Hungarian Academy of Sciences, 2015)
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