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Characterization of Thermal Transport in One-dimensional Solid Materials
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Heat Transfer in Straw-Based Thermal Insulating Materials.

Dániel Csanády1, Olivér Fenyvesi1, Balázs Nagy1

  • 1Department of Construction Materials and Technologies, Budapest University of Technology and Economics, 3 Műegyetem Rakpart, 1111 Budapest, Hungary.

Materials (Basel, Switzerland)
|August 27, 2021
PubMed
Summary

A new model accurately predicts heat transfer in raw straw bulks, crucial for developing efficient straw-based insulation and walls. Optimal bulk density for barley and wheat straw insulation was found to be 120 kg/m³.

Keywords:
heat transfernatural fibersphysical propertiesporosityraw barley and wheat strawthermal conductivity

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Area of Science:

  • Materials Science
  • Thermal Engineering
  • Sustainable Building Materials

Background:

  • Straw-based materials offer sustainable insulation potential.
  • Accurate thermal performance data is needed for effective building applications.
  • Existing models may not fully capture the complexities of raw straw's thermal properties.

Purpose of the Study:

  • To develop and validate an analytic-empirical model for heat transfer in raw straw bulks.
  • To determine the key factors influencing the thermal conductivity of barley and wheat straw.
  • To identify the optimal bulk density for straw insulation.

Main Methods:

  • Laboratory experiments were conducted on raw barley and wheat straw bulks.
  • Thermal conductivity was measured across a bulk density range of 80-180 kg/m³.
  • An analytic-empirical model was developed, incorporating solid conduction, gas conduction, and radiation, with empirical flatness factors.

Main Results:

  • The developed model demonstrated good agreement with measured thermal conductivities.
  • Key thermal conductivity factors include straw type, bulk density, stem density, porosity, and radiation.
  • Optimal bulk density for both barley and wheat straw was determined to be approximately 120 kg/m³.

Conclusions:

  • The analytic-empirical model provides a reliable method for assessing the thermal performance of straw insulation.
  • Understanding the interplay of physical properties and thermal factors is essential for optimizing straw-based building materials.
  • The findings support the use of raw straw as an effective and sustainable insulation material.