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Gewählte Master / Diploma Thesis:

Eva Höllbacher (2011): Klassifizierung von Waldhackgut Vergleich zwischen ÖNORM M 7133 und ÖNORM EN 14961-1.
Master / Diploma Thesis - Institut für Holzforschung (IHF), BOKU-Universität für Bodenkultur, pp 86. UB BOKU obvsg

Data Source: ZID Abstracts
In Austria Forest Wood Chips are a very important raw material for the production of heat energy in heating plants of medium to high range of capacity. So far Forest Wood Chips were standardised by the ÖNORM M 7133 „ Chipped wood for energetic purposes – Requirements and test specifications“. Now this standard is replaced by the European Standard ÖNORM EN 14961-1 „Solid Biofuels – Fuel specifications and classes“. This master thesis generates a comparison between the standards by analysing 71 samples from the whole of Austria. Size distribution, water content, bulk density and ash content are analysed and classified according to the classification schemes of the standards. The biggest problems can be found within the classification of size distribution. Both standards show high amounts of non-classifiable arrays. The amount is even higher for the ÖNORM M 7133. This is due to the strict limiting values not respecting the typical characteristics of Forest Wood Chips. Within the bulk density classification the most important difference ist the reference basis. ÖNORM M 7133 demands the bulk density on dry matter, ÖNORM EN 14961-1 demands the bulk density at delivery. Therefore the classification schemes are only comparable, if the water content is considered. The classification schemes for water content are nearly identical and therefore easy to compare.

Beurteilende(r): Teischinger Alfred

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