- 标题
- 摘要
- 关键词
- 实验方案
- 产品
-
A Review of Conventional and Innovative- Sustainable Methods for Cleaning Reflectors in Concentrating Solar Power Plants
摘要： The severe soiling of re?ectors deployed in arid and semi arid locations decreases their re?ectance 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 re?ectance, the cleaning vehicles of CSP plants must adapt to the constraints of each technology and to the layout of re?ectors in the solar ?eld. 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 re?ectors surface, while other methods, known as preventive methods, focus on reducing the soiling by modifying the re?ectors surface and incorporating self cleaning features using special coatings. Since the CSP plants operators aim to achieve the highest pro?t by minimizing the cost of cleaning while maintaining a high re?ectance, 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.
关键词： CSP re?ectors,dust removal,sustainable cleaning,mirror washing,soiling
更新于2025-09-23 15:23:52
-
Application of Titanium Dioxide Self-Cleaning Coatings on Photovoltaic Modules for Soiling Related Losses Reduction
摘要： Several studies have assessed the influence of soiling deposition on Photovoltaic (PV) modules front-cover with regards to performance losses over time. In fact, soiling phenomena in PV systems are ascribed as responsible for medium and long-term yield reduction up to 16% over the first-year of outdoor exposure. Provided that PV technology is a low yield energy production source, maintaining module initial power output declared values is of the outmost importance to ensure that the return time of investment matches project calculations. The scope of this work was a detailed investigation on self-cleaning coating application as a viable retrofit option on already installed modules, or on newly built PV systems, to avoid soiling build-up on front-covers and guarantee threshold performance level in time. The aim is to provide system designers with a consistent alternative to manual cleaning, without losing effectiveness in terms of yield maintenance. The use of self-cleaning coating instead of acting on panels on a regular basis is more convenient in terms of operation and cost. These issues were analyzed through a set of experiments performed both on commercial size modules and laboratory assembled samples. Results prove product compatibility with PV components and its effectiveness in preventing soiling and dust deposition. Outcomes are presented in terms of maximum power output (Pmax) variation according to measurements performed in Standard Test Conditions (STC) at different time steps. In addition, a parallel comparison with uncoated modules exposed to the same outdoor conditions is also proposed to allow for Pmax variation monitoring performed on a reference sample.
关键词： Titanium Dioxide,PV Maintenance,Soiling,Yield Losses,Self-Cleaning
更新于2025-09-23 15:23:52
-
[IEEE 2018 IEEE 7th World Conference on Photovoltaic Energy Conversion (WCPEC) (A Joint Conference of 45th IEEE PVSC, 28th PVSEC & 34th EU PVSEC) - Waikoloa Village, HI, USA (2018.6.10-2018.6.15)] 2018 IEEE 7th World Conference on Photovoltaic Energy Conversion (WCPEC) (A Joint Conference of 45th IEEE PVSC, 28th PVSEC & 34th EU PVSEC) - Effects of Solar-Glass Coatings on the Adhesion Forces Related to Soiling
摘要： We report on the impact that different coatings on solar glass have on the adhesion forces with SiO2 spheres, which are used to emulate real dust particles. We measured the forces in an atomic force microscope, using force versus distance measurements, and performed the investigation at different values of relative humidity, from 15% to 80%. We will show that, in general, bare solar glass has the largest adhesive forces, with a strong influence of RH. In contrast, some coatings result in much lower adhesion forces and little influence of humidity, which suggests that these coatings may help reduce soiling, and have an impact on soiling associated with dew formation and some cementation processes.
关键词： coatings,adhesion forces,Soiling
更新于2025-09-23 15:23:52
-
[IEEE 2019 7th International Renewable and Sustainable Energy Conference (IRSEC) - Agadir, Morocco (2019.11.27-2019.11.30)] 2019 7th International Renewable and Sustainable Energy Conference (IRSEC) - Photovoltaic Dust Soiling Statistical Representation in Doha, Qatar
摘要： Qatar’s and the Gulf region’s photovoltaic (PV) energy potential is very high. Still, there are tradeoffs under such tropical arid climate, particularly regarding dust soiling losses during the long dry season. In-field performance analyses of PVs under varying soiling states enable the quantification of dust soiling losses. Such estimate of the soiling losses is done a posteriori, using temperature-corrected performance ratios. In the current paper, we study how exceptional events such as sandstorms and rainfalls are identified using statistical analyses of the soiling losses rates. The aim is to generate sets of synthetic years describing the regular dust soiling rates, as well as the exceptionally observed meteorological events. The proposed sets of yearlong synthetic soiling conditions have average statistical representativeness identical to our ongoing in-field experimental measurements. This especially allows economic assessments such as the optimization of dust cleaning scenarios of PV projects.
关键词： Photovoltaics dust soiling,Sandstorms,Statistics,Soiling loss rates,Rainfalls
更新于2025-09-23 15:21:01
-
Application of A Computer Vision Method for Soiling Recognition in Photovoltaic Modules for Autonomous Cleaning Robots
摘要： It is well known that this soiling can reduce the generation efficiency in PV system. In some case according to the literature of loss of energy production in photovoltaic systems can reach up to 50%. In the industry there are various types of cleaning robots, they can substitute the human action, reducing cleaning cost, be used in places where access is difficult, and increasing significantly the gain of the systems. In this paper we present an application of computer vision method for soiling recognition in photovoltaic modules for autonomous cleaning robots. Our method extends classic CV algorithm such Region Growing and the Hough. Additionally, we adopt a pre-processing technique based on Top Hat and Edge detection filters. We have performed a set of experiments to test and validate this method. The article concludes that the developed method can bring more intelligence to photovoltaic cleaning robots.
关键词： Solar Panel,Computer Vision,Soiling Identification,Cartesian Robots,Autonomous Robots
更新于2025-09-23 15:21:01
-
Selection of optimal wavelengths for optical soiling modelling and detection in photovoltaic modules
摘要： Soiling impacts the photovoltaic (PV) module performance by reducing the amount of light reaching the photovoltaic cells and by changing their external spectral response. Currently, the soiling monitoring market is moving toward optical sensors that measure transmittance or reflectance, rather than directly measuring the impact of soiling on the performance of photovoltaic modules. These sensors, which use a single optical measurement, are not able to correct the soiling losses that depend on the solar irradiance spectra and on the spectral response of the monitored PV material. This work investigates methods that can improve the optical detection of soiling by extracting the full soiling spectrum profiles using only two or three monochromatic measurements. Spectral transmittance data, measured with a spectrophotometer and collected during a 46-week experimental soiling study carried out in Ja?en, Spain, was analysed in this work. The use of a spectral profile for the hemispherical transmittance of soiled PV glass is found to significantly improve the soiling detection, returning the lowest errors independently of the PV materials and irradiance conditions. In addition, this work shows that it is also possible to select the measurement wavelengths to minimize the soiling loss detection error depending on the monitored PV semiconductor material (silicon, CdTe, a-Si, CIGS and a representative perovskite). The approaches discussed in this work are also found to be more robust to potential measurement errors compared to single wavelength measurement techniques.
关键词： Soiling,Dust,Optical modelling,Photovoltaic,Spectral losses,Reliability
更新于2025-09-23 15:21:01
-
[IEEE 2019 IEEE 46th Photovoltaic Specialists Conference (PVSC) - Chicago, IL, USA (2019.6.16-2019.6.21)] 2019 IEEE 46th Photovoltaic Specialists Conference (PVSC) - Effect of Surface Charge on the Efficiency of Electrodynamic Dust Shield Prototypes
摘要： In this study, two standalone weather-resistant EDS prototypes were tested in the laboratory to investigate the effect of surface charge on dust removal efficiency. Dust was deposited using a sieve deposition method, and a micro-photomicrography method was used to quantify the dust removal efficiency of the prototypes at various locations on the EDS surface, after a single activation of the EDS, also known as the single-operation mode. Both “dry clean” and “wet clean” were used to prepare the EDS surface prior to each experimental run. The method of cleaning prior to the experiment affected the dust removal efficiency, apparently because the different cleaning actions led to different conditions of surface charge. Dry clean resulted EDS efficiency than was only 1/3 that of wet clean. Meanwhile, dry clean left more than twice as much negative charge on the EDS surface as wet clean, measured at 6 min after the cleaning action. This laboratory study shows the effect of surface charge on EDS efficiency, and it can be used to explain the location dependence of dust removal efficiency observed in the field study. Further research is needed to better understand the role of surface charge in the performance of EDS and potentially improve the technology.
关键词： mitigation,soiling loss,electrodynamic dust shield,field test
更新于2025-09-23 15:21:01
-
AIP Conference Proceedings [Author(s) SolarPACES 2017: International Conference on Concentrating Solar Power and Chemical Energy Systems - Santiago, Chile (26–29 September 2017)] - Model-based soiling estimation in parabolic solar concentrators
摘要： Soiling represents one of the most important factors, influencing the operation of solar concentrator fields. The cleaning cost represents an important percentage of the total maintenance cost, for this type of installations. The estimation of soiling rates can be used to improve significantly the performance of the system, by devising cost effective cleaning schedules. In this work, a model-based adaptive observer is proposed to estimate soiling rates, using available information in solar collector fields. In addition, an index based on daily averaged measurements, of the heat gain and radiance, is proposed. Simulation results illustrate the main characteristic of each algorithm and their good performance under different operating conditions. Comments are also provided, on how these encouraging results can be extended to deal with more complex scenarios.
关键词： cleaning schedules,parabolic solar concentrators,adaptive observer,solar collector fields,soiling estimation
更新于2025-09-23 15:21:01
-
Effects of dust, soiling, aging, and weather conditions on photovoltaic system performances in a Saharan environmenta??Case study in Algeria
摘要： Solar photovoltaic (PV) power represents one of the most promising future sources of energy in the world. Considered the cleanest form of energy, extensive research is being undertaken to widen its use. Notably, mega projects are being considered for installation in the Middle East and North Africa (MENA) region because of its high solar potential, with hopes of eventually feeding Europe from the PV electricity generated in this region and transported through high voltage direct current (DC) lines. However, current implementation of PV systems has shown that their reliability and efficiency depend upon surrounding environmental factors, such as the ambient temperature, wind, and rainfall, as well as soiling, pollution, and aging. The aim of this study was to investigate, through experimental tests, the effects of such factors on the power output of a grid connected PV station. The results showed that the output power and efficiency are deeply affected by various environmental factors, which are weather dependent. These findings may help us develop appropriate solutions to overcome these drawbacks.
关键词： Soiling,Dust,Power losses,Aging,Grid connected PV
更新于2025-09-23 15:19:57
-
Reduction of Soiling on Photovoltaic Modules by a Tracker System with Downward-Facing Standby State
摘要： The radiation received by solar cells within photovoltaic modules is lower than that arriving at the module surface. One of the causes of this energy loss is soiling of the module surface. Therefore, the influence of dust adhesion on photovoltaic modules must be studied. In this study, we prepared two tracker systems: a new system and a typical system. During the night, the former can switch to a downward-facing standby state, while the latter assumes an upward-facing standby state. The soiling on the polymethylmethacrylate and glass set on the tracker systems with both standby states was evaluated for 20 months in Miyazaki, Japan. By adopting the tracker system with the downward-facing standby state, a direct transmittance that was more-than-5% higher than before was consistently obtained at 500 nm in both cases with polymethylmethacrylate and glass.
关键词： photovoltaic modules,soiling,tracker system,transmittance,downward-facing standby state
更新于2025-09-23 15:19:57