Dynamic photogrammetry applied to a real scale heliostat: Insights into the wind-induced behavior and effects on the optical performance

Blume, Kristina; Röger, Marc; Schlichting, Tim; Macke, Ansgar; Pitz‐Paal, Robert

doi:10.1016/j.solener.2020.10.056

Cited by 13 publications

(14 citation statements)

References 11 publications

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“…The conducted field study included simultaneous wind and pressure measurements of a pentagonal Stellio heliostat which was installed on the heliostat testing platform (HeliTep) at the DLR site in Juelich. Further information on the HeliTep and the Stellio heliostat can be found in Blume et al (2020), Balz et al (2016) or Nieffer et al (2019). The wind and pressure data was recorded over several individual 10-minute measurement periods.…”

Section: Experimental Methodsmentioning

confidence: 99%

“…In more detail, it links the power spectral densities 𝑆, also simply termed spectra, of the wind speed and the dynamic load. An analytical model of the aerodynamic admittance |𝜒 𝑎 (𝑓 )| 2 was derived in Blume et al (2023) and reads 𝜕𝛽 denote the derivatives of the aerodynamic load coefficient with respect to the angles of attack, evaluated at the mean angles of attack of the respective measurement period.…”

Section: Data Processingmentioning

confidence: 99%

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Full-scale investigation of heliostat aerodynamics through wind and pressure measurements at a pentagonal heliostat

Blume

Röger²,

Pitz‐Paal

2023

Solar Energy

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Section: Experimental Methodsmentioning

confidence: 99%

Section: Data Processingmentioning

confidence: 99%

Full-scale investigation of heliostat aerodynamics through wind and pressure measurements at a pentagonal heliostat

Blume

Röger²,

Pitz‐Paal

2023

Solar Energy

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“…Metrology Laser scanning techniques [42] Available Photogrammetry, deflectometry and reflectometry techniques [43]- [46], [47] Available…”

Section: Heliostat Shapementioning

confidence: 99%

“…An example of this tolerance is given with a heliostat 1 km away from a target, where a 1mrad tracking error would put a beam 2 m away from the desired aim point. Tracking errors can source from gravity bending, gear ratios and backlash, pivot point offset, dust refraction, angular offset, levelling and other installation errors in the heliostat, poor installation of the torque tube relative to the pedestal, poor heliostat design relative to wind and mass loads, low encoder resolution, and even disagreements between unit systems used by different engineering groups [18], [43], [44], [45]. Of these errors, gear ratios, back lash, and encoder resolution are some of the major contributors [46].…”

Section: Controlsmentioning

confidence: 99%

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Roadmap to Advance Heliostat Technologies for Concentrating Solar-Thermal Power

Zhu¹,

Augustine²,

Mitchell³

et al. 2022

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Heliostat-based concentrating solar-thermal power (CSP) systems can offer immense potential to provide low-cost, dispatchable renewable thermal and electrical energy to help achieve 100% decarbonized energy infrastructure in the United States. Heliostats are a major determinant of both capital cost and performance of state-of-the-art commercial molten salt towers and Generation 3 CSP systems. 1 In 2021, the U.S. Department of Energy (DOE) Solar Energy Technologies Office (SETO) launched the Heliostat Consortium (HelioCon), a five-year initiative to advance heliostat technologies. The HelioCon mission is threefold: (1) establish strategic core testing and modeling capabilities and infrastructure at national labs; (2) support heliostat technology development in relevant industries; and (3) serve as a central repository to integrate industry, academia, and other stakeholders for heliostat technology research, development, validation, and deployment. In this report, HelioCon presents a roadmapping study on advancing heliostat technologies, intended as a central reference for the entire CSP community.1 More information on Gen3 technologies can be found at https://www.energy.gov/eere/solar/generation-3concentrating-solar-power-systems-gen3-csp. vii This report is available at no cost from the National Renewable Energy Laboratory (NREL) at www.nrel.gov/publications. Metrology and StandardsAppropriate measurement techniques and industry standards are fundamental for product design, prototyping, engineering, and improvement. Gaps in metrology:Opto-mechanical metrology (mirror slope error, mirror facet canting error, and heliostat tracking error) is complex, error-prone, and requires high optical precision, necessitating rigorous validation of different technologies using the same measurement parameter(s). Current metrology gaps include:• Lack of at least two viable metrology techniques for a given measurement parameter (such as heliostat tracking error, available for the global CSP industry)• Insufficient or missing validation of any viable metrology technique against a different, trusted metrology technique or ground-truth article. Gaps in standards:Gaps in community-wide standards for site characterization and heliostat design, testing, field design, and field acceptance test protocols result in significant barriers for new developers, extended design cycles, lower investor confidence, and more complicated arbitration between project parties. Gaps include:• Heliostat terminology • Heliostat design guidelines • Heliostat solar field design/simulation guidelines • Heliostat test guidelines • Heliostat solar field acceptance test guidelines • Site characterization guidelines (e.g., wind, topography, soiling characteristics). Recommended pathway forward: Addressing these gaps requires continuing development of new metrology tools and round-robin tests of existing/to-be-developed tools. More importantly, ix This report is available at no cost from the National Renewable Energy Laboratory (NREL) at www.nrel.gov/publications.o...

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Transient Evaluation of Wind‐Induced Vibration Response of Heliostat Under Downburst

Xing

et al. 2023

Energy Tech

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As the region with the highest amount of solar radiation, Qinghai–Tibet Plateau has the highest frequency of thunderstorms in China. Downburst generated in thunderstorm can cause high‐intensive wind near the ground, which is a critical threat to heliostats. Herein, the impact of the wind loads on the heliostat response under downburst is investigated using a proven finite‐element model and the influence is also compared with that under atmospheric boundary layer (ABL) wind. The results demonstrate that the downburst development process, the movement of the storm center, and the heliostat's elevation angle are highly associated with the wind‐induced response characteristics of the heliostat under downburst. The maximum displacement and stress of the heliostat with different elevation angles under the downburst are significantly larger than those under ABL wind. Additionally, when the elevation angle of the heliostat is 30°, the maximum value of the mirror's first principal stress under downburst is 1.88 times greater than it is under ABL wind. Therefore, the impact of wind‐induced vibration caused by downburst is necessarily considered on the safety of heliostat in Qinghai‐Tibet Plateau with abundant solar energy resources and high incidence of downbursts.

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Dynamic photogrammetry applied to a real scale heliostat: Insights into the wind-induced behavior and effects on the optical performance

Cited by 13 publications

References 11 publications

Full-scale investigation of heliostat aerodynamics through wind and pressure measurements at a pentagonal heliostat

Full-scale investigation of heliostat aerodynamics through wind and pressure measurements at a pentagonal heliostat

Roadmap to Advance Heliostat Technologies for Concentrating Solar-Thermal Power

Transient Evaluation of Wind‐Induced Vibration Response of Heliostat Under Downburst

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