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<p>Tropical wood biomass’s thermal properties, influenced by density, porosity, moisture content, and temperature, require precise characterisation for optimal biofuel production and thermal-based applications. In that regard, the thermal properties such as thermal conductivity, thermal diffusivity, and specific heat capacity of Okoume, Bilinga, Movingui, Ozigo, and Nove wood species were investigated using a hot-disk thermal constant analyser. Ozigo has the highest porosity level of 0.82, attributed to its lower bulk density, while Movingui’s porosity is 0.45. The study found that increasing relative humidity significantly affected the thermal conductivity of wood species, with Okoume and Ozigo showing a 69% and 58% increase, respectively. In contrast, Bilinga and Movingui showed a slight decrease. When the samples were oven-dried at 60&#xa0;°C, there was a significant difference in the thermal diffusivity values for all the wood samples, excluding Movingui with 1.13 mm<sup>2</sup>/s. After 103&#xa0;°C oven-drying, the thermal diffusivities of Bilinga, Movingui, and Nove increased with increasing moisture content in the wood. Ozigo and Bilinga had the highest specific heat capacity (Cp) of 1656&#xa0;J/kg/K and 1440&#xa0;J/kg/K, respectively. Ozigo’s higher Cp suggests potentially superior insulation and fire resistance compared to the others. Movingui had the highest thermal conductivity (<i>k</i>) of 0.3050 W/mK, followed by Nove at 0.2750 W/mK, and Okoume was the lowest at 0.1752 W/(m. K), indicating less effectiveness in heat transmission. Movingui exhibited the highest thermal diffusivities at both oven-dry temperatures. The study reveals that the high thermal conductivity and diffusivity of Movingui, Ozigo, Okoume, and Nove can enhance thermochemical conversion processes. In contrast, moderate thermal properties could be used as complementary feedstocks in blended biofuel systems, enhancing efficiency and sustainability. Future research should examine the biochemical composition of these wood species to assess their efficiency in biofuel conversion processes, optimise their utilisation as feedstocks, and evaluate their environmental impacts for sustainability and economic viability.</p>

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Thermal properties of some African tropical woods: Okoume, Bilinga, Movingui, Ozigo, and Nove and their potential in bioenergy utilisation

  • 期刊论文

  • 发表日期：

    2025年3月11日

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  • Abdulwasiu Muhammed Raji,
  • Brady Manescau,
  • Khaled Chetehouna,
  • Leo Courty,
  • Serge Ekomy Ango,
  • Stéphane Bernard

摘要

Tropical wood biomass’s thermal properties, influenced by density, porosity, moisture content, and temperature, require precise characterisation for optimal biofuel production and thermal-based applications. In that regard, the thermal properties such as thermal conductivity, thermal diffusivity, and specific heat capacity of Okoume, Bilinga, Movingui, Ozigo, and Nove wood species were investigated using a hot-disk thermal constant analyser. Ozigo has the highest porosity level of 0.82, attributed to its lower bulk density, while Movingui’s porosity is 0.45. The study found that increasing relative humidity significantly affected the thermal conductivity of wood species, with Okoume and Ozigo showing a 69% and 58% increase, respectively. In contrast, Bilinga and Movingui showed a slight decrease. When the samples were oven-dried at 60 °C, there was a significant difference in the thermal diffusivity values for all the wood samples, excluding Movingui with 1.13 mm2/s. After 103 °C oven-drying, the thermal diffusivities of Bilinga, Movingui, and Nove increased with increasing moisture content in the wood. Ozigo and Bilinga had the highest specific heat capacity (Cp) of 1656 J/kg/K and 1440 J/kg/K, respectively. Ozigo’s higher Cp suggests potentially superior insulation and fire resistance compared to the others. Movingui had the highest thermal conductivity (k) of 0.3050 W/mK, followed by Nove at 0.2750 W/mK, and Okoume was the lowest at 0.1752 W/(m. K), indicating less effectiveness in heat transmission. Movingui exhibited the highest thermal diffusivities at both oven-dry temperatures. The study reveals that the high thermal conductivity and diffusivity of Movingui, Ozigo, Okoume, and Nove can enhance thermochemical conversion processes. In contrast, moderate thermal properties could be used as complementary feedstocks in blended biofuel systems, enhancing efficiency and sustainability. Future research should examine the biochemical composition of these wood species to assess their efficiency in biofuel conversion processes, optimise their utilisation as feedstocks, and evaluate their environmental impacts for sustainability and economic viability.