Performance assessment of a secondary concentrator for solar tower external receivers

Schöttl, Peter; Zoschke, Theda; Frantz, Cathy; Gilon, Yoel; Heimsath, Anna; Fluri, Thomas

doi:10.1063/1.5117564

Cited by 4 publications

(2 citation statements)

References 7 publications

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“…These act as an input to the thermal receiver model and system simulation. Another SolarPACES 2018 paper describes this approach in more detail [3].…”

Section: Optical Simulation With Raytrace3dmentioning

confidence: 99%

Techno-economic assessment of new material developments in central receiver solar power plants

Zoschke

Frantz²,

Schöttl

et al. 2019

SOLARPACES 2018: International Conference on Concentrating Solar Power and Chemical Energy Systems

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For the evaluation of functional material developments in the EU-project RAISELIFE, a tool chain of ray tracing, thermal FEM simulation and dynamic system simulation has been created. Multi-year simulations allow considering degradation of optical parameters. With this tool chain, the thermal energy output of a reference plant with one non-selective and one generic selective coating was simulated. The LCOE (Levelized Cost of Electricity) was calculated based on these results. The LCOE of the selective coating is 2.6 % lower, if the same costs are assumed. Furthermore, the ideal recoating interval for the reference system was identified. Finally, it was demonstrated that dynamic system simulation shows benefits to evaluate in-service performance of functional materials as dynamic behavior of solar thermal power plants can change quite significantly, if another coating is used.

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“…These act as an input to the thermal receiver model and system simulation. Another SolarPACES 2018 paper describes this approach in more detail [3].…”

Section: Optical Simulation With Raytrace3dmentioning

confidence: 99%

Techno-economic assessment of new material developments in central receiver solar power plants

Zoschke

Frantz²,

Schöttl

et al. 2019

SOLARPACES 2018: International Conference on Concentrating Solar Power and Chemical Energy Systems

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“…A secondary reflector which is installed adjacent to the solar tower or linear Fresnel collector receiver can improve the optical efficiency of the system considerably as well as reducing its cost by [2]:…”

Section: Introductionmentioning

confidence: 99%

HiPIMS and DC Magnetron Sputter-Coated Silver Films for High-Temperature Durable Reflectors

et al. 2019

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High-temperature durable mirrors based on a protected silver sputter coating are attractive for secondary reflector applications in concentrated solar thermal power plants. In this paper, silver films are deposited by high-power impulse magnetron sputtering (HiPIMS) and standard direct current (DC) magnetron sputtering, either as exposed discretely deposited films or in-sequence-deposited thin film systems, where the silver is protected and embedded between adhesion and barrier layers. The unprotected silver films and equivalent protected silver thin film systems are compared and characterized as deposited and after 400 °C oven temperature exposure. The reflectance is measured and grazing incident X-ray diffraction (GIXRD) and scanning electron microscopy (SEM) pictures were taken. The HiPIMS silver film, sputtered with a peak current of 200 A and an approximately equivalent average power density to the DC magnetron sputtered silver, exhibits higher reflectance (and conductivity). Increasing the power density further, yields silver films with lower reflectance, correlating to a reduced grain size. In the protected silver film system, the reflectance does not improve, due to the presence of a less reflective top adhesion layer. The protected film system, with the 200 A HiPIMS, is, however, more durable at 400 °C than the DC magnetron sputtered equivalent.

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Heliostat layout optimization for load-following solar tower plants

et al. 2021

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Performance assessment of a secondary concentrator for solar tower external receivers

Cited by 4 publications

References 7 publications

Techno-economic assessment of new material developments in central receiver solar power plants

Techno-economic assessment of new material developments in central receiver solar power plants

HiPIMS and DC Magnetron Sputter-Coated Silver Films for High-Temperature Durable Reflectors

Heliostat layout optimization for load-following solar tower plants

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