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FRIENDS2 Report Summary

Project ID: 645725
Funded under: H2020-EU.1.3.3.

Periodic Reporting for period 1 - FRIENDS2 (Framework of Innovation for Engineering of New Durable Solar Surfaces)

Reporting period: 2015-01-01 to 2016-12-31

Summary of the context and overall objectives of the project

FRIENDS2 is a new Marie Skłodowska-Curie staff exchange project (RISE scheme) within Horizon 2020, the EU Framework Programme for Research and Innovation, which promotes international and inter-sectorial collaboration between two academic partners (Helmholtz-Zentrum Dresden-Rossendorf, a research institution from Germany, and Cranfield University from the United Kingdom) and two industrial partners (Metal Estalki, a Spanish SME, and the international company Abengoa) to develop new coatings for the thermo-solar power industry. On 22nd January 2015, the FRIENDS2 project took off with all the partners getting together in Seville, Spain, to discuss the next steps (Figure 1). The two-day opening meeting was hosted by Abengoa Research, where the project objectives and specific roles were discussed and defined.

The main scientific topic of FRIENDS2 deals with the development of new materials to be used in Concentrating Solar Power (CSP) technology. CSP is a commercially available technology in the field of renewable energy, which is based on the conversion of concentrated solar energy into thermal and subsequently electrical energy. The main requirements for future development and application of CSP technology are the improvement of its overall efficiency and the reduction of costs per kWh. The former objective can be directly achieved by increasing the operation temperature of CSP tower plants from today’s maximum of 550°C to 800°C. The cost reduction will result indirectly from the higher energy efficiency, the improved durability, and moreover from lower manufacturing prices of the key components.
The key components responsible for the solar to thermal energy conversion efficiency of CSP tower plants are 1) the solar absorber, 2) the concentrating mirrors, and 3) the heat-transfer fluid transport and storage system (Figure 2). Their performance improvement and durable long-term temperature and chemical stability are the scientific objectives of the FRIENDS2 project.

Figure 2. - Photograph of the Abengoa PS20 CSP tower plant (left) and schematic illustration of three CSP key components, which are the innovation targets of FRIENDS2 (right).

The specific technological objectives of FRIENDS2 as described in the DoA are:
1) Simulation and tuning of the optical properties of front surface multilayer mirrors in order to achieve high reflectance through the development of new approaches for high reflectivity and lower outdoor mirrors costs by means of depositing multilayer stacks by PVD and sol-gel routes.
2) Simulation and tuning of the optical properties of the receiver tube coatings in order to achieve high absorbance and low emittance at high temperature.
3) Manufacturing and validation of new coating concepts for absorber, selective and antireflective materials for high temperature (> 600oC) operation.
4) Inter-laboratory comparison of the application of both PVD and sol-gel deposited layers in the development of solar optical coatings.
5) Design and manufacturing of protective coatings capable of improving the corrosion resistance of steel components in contact with molten salts.
6) Development of an in-situ methodology for laboratory testing of the thermal and environmental stability as well as the optical properties of new layers at high temperature.
7) Development of a complete validation protocol for absorber and reflector coatings including in situ characterization approaches and field testing.
8) Comprehensive study of the environmentally induced structural changes and diffusion in the deposited coatings (absorber coatings, metal-dielectric multilayers and NiAl-based coatings).
9) Development of a scaling up concept of the optimized laboratory deposition process to industry relevant size and throughput level, including project and cost management of an industrial deposition processes.
These objectives are covered within scientific work packages (WP) 1-4 of the project. In WP1 new solar absorber coatings (labeled

Work performed from the beginning of the project to the end of the period covered by the report and main results achieved so far

For more information see the attached report

Progress beyond the state of the art and expected potential impact (including the socio-economic impact and the wider societal implications of the project so far)

For more information see the attached report
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