crown biomass) and from energy roundwood (ERC, i. In extensive field trials, the storage of spruce wood chips from forest residues (FRC, i. Best storage location for the trials proved to be a rain and wind protected outdoor shelter.įield trials. For the experimental setup of the container trials, modified and perforated storage boxes with a volume of 0.6 m3 were chosen. Additionally, an experimental setup was elaborated by conducting preliminary tests with containers to store wood chips under small scale conditions. Furthermore, this method required the lowest cost and time expenditures. Sampling with balance bags revealed to be the best sampling method for large wood chip piles due to a high measuring resolution and spatial resolution of the results. To develop an experimental setup for large wood chip piles under practical conditions, different sampling techniques were compared in preliminary trials. This information was used to develop a suitable storage design for field trials following the typical storage practice in Bavaria. In addition to collecting information on typical pile form and pile size, storage duration and season, the overall importance of wood chip storage was evaluated. Target groups were district foresters throughout Bavaria and the Centre for Energy Wood (ZfE) of the Bavarian State Forest Enterprise (BaySF), allowing for the assessment of both private and federal forest practice. A survey and expert interviews were conducted to analyse the current situation of wood chip storage in Bavaria. Therefore dry matter losses and different storage effects on fuel quality were investigated. The aim of the project was to conduct extensive research regarding storage and quality assurance of wood chips.

To assess these effects the research project 'Quality preserving storage of wood chips' was carried out by the Technology and Support Centre in the Centre of Excellence for Renewable Resources (TFZ) and by the Bavarian State Institute of Forestry (LWF) over a period of 2.5 years. These effects may pose an economical risk for biomass producers, distributers and users.

However, biological degradation processes during storage can cause high dry matter losses and a decline in fuel quality. As production and consumption of these fuels often occur at different times during the year, the storage of fresh wood chips is an important part of the fuel supply chain. Almost five million loose cubic meters of wood chips from forests are produced in Bavaria annually.

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