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Gewählte Master / Diploma Thesis:

Gerda Weinberger (2006): Energetische Bewertung von Biomethan als Kraftstoff im Vergleich zu Biodiesel (RME) und Bioethanol.
Master / Diploma Thesis, BOKU-Universität für Bodenkultur. UB BOKU obvsg

Data Source: ZID Abstracts
The diploma thesis analysed energy balances of different biofuels (biomethane, biodiesel, bioethanol). For the calculations parameters of energy power plants were used which are planned or actually exist in Austria. The efficiency of the production of biomethane is calculated with silaged maize, silaged grass and green-rye silage. Biodiesel is calculated with rapeseed. The production of bioethanol is calculated with sugar-beet, wheat and corn-cob-mix. For the production of energyplants fossil energy are necessary, which depends on mechanisation design and intensity of agriculture. Direct energy input via diesel (ploughing, drilling, transports) and indirect energy input (fertilizer, pesticide) can be distinguished. The energy consumption for the transport are examined in dependence of the raw material processed. The results show that the energy consumption for tranport is relatively low in comparison to other energy consumption positions (e.g. for cropping, conversion from biomass to biofuel). Depending on energy-crop and biofuel the max. transport distance (where the net energy gain is zero) varies between 295 km and 1288 km. Data about energy demand for the conversation by the different installations are compiled from the literature. The production of bioethanol out of corn-cob-mix and wheat needs the highest amount of energy for conversation. The best ratio of energyinput and ¿output has silaged maize (1:2,6), if there are no couple-products accounted. Silaged grass (1:2,38) and green-rye silage (1:2,27) follow. Production of bioethanol out of sugar-beet has a ratio of 1:2,18 this is much better than bioethanol from wheat (1:1,14) and corn-cob-mix (1:1,34). Biodiesel achieved a ratio of 1:1,56 in these calculations. If there are couple-products accounted the ratio of biodiesel is the best (1:2,91). The input/output-ratio of wheat for bioethanol production improved with consideration of distillers¿ dried grains solubles (DDGS) the ratio up to 1:2,14 like bioethanol from corn-cob-mix (1:2,52). Bioethanol production from sugar beet improves the input/output-ratio to 1:2,60 with consideration of DDGS.

Beurteilende(r): Boxberger Josef

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