First lay-down heliostat with monolithic mirror-panel, closed loop control, and cleaning system

Pfahl, Andreas; Rheinländer, Jens; Krause, Andreas; Buck, Reiner; Giuliano, Stefano; Hertel, Johannes; Blume, Kristina; Schlichting, Tim; Janotte, Nicole; Ries, Andreas

doi:10.1063/1.5117554

Cited by 8 publications

(5 citation statements)

References 2 publications

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“…Then simple cleaning methods with low water consumption like wiper systems can be applied. To avoid high labor costs automated systems would be required [54].…”

Section: Automated Wiper Lip Cleaning Methodsmentioning

confidence: 99%

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A Review of Conventional and Innovative- Sustainable Methods for Cleaning Reflectors in Concentrating Solar Power Plants

et al. 2018

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The severe soiling of reflectors deployed in arid and semi arid locations decreases their reflectance and drives down the yield of the concentrating solar power (CSP) plants. To alleviate this issue, various sets of methods are available. The operation and maintenance (O&M) staff should opt for sustainable cleaning methods that are safe and environmentally friendly. To restore high reflectance, the cleaning vehicles of CSP plants must adapt to the constraints of each technology and to the layout of reflectors in the solar field. Water based methods are currently the most commonly used in CSP plants but they are not sustainable due to water scarcity and high soiling rates. The recovery and reuse of washing water can compensate for these methods and make them a more reasonable option for mediterranean and desert environments. Dry methods, on the other hand, are gaining more attraction as they are more suitable for desert regions. Some of these methods rely on ultrasonic wave or vibration for detaching the dust bonding from the reflectors surface, while other methods, known as preventive methods, focus on reducing the soiling by modifying the reflectors surface and incorporating self cleaning features using special coatings. Since the CSP plants operators aim to achieve the highest profit by minimizing the cost of cleaning while maintaining a high reflectance, optimizing the cleaning parameters and strategies is of great interest. This work presents the conventional water-based methods that are currently used in CSP plants in addition to sustainable alternative methods for dust removal and soiling prevention. Also, the cleaning effectiveness, the environmental impacts and the economic aspects of each technology are discussed.

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“…Then simple cleaning methods with low water consumption like wiper systems can be applied. To avoid high labor costs automated systems would be required [54].…”

Section: Automated Wiper Lip Cleaning Methodsmentioning

confidence: 99%

“…The wiper lip is fixed on a bearing in the center of the heliostat. For heliostats with approximately round concentrators (with common vertical primary axis) it is 372 possible to realize a wiper cleaning system which is driven by the azimuth drive [54]. The concept is 373 illustrated in Fig.…”

Section: Automated Wiper Lip Cleaning Methodsmentioning

confidence: 99%

A Review of Conventional and Innovative- Sustainable Methods for Cleaning Reflectors in Concentrating Solar Power Plants

et al. 2018

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“…At SolarPACES 2017, a carousel heliostat concept of extraordinary low cost was presented [6]. A first prototype of reduced scale was built and tested [7] (Fig 2 (a)). With additional innovations in detail, the cost can be further significantly reduced (Fig.…”

Section: Heliostat Basic Conceptmentioning

confidence: 99%

“…The unevenness of the ground and possible slippage are compensated by the closed-loop control. The control is based on a camera chip with fish-eye optics placed on the concentrator of each heliostat [6] [7]. The control strategy for a heliostat with two steered wheels (Fig.…”

Section: Closed-loop Controlmentioning

confidence: 99%

Low-cost movable heliostat

Pfahl

Rong

2022

AIP Conference Proceedings

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“…Six years later, at SolarPACES 2017, a heliostat concept was proposed already in close reach to this benchmark [2]. First tests validated the technology concept [3]. Now, with the presented further innovations in certain parts of the design, the cost target seems to be well achievable.…”

Section: Introductionmentioning

confidence: 96%