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Validation of Prediction Models for Estimating the Moisture Content of Small Diameter Stem Wood

Johanna Routa ; Natural Resources Institute Finland, Luke P.O. Box 68, FI-80101 Joensuu FINLAND
Marja Kolström ; University of Eastern Finland, School of Forest Sciences P.O. Box 111, FI-80101 Joensuu FINLAND
Johanna Ruotsalainen ; Finnish Meteorological Institute, Aviation and Military Services Yliopistonranta 1 F, 70210 Kuopio FINLAND
Lauri Sikanen ; Natural Resources Institute Finland, Luke P.O. Box 68, FI-80101 Joensuu FINLAND

Puni tekst: engleski pdf 1.267 Kb

str. 283-291

preuzimanja: 444



Moisture is the most important factor influencing the quality and calorific value of fuel wood. Drying models for estimating the optimal storage time based on average moisture change in fuel wood stacks stored outdoors have been developed for different stem wood piles. Models are an easy option for making an estimate of the moisture content of an energy wood pile if compared with sampling and measuring the moisture of samples. In this study, stem wood models were validated against data from forest companies. Fourteen reference piles of covered pine stem wood and 8 piles of uncovered pine stem wood were studied. The results of the validation are promising. The difference between the measured and modelled moisture was on average only 0.3% with covered piles and 2.5% with uncovered piles. The models presented can be implemented in every location in Finland, because the Finnish Meteorological Institute has a database for interpolated meteorological observations covering the whole country in a 10 km x 10 km grid. For international use, model parameters need to be estimated case by case, but it should also be possible to implement the approach itself worldwide.

Ključne riječi

energy wood; quality; storing; natural drying; model validation

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