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Conversion factors for residential wood energy in the European Union: an introduction to harmonizing units of measurement

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  • Glasenapp, S.
  • Fonseca, M.
  • Weimar, H.
  • Döring, P.
  • Aguilar, F.X.

Abstract

Wood energy data are reported in forest products and energy statistics but current use of heterogeneous units can result in major inconsistencies. Harmonization of wood energy statistics can benefit data quality and improve measuring sustainable practices, better informing policy-makers and analyzing feedstock competition. Harmonization of wood energy data and subsequent application in the forest product and energy sectors require appropriate conversion factors. We provide conversion factors for forest energy products relative to weight and volume for the residential sectors of EU28 member states. Selected forest products include wood from primary, secondary and tertiary sources considering differences in properties affecting conversion factors. Proposed conversion factors were derived from information on moisture content, heating value, density and changes in wood volumes due to swelling and shrinkage of wood. Heating values relative to weight denote conversion factors to transform weight to energy units that ranged from 13.88 to 17.14 MJ/kg. Computation of heating values relative to volume ranged from 7316 to 11,053 MJ/m³. The use of extreme conversion factors in a sensitivity assessment showed that the ranges between minimum and maximum values accounted for as much as 27% of total wood energy consumption. Application of conversion factors to EU28 residential wood energy consumption revealed inconsistencies between forest products and energy statistics. Closer collaboration between experts and use of universal conversion factors at national levels will likely improve data quality and direct comparability. Conversion factors used in the residential sector can facilitate harmonization in non-residential sectors, but sector-specific product characteristics require further adjustment.

Suggested Citation

  • Glasenapp, S. & Fonseca, M. & Weimar, H. & Döring, P. & Aguilar, F.X., 2021. "Conversion factors for residential wood energy in the European Union: an introduction to harmonizing units of measurement," Renewable and Sustainable Energy Reviews, Elsevier, vol. 138(C).
    • Handle: RePEc:eee:rensus:v:138:y:2021:i:c:s1364032120307772
    DOI: 10.1016/j.rser.2020.110491
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    1. Ramanauske, Neringa & Balezentis, Tomas & Streimikiene, Dalia, 2023. "Biomass use and its implications for bioeconomy development: A resource efficiency perspective for the European countries," Technological Forecasting and Social Change, Elsevier, vol. 193(C).
    2. Mariusz Jerzy Stolarski & Paweł Dudziec & Ewelina Olba-Zięty & Paweł Stachowicz & Michał Krzyżaniak, 2022. "Forest Dendromass as Energy Feedstock: Diversity of Properties and Composition Depending on Systematic Genus and Organ," Energies, MDPI, vol. 15(4), pages 1-60, February.

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