Industrial and academic research centres requires accurate and reliable knowledge of the behaviour of the
materials to sustain the specific challenges from the conditions present in CSP applications:
• High temperatures (up to 1000° C in current solar towers design)
• High spatial thermal gradient (mainly due to the non-uniform concentrated solar irradiation)
• High dynamic thermal gradient (e.g. fast during cloud passing or slow due to the daily cycling from dawn and
A better evaluation of the material behaviour for CSP applications, such as high temperature steels or SiC
ceramics, thanks to better or new experimental test beds and associated theoretical models will help users
develop higher performance materials for higher efficiency of the process.
A better evaluation of the material behaviour for CSP applications will also lead to better estimations of the
operating cost of innovative concentrated solar power plants newly proposed or developed, such as towers
with pressurized air turbines for high efficiency electricity production or with high temperature thermochemical
processes for synthetic fuel production.

This work package therefore aims at improving the characterisation of physical properties that researchers and
developers require to define the behaviour of materials for CSP applications.

Three major areas are addressed:
Task 1: Determination of thermo-mechanical properties under concentrated solar radiation.
This task aims for:
• Define and validate new methodologies for comparative evaluation of the ability of high temperature key CSP
components to sustain cyclic thermal gradient
• Improve CSP Test facilities by developing new instruments and methods for in-situ thermo-mechanical
investigation using acoustic methods

Task 2: Determination of thermo-optical properties: spectral directional emissivity measurements at high
This task aims at improving the determination of the emissivity of CSP materials at different spectral
wavelengths and from different directions notably for the range of temperature for CSP applications.

Task 3: Determination of key properties in the case of porous materials in CSP applications.
This task aims for:
• Adaptation of methods to characterize physical and chemical surface properties inside the cavities of porous
materials to determine the real history and modifications of the material after use in CSP applications.
• Upgrading concentrating solar test beds and methods to experimentally evaluate heat transfer coefficient for
porous materials for volumetric solar receivers.
• Extending for new porous materials an existing method to predict heat and mass transfer properties with
theoretical models from an accurate geometry evaluation by computer tomography.