Solar Energy最新文献

{"title":"An Intra-Hour photovoltaic power generation prediction method for flexible building energy systems and its application in operation scheduling strategy","authors":"Yongyi Su ,&nbsp;Weirong Zhang ,&nbsp;Gaofeng Deng ,&nbsp;Zhichao Wang","doi":"10.1016/j.solener.2024.113031","DOIUrl":"10.1016/j.solener.2024.113031","url":null,"abstract":"<div><div>Building flexible energy systems (BFES) can be enhanced by introducing storage batteries. Providing timely scheduling strategies for flexible resources can improve the system’s energy utilization. BFES’s scheduling strategies are often adjusted based on Intra-hour photovoltaic(PV) output. Intra-hour PV power generation can be predicted by analyzing cloud imagery data; however, this method does not meet the economic requirements of BFES due to its cost and instrumentation. Therefore, this study proposes a low-cost method for intra-hour PV power generation prediction (IHP) for BFES and explores the impact of integrating this approach into BFES on the rate of renewable energy consumption. This method combined low-quality sky images captured using fisheye cameras installed above buildings with historical electricity generation data and employed convolutional neural networks. The feasibility of the IHP method and the advantages of incorporating it into BFES were verified by applying it to a building equipped with PV devices in Changping, Beijing. The performance of the proposed model algorithm was compared with those of existing models. The proposed method achieved average prediction accuracy improvements of 25.1 and 12.5 % compared with existing models under sunny and cloudy conditions, respectively. Under clear conditions, the model could predict the PV power generation within the next 25 min, whereas under cloudy conditions, the model could predict the power generation within 10 min. In addition, integrating IHP into the scheduling strategy of BFES can improve the renewable energy consumption rate by 44.4 % on the original basis.</div></div>","PeriodicalId":428,"journal":{"name":"Solar Energy","volume":"284 ","pages":"Article 113031"},"PeriodicalIF":6.0,"publicationDate":"2024-10-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142560543","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"A comparative experimental study on the hydrodynamic performance of two floating solar structures with a breakwater in waves","authors":"Yifeng Yang ,&nbsp;Chenhao Mi ,&nbsp;Binjian Ou ,&nbsp;Anson Wong ,&nbsp;John Gordon Duffy ,&nbsp;Tim Wood ,&nbsp;IKAP Utama ,&nbsp;Wenchuang Chen ,&nbsp;Luofeng Huang","doi":"10.1016/j.solener.2024.113029","DOIUrl":"10.1016/j.solener.2024.113029","url":null,"abstract":"<div><div>Floating Photovoltaic (FPV) is considered as a highly promising clean energy solution. In recent years, FPV has been widely deployed in calm water around the world. However, to find available space for further expansion, FPV needs to be deployed in seas whilst the oceanic waves significantly influence the structural stability and energy performance. On one hand, wave loads may cause structural fatigue and damage. On the other hand, wave-induced rotations of a floating solar panel will vary its tilt angle to the sunlight and thus affect the power output. To explore the new research field of ocean-based FPV, this work first designed a novel catamaran FPV floater with a four-point mooring system. Comparative experiments were then conducted in a wave tank to compare its seakeeping ability with a conventional flat-plate floater. Besides, a breakwater structure was further introduced to enhance the stability of these two types of floaters. Detailed data on floater motions and mooring line forces were collected under monochromatic wave conditions. Extensive analysis was performed to evaluate the wave-mitigating performance of the breakwater, as well as the nonlinearity in the motion and force time histories. Overall, the work provides valuable experimental data and novel insights into the design of FPV floaters and breakwater protection, supporting long-term sustainability of FPV on the ocean.</div></div>","PeriodicalId":428,"journal":{"name":"Solar Energy","volume":"284 ","pages":"Article 113029"},"PeriodicalIF":6.0,"publicationDate":"2024-10-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142560544","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Generative heliostat field layout optimization and application based on an improved Harris Hawk Optimization algorithm","authors":"Xiang-Yu Yang,&nbsp;Bo Gao,&nbsp;Tao Huang,&nbsp;Kai Mao","doi":"10.1016/j.solener.2024.113005","DOIUrl":"10.1016/j.solener.2024.113005","url":null,"abstract":"<div><div>This study proposes a pattern-free layout method for continuous generation and optimization of heliostat positions based on optical efficiency. Using annual weighted cosine efficiency as the objective function, the initial layout is generated through a continuous search from the optimal point of the entire field. This is followed by a secondary optimization and selection of all heliostats based on annual weighted optical efficiency. Points with efficiency above the threshold are retained, while low-efficiency points are discarded and re-entered into the search optimization until all eligible heliostat positions are identified, ultimately resulting in a highly efficient heliostat field. The efficiency improvement from the generative pattern-free layout optimization is primarily attributed to the initial search using annual weighted cosine efficiency, which enhances the annual weighted cosine efficiency of the field, and the secondary screening optimization, which improves shading and blocking efficiency. Compared to the original PS10 heliostat field, the annual weighted efficiency increased by 1.77%. Finally, two clustering-based pattern-free layout methods are proposed. The total distance from all points within a K-means cluster to the reference center is 58,238.1974 m, a reduction of 71.18% compared to the untreated original heliostat field. The method based on the Gaussian Mixture Model reduces the distance to the reference center by 66.90%. Classification based on optical efficiency reflects the overall distribution structure of the heliostat field’s optical efficiency, reducing the layout difficulty of pattern-free heliostat fields and providing feasibility for transforming theoretical research into practical engineering applications.</div></div>","PeriodicalId":428,"journal":{"name":"Solar Energy","volume":"284 ","pages":"Article 113005"},"PeriodicalIF":6.0,"publicationDate":"2024-10-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142560545","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Distribution and optimization of solar radiation in a solar greenhouse under the influence of wall shading","authors":"Lianhua Deng,&nbsp;Angui Li,&nbsp;Jigang Che","doi":"10.1016/j.solener.2024.113034","DOIUrl":"10.1016/j.solener.2024.113034","url":null,"abstract":"<div><div>In this study, an indoor solar radiation calculation model was established to investigate the horizontal beam and diffuse radiation distributions in a solar greenhouse and their optimization under the influence of wall shading. According to the model calculation results, both the indoor horizontal beam and diffuse radiation were influenced by greenhouse wall shading. The closer the location was to the corner, the lower the received global solar radiation on a horizontal surface. From 08:00 to 16:00 in winter, the position of the solar energy maximum on the greenhouse ground surface gradually moved from southwest to southeast. Then, the concept of the solar radiation utilization efficiency was proposed to explain the indoor horizontal solar radiation distribution differences between the span and length directions. Finally, the horizontal solar radiation variation was studied via dimensionless analysis of greenhouse building parameters. A sloped soil surface was proposed to improve global solar radiation received by the soil surface. On the basis of the dimensionless analysis results, when the length-height ratio was less than 4, ranged from 4 to 10, or greater than 10, there was an obvious shade effect, a weak shade effect, or a negligible shade effect, respectively. At soil slopes of 2.5°, 5°, 7.5°, and 10°, the hourly mean value of the total solar radiation on the soil surface from 08:00 to 16:00 increased by 6 %, 11 %, 15 %, and 20 %, respectively, compared with the original value.</div></div>","PeriodicalId":428,"journal":{"name":"Solar Energy","volume":"284 ","pages":"Article 113034"},"PeriodicalIF":6.0,"publicationDate":"2024-10-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142560542","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Performance optimization of pulsating heat pipe integrated compound parabolic solar collector using hybrid Red Fox optimizer based DNN (DNN-Rdfx)","authors":"P. Vijayakumar ,&nbsp;A. Gokul Karthik ,&nbsp;R. Vijay ,&nbsp;G. Kumaresan","doi":"10.1016/j.solener.2024.113038","DOIUrl":"10.1016/j.solener.2024.113038","url":null,"abstract":"<div><div>Non-renewable energy usage has gradually increased over the past few decades, polluting the atmosphere. In the investigation, increasing the thermal performance of pulsating heat pipe-integrated compound parabolic solar collectors using hybrid Red Fox optimizer-based DNN. The heat transfer fluid varies the filling ratio, and nanoparticles add to the concentration level. The working fluids are titanium dioxide (TiO₂) and single-wall carbon nanotubes (SWCNT), and the base fluid is deionized water. The filling ratio varies between 40, 50, and 60 % in pulsating heat pipe (PHP) system validation. Thermal resistance, thermal efficiency, and temperature are the experimental validation criteria for evaluating thermal performance. The Nano fluid combination of DIW + 100 ppm SWCNT + 100 ppm TiO₂ significantly outperforms other working fluid combinations. Temperature and thermal efficiency increase by adding nanoparticles to the heat transfer fluid and reducing the thermal resistance. During experimentation with a 60 % filling ratio, the maximum respective temperature, thermal efficiency, and thermal resistivity of 68.167 °C, 58.7 %, and 0.627 °C/W are observed at around 01:00p.m. The predicted and optimized filling ratio from DNN-RdFx is also nearly 60 %. For this optimum filling ratio, the algorithm predicted optimum thermal resistance, thermal efficiency, and temperature are 0.588 °C/W, 62.48 %, and 69.35 °C, respectively, which is predicted to be achieved around 01.18p.m. The confirmatory test readings around this time period got closer to the optimum results with less than 4 % error. The test result indicates the nanoparticles are increasing the thermal performance of the PHP.</div></div>","PeriodicalId":428,"journal":{"name":"Solar Energy","volume":"283 ","pages":"Article 113038"},"PeriodicalIF":6.0,"publicationDate":"2024-10-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142553755","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Dynamic model and compensation circuit for solar array characteristics","authors":"Kentaro Yokota,&nbsp;Hiroyuki Toyota,&nbsp;Shusaku Kanaya,&nbsp;Yu Miyazawa","doi":"10.1016/j.solener.2024.113022","DOIUrl":"10.1016/j.solener.2024.113022","url":null,"abstract":"<div><div>Voltage control in spacecraft power systems relies on switching converters to regulate solar panel power. Traditional power controller design neglects the dynamic characteristics of solar arrays, impacting robustness. Solar Array Simulators (SASs) mimic static characteristics but differ dynamically. This paper proposes an equivalent circuit to simulate dynamic characteristics, enhancing the design reliability of power control systems and a compensation circuit for SASs to improve verification accuracy. Test results comparing solar arrays and SAS frequency characteristics are presented, followed by the proposed circuit’s design and validation using experiments and simulations. Results confirm the effectiveness of the proposed approach in capturing dynamic characteristics, thereby enhancing the reliability of both power control system design and SAS verification.</div></div>","PeriodicalId":428,"journal":{"name":"Solar Energy","volume":"283 ","pages":"Article 113022"},"PeriodicalIF":6.0,"publicationDate":"2024-10-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142553751","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Application of Kalman filter for post-processing WRF-Solar forecasts over Metro Manila, Philippines","authors":"Shane Marie Visaga ,&nbsp;Patric John Pascua ,&nbsp;Leia Pauline Tonga ,&nbsp;Lyndon Mark Olaguera ,&nbsp;Faye Abigail Cruz ,&nbsp;Rafael Alvarenga ,&nbsp;Anthony Bucholtz ,&nbsp;Angela Monina Magnaye ,&nbsp;James Bernard Simpas ,&nbsp;Elizabeth Reid ,&nbsp;Sherdon Niño Uy ,&nbsp;Jose Ramon Villarin","doi":"10.1016/j.solener.2024.113050","DOIUrl":"10.1016/j.solener.2024.113050","url":null,"abstract":"<div><div>Day-ahead forecasts of global horizontal irradiance (GHI) from WRF-Solar were evaluated against GHI observations from a pyranometer deployed at Manila Observatory (MO; 14.64°N, 121.08°E), Metro Manila, Philippines for the January to March (JFM) and June to August (JJA) seasons in 2020. A clear sky detection method using the pyranometer GHI measurements is employed to enable forecast validation not just for overall performance but also for cloudy and clear sky periods separately. To potentially improve GHI forecasts, the WRF-Solar GHI values were postprocessed using a Kalman filter (KF) tested for different training days (i.e., from 3 to 42 days) to determine the optimal number of training days that minimize the RMSE. KF post-processing, with the shortest number of training periods (3 days), already provides an MBE (RMSE) reduction of 70 to 94 % (8 to 12 %). The optimal training period (14 for JJA; 42 for JFM) for filtered WRF-Solar GHI forecasts leads to an MBE (RMSE) reduction of at least 64 % (17 %) during cloudy periods. However, KF underestimates GHI values for clear sky periods because of reducing the bias of the dominantly cloudy periods over the site. Results from the study, the first of its kind to assess performance of WRF-Solar and KF over the Philippines, will serve as a basis for a computationally efficient alternative to more expensive higher resolution and multiple ensemble member solar forecasts. Future work intends to focus on applying this method over different topographies in the Philippines, given the availability of irradiance data.</div></div>","PeriodicalId":428,"journal":{"name":"Solar Energy","volume":"283 ","pages":"Article 113050"},"PeriodicalIF":6.0,"publicationDate":"2024-10-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142553752","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"An extensive study of the impact of graphene passivation on HTLs (PTAA and NiO) in MAPBI3 and Cs3Bi2I9-based inverted perovskite solar cells for thermal stability in SCAPS 1D framework","authors":"Abdullahi Usman,&nbsp;Thiti Bovornratanaraks","doi":"10.1016/j.solener.2024.113043","DOIUrl":"10.1016/j.solener.2024.113043","url":null,"abstract":"<div><div>An investigation of the modification of transport layers of inverted perovskite solar cells has been extensively studied as an interface layer, using various techniques to minimize recombination and improve hole and electron extractions, which is critical as it affects the cell’s performance. This research is aimed to passivate in the HTL/absorber interface by inserting graphene as a hole extraction layer to minimize the phase transition changes caused by vanadium dioxide (VO₂) interface from the experimental finding at low and high temperature resulting in unstable performance. The device is modeled and simulated using a solar cell capacitance simulator (SCAPS) based on the input parameters from the literature. The research objectives are to examine the impact of graphene in eight (8) configurations using two-hole transport layer (HTL) layers of poly[bis(4-phenyl) (2,4,6-trimethylphenyl) amine] (PTAA) and nickel oxide (NiO) in methylammonium lead iodide (MAPbI₃) and cesium bismuth halide (Cs₃Bi₂I₉) devices from existing literature and a single bilayer electron transport layer (ETL) of PCBM/BCP. The device is further optimized where the impact of absorber thickness on recombination was explored, absorber doping densities, interface defects, operating temperatures, and series/shunt resistances within the ranges of 0.1––1 μm, 10¹¹-10¹⁸ cm⁻³, 10¹¹-1020 cm⁻³, 25 °C- 85 °C, default (0)-10 Ω-cm², and 500–5000 Ω-cm², respectively. Devices with graphene passivation demonstrated thermal stability at 85 °C compared to those of 25 °C, with power conversion efficiency (PCE) improvements from 10.43 to 12.71 % and 10.07 to 16.30 % for PTAA and NiO in MAPbI₃-based devices, respectively. For Cs₃Bi₂I₉-based devices, PCE values increased from 10.910 to 19.426 % and 7.21 to 13.930 % for the PTAA and NiO HTLs, respectively. These findings explore the potentials of graphene as the interface layer to replace VO₂ for charge carrier transport in an inverted p-i-n structures.</div></div>","PeriodicalId":428,"journal":{"name":"Solar Energy","volume":"284 ","pages":"Article 113043"},"PeriodicalIF":6.0,"publicationDate":"2024-10-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142553916","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Ultrathin perovskite solar cell based on Gires-Tournois resonator configuration with 27% theoretical efficiency","authors":"Wei Dou ,&nbsp;Zongkun Zhang ,&nbsp;Ning Dai","doi":"10.1016/j.solener.2024.112997","DOIUrl":"10.1016/j.solener.2024.112997","url":null,"abstract":"<div><div>Ultrathin photovoltaic devices hold significant potential for the efficient conversion of solar energy to electricity, offering the advantages of reduced material consumption and deposition time. The key challenge is to achieve high light absorption in ultra-thin layers while minimizing photocurrent losses. In this study, we introduce a strategy centered on super absorption in planar active layers. We have engineered an ultrathin perovskite solar cell featuring a 45-nm-thick absorption layer that exhibits an average absorptivity of 85 % within the visible light and a theoretical efficiency up to ∼ 27 % under certain conditions. This design employs a straightforward silver-backed mirror to enact an effective light-capture technique based on current perovskite solar cell configurations. The observed boost in visible light absorption is attributable to the potent super absorption of the Gires-Tournois resonator configuration. We further analyzed the impact of the built-in electric field on the recombination rate, noting that the enhancement in efficiency is attributed to the effective extraction of charge carriers. The effects of operating temperature and parasitic resistance<!--> <!-->on the performance of the device are evaluated. This assessment helps to understand how these factors influence efficiency and stability, providing insights for optimizing device design in practical settings.</div></div>","PeriodicalId":428,"journal":{"name":"Solar Energy","volume":"284 ","pages":"Article 112997"},"PeriodicalIF":6.0,"publicationDate":"2024-10-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142553917","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Solid-solid PCM-based tree-shaped thermal energy storage system for solar cooling application","authors":"Nicola Bianco ,&nbsp;Andrea Fragnito ,&nbsp;Marcello Iasiello ,&nbsp;Gerardo Maria Mauro","doi":"10.1016/j.solener.2024.113040","DOIUrl":"10.1016/j.solener.2024.113040","url":null,"abstract":"<div><div>This manuscript presents a comprehensive analysis of a solar cooling system, integrating a latent heat thermal energy storage (LHTES) with an absorption chiller, alongside a solar collectors’ field. The LHTES employs solid–solid phase change material (PCM), while the solar collectors belong to the parabolic type. Real-case boundary conditions are derived through the thorough examination of the overall system, encompassing user demands and operational dynamics. In particular, the study evaluates two distinct building scenarios, <em>i.e.,</em> modern, and outdated buildings, considering both existing and new structures, to assess the flexibility and adaptability of the LHTES system to varying cooling demands. The preliminary system analysis gives a set of boundary conditions for the subsequent storage sizing and numerical simulations. Building upon these insights, the manuscript introduces a novel storage design inspired by tree-shaped configurations. This design – numerically simulated through a finite element code – aims to enhance heat spreading throughout the solid–solid PCM and maximize latent heat exploitation, thereby improving overall system efficiency and performance. The sizing of the storage system results in 487.8 kg, and 382.0 kg, for the modern and outdated building, respectively, and storage efficiency reaches a value of 86.15 % and 71.84 % for the charging phase and 97.70 % and 98.21 % for the discharging one, respectively. These results demonstrate the high instantaneous heat rate of the proposed LHTES, leading to high efficiencies in the charging and discharging phases.</div></div>","PeriodicalId":428,"journal":{"name":"Solar Energy","volume":"283 ","pages":"Article 113040"},"PeriodicalIF":6.0,"publicationDate":"2024-10-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142553753","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}