University of Natural Resources and Life Sciences, Vienna (BOKU) - Research portal
Gewählte Master / Diploma Thesis:
Alfred Riezinger
(2008):
Ermittlung der Ökoeffizienz der Bereitstellungskette von Waldhackgut anhand ausgewählter Fallstudien.
Master / Diploma Thesis,
BOKU-Universität für Bodenkultur,
pp 58.
UB BOKU
obvsg
FullText
- Abstract:
- Producing energy or heat out of biomass ¿ wooden chips ¿ is up to date. The ecological efficiency of the supply chain of forest-chips is often noticed marginally. A confirmation of this efficiency will be necesary in the long term concerning sustainability. The basis for this paper was a review in literature and interviews of experts. There was created an simplyfied method for calculating the input of energy and the emissions of CO2 . The most important input factors are the life cycle of the machines and the fuel consumption. The system borders depend on the considered raw material. If the wooden chips derive from forest residues, the bilance starts in the process which is especially operated because of the supply chain for chips. So the processes felling and skidding weren¿t calculated in the asessment, as they belong to logging. Are the chips made of energy wood, all processes incipient by the production of wood until the transport are included. Are the chips made from energy wood, the most important factor is the productivity of the harvester, followed by the productivity of the chipper. In the analyzed supply chains of energy wood (water content 35%) 9.6% of the heating value was expended for the supply chain and 5.4% of the retained CO2 was emitted. In the analyzed supply chains (forest residues, skidding by cable line, whole tree), the production of wood and the felling were excluded, only 2.4% of the energy content was expended and 1.6% of the retained CO2 was emitted.
- Beurteilende(r): Stampfer Karl