Solar Energy最新文献

{"title":"Energy, exergy, and economic analysis of a novel solar-assisted ejector subcooling CO2 transcritical refrigeration systemt","authors":"Tailan Yin,&nbsp;Qichao Yang,&nbsp;Jiawei Jiang,&nbsp;Zeye Zheng,&nbsp;Yuanyang Zhao,&nbsp;Guangbin Liu,&nbsp;Liansheng Li","doi":"10.1016/j.solener.2024.113080","DOIUrl":"10.1016/j.solener.2024.113080","url":null,"abstract":"<div><div>To further enhance the performance of transcritical CO₂ refrigeration cycle (base cycle), a solar-assisted ejector subcooling transcritical CO₂ refrigeration cycle (SESRS) is proposed. The base cycle is subcooled utilizing a solar-assisted ejector refrigeration cycle. This research performed energy, exergy, and economic evaluations of SESRS utilizing the eco-friendly refrigerant R152a in the ejector cycle based on the established model. The thermodynamic analysis results demonstrate that SESRS outperform the base cycle. At typical working conditions, the COP_m of the SESRS demonstrates a 22.96 % increase compared to that of the base cycle. Although the total cost of the SESRS is 7.98 %–17.9 % higher than that of the base cycle when subcooling degree is 5 °C, the enhancement of COP_m is larger and is increased by approximately 18.34 %–26.22 %. The impact of subcooling degree and other parameters on system performance are also investigated. Overall, this study confirms the potential of the SESRS system for utilization in the refrigeration and air-conditioning fields. Considering both the system’s performance and economy, further optimized analysis should be done on key operational parameters, such as subcooling degree and discharge pressure.</div></div>","PeriodicalId":428,"journal":{"name":"Solar Energy","volume":"284 ","pages":"Article 113080"},"PeriodicalIF":6.0,"publicationDate":"2024-11-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142654494","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":"Competitive influence of interface effect, scale effect and mixed salt ratio on thermal conductivity of mesoporous complex nitrate","authors":"Shuang Ma ,&nbsp;Chenxuan Yan ,&nbsp;Liqin He ,&nbsp;Qirong Yang ,&nbsp;Zhaoying Li ,&nbsp;Xinsong Wang ,&nbsp;Han Jiang ,&nbsp;Youping Li","doi":"10.1016/j.solener.2024.113075","DOIUrl":"10.1016/j.solener.2024.113075","url":null,"abstract":"<div><div>The rising prominence of energy security and climate change issues necessitates the advancement of sustainable energy development and energy storage technologies. Enhancing the capabilities of mesoporous composite phase change materials (CPCMs) has gained considerable research interest. CPCM’s heat storage and release performance is largely determined by its thermal conductivity. While the existing literature has documented the individual effects of the composition ratio of mixed molten salts, scale effects, and interfacial effects on thermal conductivity, no studies have been found that investigate the competitive interplay among these three factors with respect to their impact on thermal conductivity. This study aims to gain a deeper insight into the thermal conductivity changes of CPCM consisting of mixed molten salts as the phase change material (PCM) and mesoporous skeleton. A combination of molecular dynamics simulations and experimental investigations was employed to explore how interface effects, scale effects, and the proportion of mixed salts contribute to the thermal conductivity of CPCM. The findings indicate that augmented thermal conductivity, resulting from interface effects, supersedes the diminishing effects of interionic interactions. Compared to mixed salt ratios, interface effects primarily result in variations in the thermal conductivity of CPCM. The thermal conductivity of mixed nitrates escalates alongside scale increases. In the 3–4 nm range, the scale effect and mixed nitrate proportions do not notably compete in terms of influence on thermal conductivity, interface effects are more profound than scale effects. In the 4–9.5 nm range, the scale effect is more profound than mixed nitrate ratios. If the skeleton transitions from SiO₂ to Al₂O₃, the impact of the interface effect on thermal conductivity is greater influential than the scale effect. While transitioning the interface from Al₂O₃ to ceramic, the effect of the interface is less than or equal to that of the scale effect on the thermal conductivity.</div></div>","PeriodicalId":428,"journal":{"name":"Solar Energy","volume":"284 ","pages":"Article 113075"},"PeriodicalIF":6.0,"publicationDate":"2024-11-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142593252","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":"Analysis of an ultra-broadband TiN-based metasurface absorber for solar thermophotovoltaic cell in the visible to near infrared region","authors":"Mohammad Ashraful Haque,&nbsp;Abu S.M. Mohsin,&nbsp;Mohammed Belal Hossain Bhuian,&nbsp;Md Mosaddequr Rahman","doi":"10.1016/j.solener.2024.113064","DOIUrl":"10.1016/j.solener.2024.113064","url":null,"abstract":"<div><div>Solar thermophotovoltaic (STPV) represents next-generation technology for solar cells, enabling higher efficiency and better performance through advanced photothermal processes. They can surpass the Shockley–Queisser limit due to their superior photothermal conversion efficiency. The absorber is a crucial component on which the efficiency of the entire system depends. In this article, we have proposed a TiN-based metasurface absorber (MA) which is capable of operating at high temperatures with superior efficiency. We have numerically investigated the structure using the Finite Difference Time Domain (FDTD) method. Our analysis suggests that the MA can absorb more than 90% radiation in the 200–1733.5 nm range and achieves near-perfect absorbance (more than 99.5%) in the 719.7 - 1371 nm range which is suitable for solar cell applications. Moreover, the MA also emits selective radiation and works as a metasurface emitter (ME). It achieves a maximum photothermal efficiency of 80% at 1900 K temperature. The findings of this study opens a new avenue for the development of cost effective, reliable and stable, highly efficient solar thermophotovoltaic cells in the visible to near infrared region.</div></div>","PeriodicalId":428,"journal":{"name":"Solar Energy","volume":"284 ","pages":"Article 113064"},"PeriodicalIF":6.0,"publicationDate":"2024-11-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142593251","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":"Wind loads on heliostat tracker: A LES study on the role of geometrical details and the characteristics of near-ground turbulence","authors":"Weilin Li ,&nbsp;Fa Yang ,&nbsp;Huawei Niu ,&nbsp;Luca Patruno ,&nbsp;Xugang Hua","doi":"10.1016/j.solener.2024.113041","DOIUrl":"10.1016/j.solener.2024.113041","url":null,"abstract":"<div><div>The accurate evaluation of the operational and survival wind loads for ground-mounted heliostat trackers is vital for reducing the total cost during the life cycle of concentrated solar power plants. Current studies rely on reduced scale Wind Tunnel Tests (WTTs), which makes the investigation of the effects of supporting components and near-ground turbulence not trivial. As a result, there is an urgent need to develop complementary techniques to guide wind-resistant designs of commercial heliostats. In this paper, we investigate the performance of Large Eddy Simulations (LES) to systematically study the mean and peak wind loads over heliostats. The effects of elevation and azimuth angles, supports components, turbulence intensity and length scale are investigated. Results show that the proposed LES model accurately reproduces integral force coefficients and the local pressure distributions. Further, an accurate evaluation of the survival wind loads needs to consider the effects of supports components, as they contribute more than 50% to the mean lift and overturning moment in the stow positions. Finally, the effects of turbulence intensity and integral scale are clarified by considering eight different combinations of parameters to characterize the near-ground turbulence. This study provides useful guidelines for design wind loads and lays a solid foundation for LES of heliostat arrays.</div></div>","PeriodicalId":428,"journal":{"name":"Solar Energy","volume":"284 ","pages":"Article 113041"},"PeriodicalIF":6.0,"publicationDate":"2024-11-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142587131","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":"Interfacial evaporation characteristics of three-dimensional Cu-Fe3O4 nanoparticle film","authors":"Maoqing Tang,&nbsp;Cong Qi,&nbsp;Linfei Yue,&nbsp;Zhanpeng Yu","doi":"10.1016/j.solener.2024.113071","DOIUrl":"10.1016/j.solener.2024.113071","url":null,"abstract":"<div><div>In an effort to further enhance the evaporation effect of interfacial evaporation, a super-hydrophilic nanoparticle film was prepared by ultrasonic impregnation in this paper. Then, by improving the structure and configuration design of nanoparticle film, the nanoparticle film was transformed from two-dimensional structure to three-dimensional structure. The effects of three-dimensional structure shape, radiation intensity and three-dimensional structure height on the evaporation capacity of nanoparticle films were studied. It was found that the evaporation rate of the three-dimensional rectangular Cu-Fe₃O₄ nanoparticle film with a rectangular height of 15 mm achieved 1.2 kg/m²/h under one sun radiation intensity. The evaporation efficiency can reach 75.44 %, and the thermal efficiency can reach 111.91 %. The design of the three-dimensional structure enables the nanoparticle film to perform double-sided evaporation. At the same time, under the action of natural air convection, the nanoparticle film evaporation efficiency is greatly improved, which provides a design strategy for the nanoparticle film in the field of solar-driven interface evaporation.</div></div>","PeriodicalId":428,"journal":{"name":"Solar Energy","volume":"284 ","pages":"Article 113071"},"PeriodicalIF":6.0,"publicationDate":"2024-11-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142578008","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":"Effects of dust and rainfall on the relative reflectivity of linear Fresnel reflectors","authors":"Xiaoyan Zhao,&nbsp;Rong Cheng,&nbsp;Yahui Wang,&nbsp;Yiwei Fu,&nbsp;Jialin Guo","doi":"10.1016/j.solener.2024.113065","DOIUrl":"10.1016/j.solener.2024.113065","url":null,"abstract":"<div><div>Dust and rainfall have been key issues affecting outdoor solar concentrating systems. This study aimed to accurately evaluate the specific effects of dust and rainfall on linear Fresnel reflectors in semi-arid regions. Targeted outdoor experiments on dust and rainwater were conducted in Hohhot, Inner Mongolia, from September to December 2023. A predictive model is developed to assess the effect of rainfall on reflectivity under conditions of dust accumulation, based on the physical properties of outdoor-exposed dust. The study reveals that after 60 days of exposure, the reflectivity decreased at a rate of 0.25 % per day due to mirror dust, particularly within the 380–780 nm wavelength range, reaching 21.62 %. The rainfall leads to four distinct conditions, namely pitting, surface corrosion, gully corrosion, and overall corrosion on the dusty mirror. During the gully corrosion and corrosion stages, the reflectivity significantly improved. Rainfall below 0.4 mm barely cleaned mirror dust, whereas rainfall exceeding 26.70 mm provided substantial cleaning but reached a saturation point with additional rainfall. These findings contribute to the development of cost-effective cleaning strategies for similar climatic conditions.</div></div>","PeriodicalId":428,"journal":{"name":"Solar Energy","volume":"284 ","pages":"Article 113065"},"PeriodicalIF":6.0,"publicationDate":"2024-11-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142587130","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":"Evaluating the electronic and structural basis of carbon selenide-based quantum dots as photovoltaic design materials: A DFT and ML analysis","authors":"Afaf M. Kadhum ,&nbsp;Azal S. Waheeb ,&nbsp;Masar A. Awad ,&nbsp;Abrar U. Hassan ,&nbsp;Sajjad H. Sumrra ,&nbsp;Cihat Güleryüz ,&nbsp;Ayesha Mohyuddin ,&nbsp;Sadaf Noreen ,&nbsp;Hussein A.K. Kyhoiesh ,&nbsp;Mohammed T. Alotaibi","doi":"10.1016/j.solener.2024.113068","DOIUrl":"10.1016/j.solener.2024.113068","url":null,"abstract":"<div><div>We present a new study on the design, discovery and space generation of carbon selenide based photovoltaic (PV) materials. By extending acceptors and leveraging density functional theory (DFT) and machine learning (ML) analysis, we discover new QDs with remarkable PV properties. We employ various ML models, to correlate the exciton binding energy (E_b) of 938 relevant compounds from literature with their molecular descriptors of structural features that influence their performance. Our study demonstrates the potential of ML approaches in streamlining the design and discovery of high-efficiency PV materials. Also the RDKit computed molecular descriptors correlates with PV parameters revealed maximum absorption (λ_max) ranges of 509–531 nm, light harvesting efficiency (LHE) above 92 %, Open Circuit Voltage (V_oc) of 0.22–0.45 V, and short Circuit (J_sc) currents of 37.92–42.75 mA/cm². Their Predicted Power Conversion Efficiencies (PCE) using the Scharber method reaches upto 09–13 %. This study can pave the way for molecular descriptor-based design of new PV materials, promising a paradigm shift in the development of high-efficiency solar energy conversion technologies.</div></div>","PeriodicalId":428,"journal":{"name":"Solar Energy","volume":"284 ","pages":"Article 113068"},"PeriodicalIF":6.0,"publicationDate":"2024-11-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142578009","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":"Effects of insert design and optimization on the performance of parabolic trough receivers with inserted absorbers","authors":"Jiangbo Wang ,&nbsp;Liangcai Zeng ,&nbsp;Sheng Yu ,&nbsp;Yuting He","doi":"10.1016/j.solener.2024.113061","DOIUrl":"10.1016/j.solener.2024.113061","url":null,"abstract":"<div><div>To address the non-uniform heat flux density characteristics of parabolic trough solar collectors (PTSCs), an innovative insert (composed of vortex generator, VG) layout scheme is introduced in this study. Under turbulent conditions, an analysis is conducted on the thermal performance of three different placement strategies (uniform distribution, UD, directional distribution-1, DD-1, and directional distribution-2, DD-2), including the calculation of Nusselt numbers, drag coefficients, and thermal enhancement factors. The results indicate that VG can induce paired vortices, and the position, intensity, and quantity of vortices are closely related to the shape of VG. Based on the direction of vortex flow, the flow field is divided into collision area (CA) and pushing area (PA). In the CA, vortices collide with each other, consuming turbulent energy and reducing local heat transfer efficiency. In the PA, the direction of vortice motion is opposite, which can achieve efficient local heat efficiency. In the three VG cases, the DD-2 configuration can induce non-uniformly distributed high-intensity mixed vortices and further achieve the demand for heat transfer enhancement in the area of high heat flux density through the ejection and sweeping movements of these vortices. In all investigations, DD-2 configuration can achieve an improvement in heat transfer rate ranging from 1.5 to 2.12. In terms of heat transfer performance (<span><math><mi>ψ</mi></math></span>), the ψ value of DD-2 is 1.37 at N = 4 and Re = 20,000. Besides, the thermal performance of the tube with insert is analyzed through entropy generation.</div></div>","PeriodicalId":428,"journal":{"name":"Solar Energy","volume":"284 ","pages":"Article 113061"},"PeriodicalIF":6.0,"publicationDate":"2024-11-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142573550","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":"Study on energy and exergy performance of a new hybrid perforated photovoltaic/solar air heater integrated with encapsulated phase change materials: An experimental study","authors":"Hadi Farzan ,&nbsp;Mojtaba Mahmoudi ,&nbsp;Omid Moradnejad ,&nbsp;Forouzesh Rafiei Rezvani","doi":"10.1016/j.solener.2024.113062","DOIUrl":"10.1016/j.solener.2024.113062","url":null,"abstract":"<div><div>The current study conducts energy and exergy analyses on an innovative hybrid perforated photovoltaic/solar air heater (PV/SAH) using passive and active methods to improve thermal and electrical efficiencies. Since increasing PVs’ temperature reduces their electrical efficiency, various techniques have been employed to handle this problem, employing effective cooling strategies. This study uses an experimental approach to analyze two cooling strategies: encapsulated phase change material (PCM) units as a passive method and forced-convection mechanism as an active method. Two scenarios were considered: hybrid PV/SAH with and without encapsulated PCM units at two mass flow rates of 0.05 kg/s and 0.07 kg/s. The results illustrate that the encapsulated PCM reduced the PV and outlet temperatures by 2 °C and 4 °C, and 3 °C and 1.5 °C at the mass flow rates of 0.05 kg/s and 0.07 kg/s, respectively. The lower the outlet temperature, the lower the thermal efficiency. Hence, using the PCM units decreased the thermal efficiency but improved the electrical efficiency. The PCM units caused a reduction in daily overall energy efficiency by 12.41 % and 8.36 % at the mass flow rates of 0.05 kg/s and 0.07 kg/s due to reducing thermal efficiency. Unlike the energy efficiency, the PCM units improved the daily overall exergy efficiency by 6.28 % and 8.71 % at the mass flow rates considered. Hence, using passive and active methods is a robust technique to improve the hybrid systems’ performance.</div></div>","PeriodicalId":428,"journal":{"name":"Solar Energy","volume":"284 ","pages":"Article 113062"},"PeriodicalIF":6.0,"publicationDate":"2024-11-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142573551","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":"Deciphering hysteresis in perovskite solar cells: Insights from device simulations distinguishing shallow traps from mobile ions","authors":"Welmoed Veurman ,&nbsp;Jonas Kern ,&nbsp;Leon Pflüger ,&nbsp;Hannes Wagner-Mohnsen ,&nbsp;Matthias Müller ,&nbsp;Pietro P. Altermatt ,&nbsp;ZhaoYu Lou ,&nbsp;Martin Stolterfoht ,&nbsp;Felix Haase ,&nbsp;Sarah Kajari-Schröder ,&nbsp;Robby Peibst","doi":"10.1016/j.solener.2024.113037","DOIUrl":"10.1016/j.solener.2024.113037","url":null,"abstract":"<div><div>In perovskite solar cells, a hysteresis of the current–voltage curve is often observed and is usually attributed to moving ions. However, our device modelling forecasts that it can also be explained, at least in part, by the occupation behaviour of slow-shallow trap states in the perovskite material. A difference between the ionic and trap interpretation arises in the illumination dependence of the hysteresis. Under the assumption of slow-shallow trap states, our simulations show that a diffusion capacitive effect should be observed at high scanning rates (&gt; 100 V/s) and low light intensities (&lt; 0.01 sun). This effect does not appear when assuming a device model with moving ion vacancies. This offers an opportunity for experimentally distinguishing between the two explanatory models and to quantify the relative contributions to hysteresis from ion vacancies and traps, respectively.</div></div>","PeriodicalId":428,"journal":{"name":"Solar Energy","volume":"284 ","pages":"Article 113037"},"PeriodicalIF":6.0,"publicationDate":"2024-11-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142573549","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}