Thermal conductivity of cellular and granular porous building blocks

Researchers at KU Leuven have used gSKIN® Heat Flux Sensors to measure the heat transfer though both cellular and granular porous building blocks. The research has been published in Construction and Building Materials.

Implementation and validation of a 3D image-based prediction model for the thermal conductivity of cellular and granular porous building blocks in Construction and Building Materials, Vol. 182

Authors: Wouter Van De Walle, Steven Claes, Hans Janssen

Abstract

Porous building blocks are increasingly being used in the building sector, as they offer a relatively high thermal resistance because of their porous microstructure. A clear understanding of the relation between the material’s microstructural properties and effective thermal conductivity is still lacking though, impeding a correct analysis and design of existing and new porous building blocks. Therefore, this paper presents a 3D model framework to study the heat transfer through both cellular and granular porous building blocks, performing simulations directly at the pore scale. A 3D voxel-grid representation of the pore structure is adopted, allowing to study both virtually generated materials and actually available materials. The accuracy and the impact of the grid parameters is verified on a set of elementary microstructures, demonstrating a good performance when using adequate settings. The thermal conductivity simulation framework is validated against experimental measurements on two highly different porous materials: a low-porosity granular sintered glass filter and a highly-porous cellular-granular acoustic absorber. Comparison of simulation outcomes with experimental results confirms the good performance of the model, indicating its potential to evaluate and optimize the thermal conductivity of porous building blocks.

 

More news

gO Mess-System Übersichtsposter

Read more

Local heat distributions in Li-ion batteries characterized precisely with new method

Read more

Wärmespeicherfähigkeit von Bauteilen messen

Read more

Step-by-Step Checklist for Easy U-value Measurements

Read more

Core Body Temperature Monitoring for Better Performance in Sports

Read more

Lowering Emissivity of Concrete Roof Tile’s Underside Cuts Down Heat Entry to the Building

Read more

gO Measurement System and Hot Box / Cold Box Experiments

Read more

Elevating low-emissivity film for lower thermal transmittance

Read more
Read all