Storage for Solar and energetic processes
Science Policy - Objectives
The activity of the SHPE team (Storage for Photochemical and Energetic, Helio-processes) is part of an overall objective relative to performance optimization of solar processes and concerns various fields of application (Fig. 1): the solar "thermodynamics" associating concentration of radiation and energy production cycle, solar thermal for the direct storage of heat at low temperature, solar photochemistry with applications devoted to the water treatment by advanced oxidation process or biomass production. Given the breadth of scientific issues, the involvement in the detailed working mode of the solar process is at different levels depending on the applications. In most cases, the preferred route for an improvement of the process performance is the development of adapted and integrated storage systems. The efficiency, reliability and security of processes based on the use of the solar resource that is intrinsically transient and discontinuous, are indeed very often linked to the ability to design, dimension and operate effective storage systems. The objective is then to limit the disadvantageous influence of the resource intermittency whether it is predictable and well defined as the day / night cycles or highly unpredictable and transient as cloudy conditions and variations due to local weather fluctuations (Fig. 2). These discontinuities entail operating conditions that are necessary dynamic, different of the nominal dimensioning and adverse effects as, for an example, a high level of thermo-mechanical stresses for high temperature processes. In any cases, it is necessary to take into account the adapted time scales relevant for the definition of the storage system ( Fig. 3) and to compare the storage option with the principle of hybridation that consists in a substitution of the solar source by a conventional energy (oil, gas, electricity).
Given these general objectives that cover the whole activity of the team, two themes are currently particularly investigated. The first concerns the development of a complete pathway, based on the recovery of materials at the end of their life cycle, for the integration of high temperature energy storages (200 to 1000 ° C) for solar plants and similar processes. The second is relative to solar photochemistry, and concerns the control and optimization of treatment for polluted effluents including mass storage with adsorbent materials.
These goals require the development of scientific and technologic means according to the following research themes and related to both: Materials Science and Process Engineering.
- Development of sustainable materials promoting recycling way up with low energetic and environmental impacts. Provide new uses for recycled material from waste.
- Materials characterization according to the use properties.
- Development of experimental sets up and prototypes at representative scale.
- Development of numerical tools, simulating and dimensioning means; development of temporal and geometric scaling methods.
Vincent GOETZ, DR2 CNRS, Team leader
Chloe DEZANI (since 2017)
Najim SADIKI, Convention d'accueil MEN