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Analysis of the Thermal Conductivity of a Bio-Based Composite Made of Hemp Shives and a Magnesium Binder

Author

Listed:
  • Michał Kubiś

    (Faculty of Power and Aeronautical Engineering, Institute of Heat Engineering, Warsaw University of Technology, Nowowiejska St. 21/25, 00-665 Warsaw, Poland)

  • Piotr Łapka

    (Faculty of Power and Aeronautical Engineering, Institute of Heat Engineering, Warsaw University of Technology, Nowowiejska St. 21/25, 00-665 Warsaw, Poland)

  • Łukasz Cieślikiewicz

    (Faculty of Power and Aeronautical Engineering, Institute of Heat Engineering, Warsaw University of Technology, Nowowiejska St. 21/25, 00-665 Warsaw, Poland)

  • Genadijs Sahmenko

    (Faculty of Civil Engineering, Institute of Materials and Structures, Riga Technical University, Kalku St. 1, LV-1658 Riga, Latvia)

  • Maris Sinka

    (Faculty of Civil Engineering, Institute of Materials and Structures, Riga Technical University, Kalku St. 1, LV-1658 Riga, Latvia)

  • Diana Bajare

    (Faculty of Civil Engineering, Institute of Materials and Structures, Riga Technical University, Kalku St. 1, LV-1658 Riga, Latvia)

Abstract

The evolution of bio-based composites in the building industry is strongly linked with the growing demand for sustainable development, which is relevant nowadays. Hemp shives are a large group of organic residues that are obtained in the process of oil extraction as well as straw processing. These residues could be utilized along with a binder as constituents in the manufacture of bio-based building composites. This study is focused on the impact of density and relative humidity on the effective thermal conductivity of hemp shive-based bio-composites with a magnesium binder. For this reason, a series of samples with variable densities was manufactured and subjected to conditioning in a climatic chamber at a constant temperature and different relative humidity settings. As soon as samples were stabilized, the guarded hot plate method was applied to determine their thermal conductivities. Before each measurement, great care was taken during sample preparation to ensure minimum moisture loss during long-lasting measurements. The results showed that an increase in sample density from 200 kg/m 3 to 600 kg/m 3 corresponded to up to a three-fold higher composite thermal conductivity. In the case of sample conditioning, a change in relative humidity from a very low value to 90% also resulted in almost 60% average higher thermal conductivity.

Suggested Citation

  • Michał Kubiś & Piotr Łapka & Łukasz Cieślikiewicz & Genadijs Sahmenko & Maris Sinka & Diana Bajare, 2022. "Analysis of the Thermal Conductivity of a Bio-Based Composite Made of Hemp Shives and a Magnesium Binder," Energies, MDPI, vol. 15(15), pages 1-11, July.
    • Handle: RePEc:gam:jeners:v:15:y:2022:i:15:p:5490-:d:874833
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    References listed on IDEAS

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    1. Olga Beatrice Carcassi & Pietro Minotti & Guillaume Habert & Ingrid Paoletti & Sophie Claude & Francesco Pittau, 2022. "Carbon Footprint Assessment of a Novel Bio-Based Composite for Building Insulation," Sustainability, MDPI, vol. 14(3), pages 1-23, January.
    2. Piotr Kosiński & Przemysław Brzyski & Maria Tunkiewicz & Zbigniew Suchorab & Damian Wiśniewski & Paweł Palczyński, 2022. "Thermal Properties of Hemp Shives Used as Insulation Material in Construction Industry," Energies, MDPI, vol. 15(7), pages 1-18, March.
    3. Ifeoluwa Adesina & Arnab Bhowmik & Harmandeep Sharma & Abolghasem Shahbazi, 2020. "A Review on the Current State of Knowledge of Growing Conditions, Agronomic Soil Health Practices and Utilities of Hemp in the United States," Agriculture, MDPI, vol. 10(4), pages 1-15, April.
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