DS0305 -

Characterization of elementary components of thermal insulators based on glass. – CarISOVERRE

Submission summary

Thermal insulating materials such as glass wool are generally composed of a complex network of micro and/or nanosized glass fibers or grains. They are characterized in industrial laboratories using macroscopic methods which measure the thermal transport properties of large pieces of material. Today, these methods fail to provide enough knowledge about the heat transfer mechanisms at play on the microscopic scale within the materials to further improve their performances, which is a major concern to save energy on a large scale.

CarISOVERRE aims at proposing novel metrological methods which will allow one to study the thermal transport at the scale of one or a few glass fibers or grains. Using tools available in nanotechnologies, we will develop advanced methods based on thermoresistive measurements and infrared near-field and far-field measurements to investigate the heat transfers. We will characterize the materials starting from one single thermal insulating element (TIE), i.e. one fiber or one grain. We will then study heat transfers between two or three TIEs in solid-solid contact or at close distance, and eventually more complex systems made of several TIEs. Changing the experimental conditions (wet air, dried air, vacuum, distance between TIEs, etc.) we will be able to fully explore the heat transfer channels which enter into play in and between TIEs. This microscopic approach will serve as a basis for the elaboration of a full multi-scale theoretical description taking into account all the heat transfer mechanisms at play in systems of TIEs: solid & gas conduction (or even liquid is a meniscus is present at the contact ), conducto-convection, far-field & near-field radiative heat transfers.

The final goal is to acquire new knowledge useful for the production of very high performance insulating materials, and to dispose of metrological methods transferable to industrial laboratories for microscopic characterization of thermal insulating materials.

CarISOVERRE involves three academic partners, Institut Langevin, Institut Néel, and Institut P’, which have a renowned expertise on microscale and nanoscale heat transfers and thermal properties of materials, and an industrial partner, the French company Saint Gobain, which is the world leader for insulating products, among which glass wool.

Project coordination

Yannick DE WILDE (Institut Langevin - ESPCI Paris)

The author of this summary is the project coordinator, who is responsible for the content of this summary. The ANR declines any responsibility as for its contents.

Partner

SAINT GOBAIN RECHERCHE
CNRS-PPRIME Institut Pprime
NEEL INSTITUT NEEL - CNRS
IL Institut Langevin - ESPCI Paris

Help of the ANR 499,163 euros
Beginning and duration of the scientific project: November 2016 - 42 Months

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