Carbon-neutral liquid fuels are doubtlessly needed for future sustainable transport. Biodiesel produced from oil crops, animal waste, and used cooking oil potentially is an alternative for mineral oils used preferably today, but the... more
Carbon-neutral liquid fuels are doubtlessly needed for future sustainable transport. Biodiesel produced from oil crops, animal waste, and used cooking oil potentially is an alternative for mineral oils used preferably today, but the quantities available are by far too small to satisfy the needs of a future market. Microalgae constitute powerful unicellular factories with enormous potential for mitigation of miscellaneous pollutants from effluent gases and waste waters. Most of all their outstanding capacity for photosynthetic CO2 fixation underlines their high potential for diminishing current ecological problems. Together with these contributions to beneficial environmental development, various microalgae accumulate high concentrations of oils and even hydrocarbons (30–80 % of cell dry mass formed) beside other high-value marketable products (e.g., polyunsaturated fatty acids or pigments like astaxanthin) as cell constituents. Low cell densities and moderate growth rates typical for algal cultivation are known as the major obstacles toward a broad market penetration of microalgal products: Here, high cell densities are required to obtain reasonable volumetric productivities. For some microalgal strains, mixotrophic cultivation by providing organic carbon substrates together with CO2 results in increased biomass concentration in a first cultivation step. For this purpose, numerous organic waste streams can be applied as substrate. In a second step, the fresh catalytically active algal biomass accumulates desired products via CO2 fixation, e.g., from industrial effluent gases, as the sole carbon source. This can be realized by two-stage, continuously operated closed photo-bioreactor systems. After cell harvest and optimized product recovery, the value-added conversion of residual algal biomass for generation of sustainable energy sources, e.g., in biogas plants, constitutes another challenge.
Research Interests:
Research Interests:
Research Interests:
Research Interests:
Bevor auf die Berechnung von Anlagen eingegangen werden kann, mussen Ubereinkommen uber einige Grosen und Bezeichnungen getroffen werden. Dies betrifft die verwendeten Ausdrucke und Begriffe sowie die verwendeten Dimensionen und die... more
Bevor auf die Berechnung von Anlagen eingegangen werden kann, mussen Ubereinkommen uber einige Grosen und Bezeichnungen getroffen werden. Dies betrifft die verwendeten Ausdrucke und Begriffe sowie die verwendeten Dimensionen und die Darstellungsweisen.
Research Interests:
Research Interests:
Research Interests:
Research Interests:
Research Interests: Business, Engineering, Environmental policy, Environmental Management, Environmental Impact Assessment, and 10 moreEnvironmental Accounting, Common Ground, Waste Disposal, Case Study, Data Collection, Energy efficient, Environmental Management System, Decision Maker, Ministry of Environment and Forests, and ministry of environment
Research Interests:
Research Interests:
Research Interests:
Male i srednje tvrtke cine znacajan dio gospodarskog sektora. Tvrtke iz proizvodnog i uslužnog sektora obicno predstavljaju znacajne potrosace energije i neminovno utjecu na emitiranje staklenickih plinova. Smanjenje emisije staklenickih... more
Male i srednje tvrtke cine znacajan dio gospodarskog sektora. Tvrtke iz proizvodnog i uslužnog sektora obicno predstavljaju znacajne potrosace energije i neminovno utjecu na emitiranje staklenickih plinova. Smanjenje emisije staklenickih plinova može se postici odgovarajucim projektiranjem i odabirom energetskih instalacija i sustava osobito onih koji koriste obnovljive izvore energije. Kvalitetna suradnja poduzetnika-investitora i znanstvenika važna je za postizanje kvalitetnih rjesenja uzimajuci u obzir potrosnju energije i ekoloske standarde. U radu je predstavljen međunarodni projekt pod nazivom "Smanjenje emisije staklenickih plinova umreženom suradnjom tvrtki i istraživaca" - REGENER. U projekt su ukljuceni austrijska, hrvatska i bugarska sveucilista i poduzeca. Projekt financira Austrijska istraživacka agencija (FFG) u okviru CIRCE programa.
Research Interests:
Rad opisuje međunarodni projekt REGENER - Smanjenje emisije staklenickih plinova suradnjom poduzetnika i znanstvenika
Research Interests:
In heat pumps with a pure refrigerant as working fluid both the condensation and the evaporation take place at constant temperature, if the pressure drop is neglected. With a nonazeotropic mixture of refrigerants as working fluid,... more
In heat pumps with a pure refrigerant as working fluid both the condensation and the evaporation take place at constant temperature, if the pressure drop is neglected. With a nonazeotropic mixture of refrigerants as working fluid, however, the temperature will decrease during the condensation and increase during the evaporation. The heating capacity may in many applications be increased considerably compared with the pure working fluids normally used today. Calculations of the 'ideal relative capacity' with eight mixtures and several pure working fluids have been carried out in six applications. From these calculations it can be concluded that from a heating capacity point of view the mixtures R12/R11, R12/R113, R12/R114, R22/R114 and R13B1/R152a are of special interest.
Research Interests:
Research Interests:
Cassava starch production is a key industrial production of Tay Ninh province, Vietnam. However, this production chain has also caused many negative impacts on the environment. This study applied the principles of circular economy to... more
Cassava starch production is a key industrial production of Tay Ninh province, Vietnam. However, this production chain has also caused many negative impacts on the environment. This study applied the principles of circular economy to analyze the waste streams via linear programming method for cassava starch circular production chain towards zero waste emission. The results show that the cassava starch indutry can achieve the goals of zero electricity, zero waste, and zero fossil energy by re-planning the production chain. The chain’s output products are 517.5 tons of bio-oil/year, 206.7 thousand tons of biochar/year, 190.0 thousand tons of dry pulp/year, 10 million m3/year of liquid fertilizer. In order to increase further the value of the chain in the circular economy, future research needs to study the feasibility of a solution to reuse wastewater to produce microalgae, as well as evaluate the effectiveness of these methods. The optimization method applied in this study can also b...
Research Interests:
Research Interests:
Research Interests: Business, Engineering, Sustainable Development, Technology transfer, Human Resource, and 10 moreCapacity Building, Virtual Environment, Partnership, Innovation Management, University Industry, Mediterranean region, Higher Education Institution, Innovation, University Industry Partnership, and University cooperation
Research Interests: Business and Engineering
ABSTRACT Der Nationale Aktionsplan 2010 für erneuerbare Energien für Österreich präsentiert die Maßnahmen, die bis 2020 eine Steigerung des Anteils erneuerbarer Energie am Bruttoenergieverbrauch auf den Zielwert von 34% (entsprechend der... more
ABSTRACT Der Nationale Aktionsplan 2010 für erneuerbare Energien für Österreich präsentiert die Maßnahmen, die bis 2020 eine Steigerung des Anteils erneuerbarer Energie am Bruttoenergieverbrauch auf den Zielwert von 34% (entsprechend der EU-Richtlinie 2009/28/EG) ermöglichen. Gegenüber einem Referenz-Szenario, das auf den bis 2009 vorliegenden Informationen zum Energieverbrauch basiert, soll für die Zielerreichung der Endenergieverbrauch bis 2020 um 13% gesenkt werden. Die einzelnen Sektoren tragen dazu in unterschiedlichem Ausmaß bei. Der größte Beitrag wird vom Sektor "Verkehr" mit einem Rückgang von 22% erwartet vor den Bereichen "Wärme und Kälte" mit –12% und "Elektrizität" mit –5%. Die Umsetzung der Richtlinie ist ein dynamischer Prozess, der durch die geplante Energiestrategie der österreichischen Bundesregierung wesentlich bestimmt wird. 2010 National Renewable Energy Action Plan for Austria The 2010 National Renewable Energy Action Plan for Austria presents measures to achieve an increase to 34 percent, by 2020, of renewables as a share of gross energy consumption (in line with EU Directive 2009/28/EC). Compared to a reference scenario based on the data on energy consumption available up to 2009, final energy consumption is to be cut by 13 percent by 2020 in order to achieve the target. Sectors will contribute different shares to this goal. The largest contribution is expected from transport (–22 percent), followed by heating and cooling (–12 percent) and electricity (–5 percent). The directive's implementation is a dynamic process, to a large extent controlled by the envisaged energy strategy of the Austrian Federal Government.
Research Interests:
Research Interests:
Research Interests:
Research Interests:
Das Kernstuck der meisten verfahrenstechnischen Prozesse stellt ein chemisches Umwandlungsverfahren dar, das die eingesetzten und vorbereiteten Rohstoffe in das gewunschte Produkt umwandelt. Auch treten chemische Reaktionen haufig in den... more
Das Kernstuck der meisten verfahrenstechnischen Prozesse stellt ein chemisches Umwandlungsverfahren dar, das die eingesetzten und vorbereiteten Rohstoffe in das gewunschte Produkt umwandelt. Auch treten chemische Reaktionen haufig in den Nebenprozessen auf, so im Rahmen der Energiebereitstellung bei der Verbrennung von Brennstoffen im Kesselhaus und bei der Entsorgung von Abfallstoffen.
Research Interests:
This paper is the second one by these authors on nonazeotropic mixtures of refrigerants at this conference. In the first paper the thermodynamical principles for the use of mixtures were presented and a number of heat pump parameters,... more
This paper is the second one by these authors on nonazeotropic mixtures of refrigerants at this conference. In the first paper the thermodynamical principles for the use of mixtures were presented and a number of heat pump parameters, which can be improved by the use of mixtures, were discussed. In this paper one of these, the COP, is discussed in more detail. Results fran a nunber of computer simulations, where the influence on the COP of various parameters are investigated, are presented. These simulations have been carried out with a conputer program developed at the Department of Chemical Engineering Furdamentals at the Technical University of Graz. The magnitude of possible improvement in the COP depends on the degree of cooling the heat source fluid. The more cooling that is required, the greater improvements are possible. Improvements up to 30% seem to be realistic. The main disadvantage with the use of refrigerant mixtures is the need for greater heat exchanger areas. This is mainly due to two reasons: lower mean temperature differences and decreased heat transfer coefficients. Usage of ternary mixtures offers new possibilities in taking influence on COP, pressure ratio, compressor discharge temperature. One example is shown on this. Finally the market potential for such heat pump system is examinated. The results indicate that in many cases heat pumps working with nonazeotropic refrigerant mixtures will be an economic solution.
Research Interests:
ABSTRACT The paper deals with the application of technology wedges in industry for the reduction of greenhouse gases. According to the needs defined by energy services in industry, four wedges are defined: cogeneration, process... more
ABSTRACT The paper deals with the application of technology wedges in industry for the reduction of greenhouse gases. According to the needs defined by energy services in industry, four wedges are defined: cogeneration, process intensification and heat integration, renewable energy and passive house standard for production halls. With these technologies, industry could cover its part in meeting international emission goals while making economical investments. Such a reduction of the dependency of industry from external energy sources is a substantial contribution to safety issues in nations and regions. KeywordsEnergy efficiency-renewable energy-industry-technology wedge-solar thermal energy
Research Interests:
Research Interests:
Research Interests:
Research Interests:
Research Interests:
Research Interests:
Research Interests:
Research Interests:
Research Interests:
Research Interests:
G2G - Innovationsachse Graz-Gleisdorf: Entwicklung von Test- und Demonstrationsgebieten im Rahmen von ausgewählten Stadt(teil)entwicklungsvorhaben entlang der Innovationsachse Graz-Gleisdorf mit Fokus auf die Bereiche Energie, integrierte Gebäudetechnologien, smarter Stadtraum, kompakte Siedlungs...more
Research Interests:
Research Interests:
Research Interests:
Research Interests:
Autorinnen und Autoren Wolfgang Streicher, Universität Innsbruck Institut für Konstruktion und Materialwissenschaften, Arbeitsbereich Energieeffizientes Bauen Hans Schnitzer, Michaela Titz, TU Graz, Institut für Prozessund Partikeltechnik... more
Autorinnen und Autoren Wolfgang Streicher, Universität Innsbruck Institut für Konstruktion und Materialwissenschaften, Arbeitsbereich Energieeffizientes Bauen Hans Schnitzer, Michaela Titz, TU Graz, Institut für Prozessund Partikeltechnik Florian Tatzber, Richard Heimrath, Ina Wetz, TU Graz, Institut für Wärmetechnik Stefan Hausberger, TU Graz, Institut für Verbrennungskraftmaschinen und Thermodynamik Reinhard Haas, Gerald Kalt, TU Wien, Institut für Elektrische Anlagen und Energiewirtschaft, Energy Economics Group Andrea Damm, Karl Steininger, Universität Graz Wegener Center for Climate and Global Change Stephan Oblasser, Landesenergiebeauftragter Tirol
Research Interests:
An innovative wastewater and waste-free procedure model for the integrated optimization of galvanisation plants would provide industrial plants with opportunities for sustainable resource management with clear cost reductions. The project... more
An innovative wastewater and waste-free procedure model for the integrated optimization of galvanisation plants would provide industrial plants with opportunities for sustainable resource management with clear cost reductions. The project aims to design a model for the integrated optimisation for galvanising processes. In close cooperation with existing galvanising plants and thus taking into consideration the framework conditions and organisation forms simulation models and material and energy flow analysis are used to develop a model guide for sustainable development and increased resource efficiency in galvanising plants. In the course of this project a method for the optimisation of existing galvanising plants was designed with the objective of zero waste and wastewater production, minimum energy consumption and decreased use of chemicals. In galvanising processes metallic bodies are treated with alkaline and/or acid aqueous solutions, and thin layers of other more precious meta...