Optimization of Thermal Conductivity vs. Bulk Density of Steam-Exploded Loose-Fill Annual Lignocellulosics

Lignocellulosic biomass (LCB)-based thermal insulation materials available in the market are more expensive than conventional ones and consist mainly of wood or agricultural bast fibers which are primarily used in construction and textile industries. Therefore, it is crucial to develop LCB-based the...

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Published in:Materials 2023-05, Vol.16 (10), p.3654
Main Authors: Tupciauskas, Ramunas, Berzins, Andris, Pavlovics, Gunars, Bikovens, Oskars, Filipova, Inese, Andze, Laura, Andzs, Martins
Format: Article
Language:English
Subjects:
Biomass
Bulk density
Cellulose
Climate change
Corn
Energy consumption
Environmental policy
Fourier transforms
Germany
Global temperature changes
Green buildings
Greenhouse gases
Heat conductivity
Heat transfer
Insulation
Latvia
Lignin
Lignocellulose
Microscopy
Moisture content
Optimization
Particle size
Polynomials
Raw materials
Recycling (Waste, etc.)
Reeds
Steam explosions
Temperature
Thermal conductivity
Thermal insulation
Vegetable fibers
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Summary:Lignocellulosic biomass (LCB)-based thermal insulation materials available in the market are more expensive than conventional ones and consist mainly of wood or agricultural bast fibers which are primarily used in construction and textile industries. Therefore, it is crucial to develop LCB-based thermal insulation materials from cheap and available raw materials. The study investigates new thermal insulation materials from locally available residues of annual plants like wheat straw, reeds and corn stalks. The treatment of raw materials was performed by mechanical crushing and defibration by steam explosion process. Optimization of thermal conductivity of the obtained loose-fill thermal insulation materials was investigated at different bulk density levels (30-45-60-75-90 kg m ). The obtained thermal conductivity varies in range of 0.0401-0.0538 W m K depending on raw material, treatment mode and a target density. The changes of thermal conductivity depending on density were described by the second order polynomial models. In most cases, the optimal thermal conductivity was revealed for the materials with the density of 60 kg m . The obtained results suggest the adjustment of density to achieve an optimal thermal conductivity of LCB-based thermal insulation materials. The study also approves the suitability of used annual plants for further investigation towards sustainable LCB-based thermal insulation materials.
ISSN:1996-1944
1996-1944
DOI:10.3390/ma16103654