Knubbved istället för vanlig ved? : slutrapport från projekt Styckeved för småskalig eldning

• Chunkwood is a wood fuel with a fuel particle length between 50 and 150 mm, i.e. with a size between wood chips and conventional firewood. Chunkwood can be produced and handled as rational as wood chips and can dry during storage like conventional firewood. This is known since long. In project Smallwood for small scale heating we have investigated if chunkwood can be used in a small scale as a fuel for heating detached houses in conventional firewood boilers as well as automatically fed to a boiler in a similar way as wood chips. We have also compared complete systems for small scale production, distribution and heating with chunkwood, wood chips and conventional firewood. Storage of chunkwood produced for testing small scale boilers confirmed that chunkwood can dry during storage at least as good as conventional firewood. Tests in different boilers for detached homes showed that chunkwood can be used in conventional firewood boilers as well as in automatically fed wood chips boilers. Chunkwood can be delivered to the customer to the same or lower cost as wood chips and firewood, but need much less handling by the customer than conventional firewood. However, if chunkwood is used in a conventional firewood boiler, it needs some handling by shovel and wheelbarrow. Technical development of handling from the storage to the boiler is needed. In a somewhat larger scale, e.g. a boiler for apartment blocks or a small district heating system, chunkwood should be very interesting as a replacement of fuel pellets or fuel briquettes. It would be interesting with some projects, which in this scale demonstrates the whole system from the forest to heat.

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