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Thermal Insulation in Masonry Walls

Thermal Insulation in Masonry Walls

In hot, dry climates, the thermal mass of masonry walls can be beneficial, absorbing heat during the day and releasing it at night, thereby stabilizing indoor temperatures. However, in most other climates, additional insulation is necessary to enhance thermal resistance.
External insulation can be applied using an Exterior Insulation and Finish System (EIFS), which involves affixing panels of plastic foam to the wall and covering them with a polymeric stucco reinforced with glass fiber mesh....

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Towards Biomimicking Wood: Fabricated Free-standing Films of Nanocellulose, Lignin, and a Synthetic Polycation

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Published on: June 17, 2014

Thermally Insulating Nanocellulose-Based Materials.

Varvara Apostolopoulou-Kalkavoura¹, Pierre Munier¹, Lennart Bergström¹

¹Department of Materials and Environmental Chemistry, Stockholm University, Svante Arrhenius väg 16C, Stockholm, 10691, Sweden.

Advanced Materials (Deerfield Beach, Fla.)

|August 8, 2020

Summary

Renewable nanocellulose materials offer superior thermal insulation for buildings. Cellulose nanomaterial (CNM)-based aerogels and foams exhibit exceptionally low thermal conductivity, outperforming conventional insulation.

Keywords:

aerogels heat transfer nanocellulose phonon scattering thermal insulation

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Published on: May 9, 2019

Area of Science:

Materials Science
Sustainable Building Materials
Nanotechnology

Background:

The building sector's energy consumption and environmental impact necessitate advanced thermal insulation.
Renewable nanomaterials, particularly nanocellulose, show promise for developing high-performance insulating materials.
Cellulose nanomaterial (CNM)-based aerogels and foams are emerging as superior alternatives to conventional insulation like polystyrene and glass wool.

Purpose of the Study:

To describe the fundamental principles of thermal conductivity in porous materials.
To present and discuss the processing, structure, and anisotropic heat transfer properties of novel CNM-based aerogels and foams.
To highlight strategies for achieving extraordinarily low thermal conductivity in CNM-based materials.

Main Methods:

Review of fundamental thermal conductivity principles in porous materials.
Analysis of anisotropic heat transfer in CNMs and aligned CNM films.
Discussion of processing and structural aspects of CNM-based aerogels and foams.
Investigation of Knudsen effect and phonon scattering contributions.

Main Results:

CNM-based aerogels and foams demonstrate significantly lower thermal conductivity compared to commercial insulation.
Anisotropic porous architectures and multicomponent approaches are key to achieving superinsulation.
The Knudsen effect and phonon scattering significantly influence thermal transport in these materials.

Conclusions:

Nanocellulose-based materials offer a sustainable and highly effective solution for thermal insulation in buildings.
Tailoring the porous architecture and composition of CNM materials can lead to unprecedented thermal performance.
Further research into CNM-based materials can drive energy efficiency and reduce the environmental footprint of the construction industry.