Solar Energy最新文献_第7页

Experimental study on the performance of the photovoltaic thermal (PVT) connected in series with flat plate solar collector (ST) 与平板太阳能集热器（ST）串联的光伏热（PVT）性能实验研究

IF 6 2区工程技术 Q2 ENERGY & FUELS

Solar Energy

Pub Date : 2024-10-30 DOI: 10.1016/j.solener.2024.113010

Hayder Altharwanee, Francisco Jurado, David Vera

Integrating a photovoltaic thermal system (PVT) with a solar thermal system (ST) allows for the simultaneous achievement of two outcomes: an increase in thermal and electrical efficiency. This work is an experimental study that combines PVT and ST systems together (PVTST) to show how well they work in various weather conditions on four different days in January, February, March, and April. The results showed that the PVTST system raised the output hot water temperature more than the ST system alone. The four testing days recorded temperature differences of approximately (6.15, 6.65, 7.51, and 5.48) °C, respectively. The thermal efficiency of the PVTST system improved by an average of 24.8%, 18.2%, 22.3%, and 19.4%, as compared to the ST system on the four test days, respectively. Similarly, the exergy efficiency showed an average improvement of 7.98%, 7.45%, 7.82%, and 6.97%. The implementation of a PVT system resulted in an average improvement in electrical efficiency of 31.04%, 41.16%, 47.34%, and 11.55% compared to the traditional PV panel during the four selected days, respectively. According to the single room heating simulation results, both the PVTST and ST systems can efficiently heat a single room during the testing days of February, March, and April. However, in January, the ST system had a deficit of approximately 15.9%, whereas the PVTST system had a deficit of around 8.18%. The results indicate that the current PVTST system can meet approximately 61.4%, 79.4%, 77.3%, and 75% of the required hot water temperature on the tested days, respectively.

将光伏热系统 (PVT) 与太阳能热系统 (ST) 相结合，可以同时实现两个结果：提高热效率和电效率。这项工作是一项将光伏热系统和太阳能热系统结合在一起（PVTST）的实验研究，目的是在一月、二月、三月和四月的四个不同的日子里，展示它们在各种天气条件下的工作效果。结果表明，PVTST 系统比 ST 系统更能提高输出热水的温度。四个测试日的温差分别约为（6.15、6.65、7.51 和 5.48）°C。与 ST 系统相比，PVTST 系统在四个测试日的热效率平均分别提高了 24.8%、18.2%、22.3% 和 19.4%。同样，放能效率平均提高了 7.98%、7.45%、7.82% 和 6.97%。与传统光伏板相比，光伏热发电系统在四个选定测试日的平均电效率分别提高了 31.04%、41.16%、47.34% 和 11.55%。根据单间供暖模拟结果，在二月、三月和四月的测试日，PVTST 和 ST 系统都能有效地为单间供暖。然而，在 1 月份，ST 系统的供热量不足率约为 15.9%，而 PVTST 系统的供热量不足率约为 8.18%。结果表明，目前的 PVTST 系统在测试日可分别满足约 61.4%、79.4%、77.3% 和 75% 的热水温度要求。

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引用次数: 0

Thermal performance and economic analysis of saw-tooth and photo-voltaic roof type greenhouse integrated with Earth air heat exchanger 与地球空气热交换器集成的锯齿形和光电屋顶型温室的热性能和经济性分析

IF 6 2区工程技术 Q2 ENERGY & FUELS

Solar Energy

Pub Date : 2024-10-30 DOI: 10.1016/j.solener.2024.113035

Samar Singhal, Ashwini Kumar Yadav, Ravi Prakash

In the present study, comparison of single span saw-tooth and PV-roof type greenhouse assisted with Earth air heat exchanger (EAHE) was carried out for tropical climate based on thermal performance, sunlight availability, tomato crop yield and economical aspects. For natural circulation mode in summer, the average temperature at crop height, light illumination level and relative humidity inside sawtooth type greenhouse was 38.5 °C, 10,000 Lux and 30 % respectively. For PV-roof type greenhouse, the average temperature at crop height, light intensity and relative humidity was 40.2 °C, 8000 Lux and 28 % respectively. The sawtooth and PV-roof type greenhouse with EAHE assisted mist fogging was able to maintain inside temperature 10 °C and 12 °C below the ambient conditions respectively. The maximum coefficient of performance (COP) of EAHE was 2.52 in the afternoon hours. The conducive environment with indoor temperature below 35 °C, relative humidity between 60–70 %, sufficient light intensity levels above the light compensation point and duration of exposure of 8–10 h/day led to 32 % higher tomato yield from the saw-tooth and PV-roof type greenhouse compared to the outdoor conditions. The CFD simulations revealed that the presence of recirculation zones within the greenhouse played crucial role for the uniform temperature distribution. In these recirculation zones air followed a circuitous route to the exit and ventilation rate was governed by the air residence time. The reduced incident solar radiation access to the soil for PV roof type greenhouse had created an environment that allowed better exploitation of the earth-to-ground heat exchanger. The discounted payback period for the saw-tooth type and PV roof type greenhouse with EAHE was 5.4 years and 5.2 years respectively. However, for a large-scale PV-roof greenhouse farm integrated with EAHE system, a more lucrative cost benefit analysis and improved payback period can be achieved.

在本研究中，根据热性能、日照利用率、番茄作物产量和经济性等方面，对热带气候下的单跨锯齿形温室和光伏屋顶温室进行了比较。在夏季自然循环模式下，锯齿形温室内作物高度处的平均温度、光照水平和相对湿度分别为 38.5 °C、10,000 Lux 和 30%。光伏屋顶温室内作物高度处的平均温度、光照强度和相对湿度分别为 40.2 °C、8000 Lux 和 28%。采用 EAHE 辅助雾化技术的锯齿形温室和光伏屋顶型温室的内部温度分别比环境温度低 10 ℃ 和 12 ℃。在下午时段，EAHE 的最大性能系数（COP）为 2.52。室内温度低于 35 °C、相对湿度介于 60-70 % 之间、光照强度高于光补偿点、光照时间为 8-10 小时/天的有利环境使锯齿形和光伏屋顶型温室的番茄产量比室外条件高出 32%。CFD 模拟显示，温室内再循环区的存在对均匀的温度分布起着至关重要的作用。在这些再循环区，空气沿着迂回路线到达出口，通风率由空气停留时间决定。光伏屋顶式温室减少了进入土壤的入射太阳辐射，从而创造了更好地利用地对地热交换器的环境。采用 EAHE 的锯齿形温室和光伏屋顶温室的折现投资回收期分别为 5.4 年和 5.2 年。然而，对于与 EAHE 系统集成的大型光伏屋顶温室农场，可以实现更有利的成本效益分析和更短的投资回收期。

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引用次数: 0

Long-wavelength infrared optical properties of polycrystalline silicon PV modules under clean and soiled conditions for thermography analysis 用于热成像分析的多晶硅光伏组件在清洁和脏污条件下的长波红外光学特性

IF 6 2区工程技术 Q2 ENERGY & FUELS

Solar Energy

Pub Date : 2024-10-30 DOI: 10.1016/j.solener.2024.113028

Flávia Aparecida Ferreira de Oliveira , Robert Gustavo Silva Pereira , Matheus Pereira Porto , Rafael Augusto Magalhães Ferreira

Despite advances in photovoltaic (PV) technologies, polycrystalline silicon (poly-Si) modules remain important in countries that have experienced significant solar growth over the past decade. Thermography is widely used for inspecting PV modules in large-scale solar parks, facilitating the detection of thermal faults. However, limitations such as viewing angle and soiling can affect measurements and decision-making processes. This study investigates the directional emissivity and reflectivity of a poly-Si module under clean and contaminated conditions, using both urban and mineral dirt. A custom experimental setup enabled thermographic inspections using a FLIR SC660 thermal camera across a range of viewing angles (0°to 70°) and temperatures (25 °C to 60 °C). The results demonstrate that emissivity decreases and reflectivity increases with larger viewing angles, with surface temperature exerting minimal impact. Soiling made the surface less reflective, with overall optical trends remaining consistent. These findings contribute to existing literature by addressing the gap in available data on the directional optical properties of poly-Si modules. The results have practical implications for thermal inspections, emphasizing the importance of viewing angles in data interpretation and suggesting adjustments to enhance the rigor of assessments. By providing experimentally derived optical property values, this study also supports the correct application of quantitative thermography in solar plant monitoring.

尽管光伏（PV）技术在不断进步，但多晶硅（Poly-Si）组件在过去十年太阳能大幅增长的国家中仍然非常重要。热成像技术被广泛应用于大型太阳能园区的光伏组件检测，为检测热故障提供了便利。然而，视角和污垢等限制因素会影响测量和决策过程。本研究利用城市污垢和矿物污垢，研究了多晶硅模块在清洁和污染条件下的定向发射率和反射率。通过定制的实验装置，使用 FLIR SC660 红外热像仪在一系列视角（0° 至 70°）和温度（25 °C 至 60°C）范围内进行热成像检测。结果表明，视角越大，发射率越低，反射率越高，而表面温度的影响微乎其微。污垢会降低表面的反射率，但总体光学趋势保持一致。这些发现弥补了现有多晶硅模块定向光学特性数据的不足，为现有文献做出了贡献。这些结果对热检测具有实际意义，强调了观察角度在数据解读中的重要性，并建议进行调整以提高评估的严谨性。通过提供实验得出的光学特性值，本研究还支持在太阳能发电厂监测中正确应用定量热成像技术。

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引用次数: 0

Optimizing solar photovoltaic plant siting in Liangshan Prefecture, China: A policy-integrated, multi-criteria spatial planning framework 中国凉山州太阳能光伏电站选址优化：政策整合、多标准空间规划框架

IF 6 2区工程技术 Q2 ENERGY & FUELS

Solar Energy

Pub Date : 2024-10-28 DOI: 10.1016/j.solener.2024.113012

Linnan Tang , Yu Liu , Yuchun Pan , Yanmin Ren , Lan Yao , Xiaolan Li

The development of solar photovoltaic (PV) energy is essential for China to meet its ’dual-carbon’ goals and shift towards cleaner energy sources. Site selection, a key early step, often neglects land spatial planning constraints and suffers from subjective decision-making ambiguity. This study introduces a novel framework for identifying optimal sites for PV plants within China’s spatial planning. Through two screening stages and three decision-making processes validated in Liangshan Prefecture (LS), where solar and hydro resources are abundant. Criteria such as orography, climate, economy, and hydro-solar complementarity are evaluated to determine PV land suitability. Utilizing the triangular fuzzy number TOPSIS method and GIS technology, the study identifies the desirable areas for PV installations (DAPs). The study highlights that 59.66% of LS’s land is unsuitable for PV, with the remaining areas classified as highly suitable (0.56%), moderately suitable (2.31%), suitable (3.94%), and weakly suitable (33.52%). The DAPs are predominantly located in Huili, Yanyuan, and Huidong counties, while areas like Dechang and Xichang show potential for hydro-solar complementarity. Above all, the methodology aims to improve PV solar power generation efficiency, support local spatial planning and deliver economic and environmental benefits.

发展太阳能光伏发电（PV）对中国实现 "双碳 "目标和向清洁能源转型至关重要。选址作为早期的一个关键步骤，往往会忽视土地空间规划的限制，并受到主观决策模糊性的影响。本研究引入了一个新颖的框架，用于在中国的空间规划范围内确定光伏电站的最佳选址。通过两个筛选阶段和三个决策过程，在太阳能和水能资源丰富的凉山州（LS）进行了验证。对地形、气候、经济和水光互补性等标准进行评估，以确定光伏用地的适宜性。利用三角模糊数 TOPSIS 方法和地理信息系统技术，研究确定了光伏安装的理想区域（DAPs）。研究结果表明，59.66% 的俄勒冈州土地不适合光伏发电，其余地区被划分为高度适宜区（0.56%）、中度适宜区（2.31%）、适宜区（3.94%）和弱适宜区（33.52%）。DAPs主要位于会理、盐源和会东县，而德昌和西昌等地区则显示出水光互补的潜力。最重要的是，该方法旨在提高光伏太阳能发电效率，支持地方空间规划，并带来经济和环境效益。

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引用次数: 0

A systematic review on greenhouse type solar dryers 温室型太阳能干燥器系统综述

IF 6 2区工程技术 Q2 ENERGY & FUELS

Solar Energy

Pub Date : 2024-10-28 DOI: 10.1016/j.solener.2024.113021

Khikmatov Bekhzod Amonovich, Mirzaev Mirfayz Salimovich, Samiev Kamoliddin A’zamovich

Food and Agriculture Organization reports show that farmers today lose 35–45 percent of their crops during harvesting and transportation due to various reasons. One third of the food consumed is thrown away by people. Greenhouse gases released from these wastes make up about 10 % of the total greenhouse gases released into the atmosphere. If serious attention is not paid to this issue, serious problems such as shortage of high-quality food and high prices will cause more concern for humanity. Drying food products using solar dryers is considered as one of the alternative solutions to this problem. In addition, the use of renewable energy increases the possibilities of reducing dependence on energy obtained from fossil fuels. For this reason, there is a lot of research going on in the field of solar dryers today. In this work, scientific research and review articles conducted in the field of greenhouse type solar dryers for 2013–2023 were analyzed. Based on the PRISMA method, 100 of the 1675 articles were selected and included in this review. According to the analysis, it was found that the energy efficiency of greenhouse-type solar dryers is 11–73 %, and the energy efficiency of solar air collectors and biomass furnaces integrated into them is in the range of 45–81 % and 47–87 %. The lifetime of various greenhouse type solar dryers is between 4–35 years, their price is between 220–10659 USD and the payback period is between 0.3–11 years, embodied energy is 136–18302 kWh, and EPBT is in the range of 1.1–3.63 years.

粮食及农业组织的报告显示，由于各种原因，如今农民在收获和运输过程中损失了 35%-45% 的农作物。三分之一的粮食被人们丢弃。这些废弃物释放的温室气体约占排放到大气中的温室气体总量的 10%。如果不重视这一问题，优质食品短缺和价格高昂等严重问题将引起人类更多的关注。使用太阳能烘干机烘干食品被认为是解决这一问题的替代方案之一。此外，可再生能源的使用增加了减少对化石燃料能源依赖的可能性。因此，目前在太阳能干燥器领域正在进行大量研究。在这项工作中，对 2013-2023 年在温室型太阳能干燥器领域开展的科学研究和评论文章进行了分析。根据 PRISMA 方法，从 1675 篇文章中筛选出 100 篇纳入本综述。分析结果表明，温室型太阳能干燥器的能源效率为 11-73%，与之集成的太阳能空气集热器和生物质炉的能源效率分别为 45-81% 和 47-87%。各种温室型太阳能干燥器的使用寿命在 4-35 年之间，价格在 220-10659 美元之间，投资回收期在 0.3-11 年之间，体现能源在 136-18302 千瓦时之间，EPBT 在 1.1-3.63 年之间。

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引用次数: 0

Current status and challenges in silver recovery from End-of-Life crystalline silicon solar photovoltaic panels 从报废晶体硅太阳能光伏电池板中回收银的现状与挑战

IF 6 2区工程技术 Q2 ENERGY & FUELS

Solar Energy

Pub Date : 2024-10-28 DOI: 10.1016/j.solener.2024.113027

Neha Balaji Jadhav, Omkar Gajare, Sarita Zele, Nivedita Gogate, Amrut Joshi

The significant expansion of the solar energy industry over the past few decades has led to the deployment of large number of solar photovoltaic (PV) panels. As these panels approach their end of life (EoL), the cumulative waste is expected to grow exponentially. PV recycling has thus become an appealing prospect and many research studies have been carried out to reclaim valuable materials from waste solar panels. Despite these efforts, the recovery of silver (Ag), a crucial and valuable element in the PV modules, is often overlooked, due to its low concentration. Nonetheless, it is a fast depleting resource with limited natural ore deposits. The aim of this review is to present various methods developed for extracting Ag from EoL solar modules. We have compared various approaches used for Ag recovery from EoL solar panels in terms of their environmental and economic impact. Our evaluation indicates that it is impractical to consider Ag recovery procedure in isolation since it would affect module recycling as a whole. Optimising the complete module recycling operation with appropriate Ag recovery process will provide the necessary economic incentive and promote circular economy.

过去几十年来，太阳能产业的大幅扩张导致大量太阳能光伏（PV）板的部署。随着这些电池板的使用寿命越来越短，预计累积的废弃物将呈指数级增长。因此，光伏回收利用已成为一个具有吸引力的前景，许多研究已开展，以从废弃太阳能电池板中回收有价值的材料。尽管做出了这些努力，但由于银（Ag）的浓度较低，它作为光伏组件中一种重要的有价元素，往往被忽视。然而，由于天然矿藏有限，银是一种快速枯竭的资源。本综述旨在介绍从 EoL 太阳能模块中提取银的各种方法。我们从环境和经济影响的角度比较了用于从 EoL 太阳能电池板中回收 Ag 的各种方法。我们的评估表明，孤立地考虑银回收程序是不切实际的，因为它会影响整个模块的回收。利用适当的 Ag 回收程序优化整个模块回收操作，将提供必要的经济激励，促进循环经济。

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引用次数: 0

Performance investigation of newly developed novel hemispherical solar dryer for sustainable food preservation: Comparative analysis with traditional methods 用于可持续食品保鲜的新开发新型半球形太阳能干燥器的性能研究：与传统方法的比较分析

IF 6 2区工程技术 Q2 ENERGY & FUELS

Solar Energy

Pub Date : 2024-10-28 DOI: 10.1016/j.solener.2024.113036

Yogesh D. Kokate , Prasad R. Baviskar , Sanjeev D. Suryawanshi

To preserve the world’s food resources, drying agricultural products is crucial for prolonging their shelf life. A novel concept of 1.5 m hemispherical solar dryer surmounts the limitations of conventional dryers like long drying time, solar tracking, large space requirement etc. Trials were performed on Thomson grapes to convert into raisins. For the purpose of fair accuracy in comparison, experiments were conducted on hemispherical solar dryer (active and passive mode), traditional cabinet solar dryer as well as open sun drying (OSD) by maintaining the uniform test conditions. An average moisture removal rate of 0.1935096 kg/h was obtained in hemispherical dryer. The hemispherical solar dryer significantly reduced drying time for converging grapes into raisins to 13 days, compared to 18 days in a cabinet solar dryer and 19 days with OSD. The hemispherical dryer, through a gap, creates a greenhouse effect, reaching a 70.1 °C maximum temperature and an average of 60.7 °C at 796 W/m2 average solar energy. The hemispherical dryer attained a drying efficiency of 5.67 %. Six mathematical models were employed for hemispherical and cabinet dryers. Amongst these Two term and Wang & Singh models were found suitable for the experimental data and provided precise prediction of moisture ratio.

为了保护世界粮食资源，干燥农产品对于延长其保质期至关重要。1.5 米半球形太阳能干燥器的新概念克服了传统干燥器的局限性，如干燥时间长、太阳能跟踪、空间要求大等。对汤姆森葡萄进行了试验，以便将其转化为葡萄干。为了进行公平准确的比较，在保持试验条件一致的情况下，对半球形太阳能干燥器（主动和被动模式）、传统柜式太阳能干燥器以及露天阳光干燥（OSD）进行了试验。半球形太阳能干燥器的平均水分去除率为 0.1935096 kg/h。与柜式太阳能干燥器的 18 天和 OSD 的 19 天相比，半球形太阳能干燥器大大缩短了将葡萄转化为葡萄干的干燥时间，仅为 13 天。半球形干燥器通过缝隙产生温室效应，最高温度达到 70.1 °C，在平均 796 瓦/平方米的太阳能条件下，平均温度为 60.7 °C。半球形干燥器的干燥效率为 5.67%。半球形和柜式干燥机采用了六个数学模型。其中，Two term 和 Wang & Singh 模型适用于实验数据，并能精确预测水分比率。

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引用次数: 0

Performance prediction and optimisation of even-lighting agrivoltaic systems with semi-transparent PV module in the tropical region 热带地区采用半透明光伏组件的均匀光照农业光伏系统的性能预测与优化

IF 6 2区工程技术 Q2 ENERGY & FUELS

Solar Energy

Pub Date : 2024-10-28 DOI: 10.1016/j.solener.2024.113013

Santi Apriani , Rizki A. Mangkuto , Adhitya Gandaryus Saputro , Edward C. Chow

Agrivoltaic systems with conventional PV panels may cause a shading effect to the plants, particularly in the tropical region where the sun position around noon is always near the zenith. Agrivoltaic systems that can ensure sufficient and even lighting, such as the semi-transparent PV (STPV) module, are thus promising. However, simulation and optimisation studies in application of such system in the tropics are still rarely found in literature. This study therefore aims to predict and optimise the annual performance of an agrivoltaic system with STPV module, for the case of a tropical location. Modelling and simulation were conducted in Rhinoceros, considering various module heights, tilt angles, and orientations, to predict the photosynthetic photon flux density (PPFD). To determine the optimum PV module configuration, weighting factors were given to the annual average illuminance, uniformity, illuminance reduction due to shading, and energy yield. Monte Carlo simulation was run by assigning random numbers to each weighting factor. The design configuration that occurs optimum the most often was deemed the global optimum solution. Experiments were also carried out with bok choy (Brassica rapa) plants to observe the impact on the plant growth. Based on simulation, the optimum performance is achieved by the STPV module at 3 m high, 20° tilt angle, facing north. Based on experiments, the plant growths under the STPV and under no PV modules are not significantly different. Overall, this study provides a foundation for large-scale application and optimisation of agrivoltaic systems with STPV configuration.

使用传统光伏板的农业光伏系统可能会对植物产生遮光效应，特别是在热带地区，正午时分的太阳位置总是在天顶附近。因此，半透明光伏（STPV）模块等能确保充足、均匀光照的农业光伏系统很有前途。然而，在热带地区应用此类系统的模拟和优化研究在文献中仍然很少见。因此，本研究旨在针对热带地区的情况，预测和优化采用 STPV 模块的农业光伏系统的年度性能。在 Rhinoceros 中进行了建模和模拟，考虑了各种模块高度、倾斜角度和方向，以预测光合光通量密度 (PPFD)。为了确定最佳的光伏组件配置，对年平均照度、均匀度、遮阳导致的照度降低以及能量产出进行了加权。通过为每个权重因子分配随机数，进行蒙特卡罗模拟。出现最优次数最多的设计配置被视为全局最优解。还用大白菜（Brassica rapa）植物进行了实验，以观察其对植物生长的影响。根据模拟，STPV 模块的最佳性能为 3 米高、20° 倾角、朝向北方。根据实验，STPV 和无光伏组件下的植物生长没有明显差异。总之，这项研究为大规模应用和优化 STPV 配置的农业光伏系统奠定了基础。

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引用次数: 0

Design methodology and performance analysis of a novel cooling system for dense array CPV receivers 密集阵列 CPV 接收器新型冷却系统的设计方法和性能分析

IF 6 2区工程技术 Q2 ENERGY & FUELS

Solar Energy

Pub Date : 2024-10-25 DOI: 10.1016/j.solener.2024.113011

Alicia Crespo , Desideri Regany , Jérôme Barrau , Joan Ignasi Rosell

The electrical performance of a dense array concentrating photovoltaics (CPV) receiver is reduced by the increase of average temperature, and by a non-uniform temperature map due to a non-uniform illumination profile. This can be reversed by an effective cooling system that allows the CPV cells to operate at nominal temperatures, as well as by optimal cell control at electrical level. An analysis that considers the interdependence between thermal and electrical behavior is essential for obtaining realistic performance results. Hence, this study presents a methodology for analyzing the performance of a CPV receiver controlled with DC-DC converters which considers the interaction between thermal and electrical behavior. The methodology allows to optimize the design of a novel jet impingement cooling system used in the receiver. Additionally, the efficiency of three different sizes of CPV receivers cooled by two technologies, microchannels and jet impingement, are analyzed. The results show that maximum receiver efficiency did not coincide with the maximum heat extraction coefficient. The study confirmed that larger receiver sizes had lower efficiency due to the mismatch losses and resulted more efficient (0.6 %) using the proposed jet impingement cooling system compared to microchannels.

密集阵列聚光光伏（CPV）接收器的电气性能会因平均温度的升高以及非均匀光照导致的非均匀温度图而降低。如果采用有效的冷却系统，使 CPV 电池在额定温度下工作，并对电池进行电气控制，就能扭转这种情况。要获得逼真的性能结果，就必须对热行为和电行为之间的相互依存关系进行分析。因此，本研究提出了一种方法，用于分析使用直流-直流转换器控制的 CPV 接收器的性能，该方法考虑了热行为和电行为之间的相互作用。通过该方法，可以优化接收器中使用的新型喷射撞击冷却系统的设计。此外，还分析了采用微通道和射流冲击两种技术冷却的三种不同尺寸的 CPV 接收器的效率。结果表明，最大接收器效率与最大热萃取系数并不一致。研究证实，由于错配损失，较大尺寸的接收器效率较低，而与微通道相比，使用建议的喷射撞击冷却系统效率更高（0.6%）。

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引用次数: 0

Optimization and performance assessment of Ag@SiO2 core–shell nanofluids for spectral splitting PV/T system: Theoretical and experiment analysis 用于光谱分光光伏/发电系统的 Ag@SiO2 核壳纳米流体的优化和性能评估：理论与实验分析

IF 6 2区工程技术 Q2 ENERGY & FUELS

Solar Energy

Pub Date : 2024-10-25 DOI: 10.1016/j.solener.2024.113030

Junhan Xu, Binghong Chen, Kunpeng Yuan, Jun Shu, Qiguo Yang

Ag@SiO₂ nanofluid is widely used in spectral splitting PV/T system. Its core–shell structure has great influence on the optical properties. In this work, we focus on the comprehensive analysis and structure optimization of Ag@SiO₂ nanofluid to achieve its optimal spectral performance. DDA method is used to predict the optical properties of Ag@SiO₂ nanofluid and an optimization model based on filter efficiency is proposed. The effect of the SiO₂ shell thickness and Ag core mass concentration is analyzed. It indicates that the spectral performance of Ag@SiO₂ nanofluid can be improved with SiO₂ shell thickness of 15–40 nm and Ag core mass concentration of 81–135 mg/L. To achieve the same theoretical merit function of 1.46, the usage of Ag mass can be reduced by 25/33/44/62 % with SiO₂ coating of 10/20/40/70 nm. The optimal structure to achieve the highest filter efficiency η of 37.8 % is with a shell thickness of 20 nm and a mass concentration of 113.9 mg/L. An indoor PV/T operation testing is conducted to verify the optimization results. The merit function of Ag-based nanofluids increases from 1.58 to 1.598 and a reduction in Ag usage of 17 % is achieved with a SiO₂ coating shell of 17.8 nm. Operation stability is also enhanced with no aggregation observed during the working cycle and 7-day static experiment.

Ag@SiO2 纳米流体被广泛应用于分光光伏发电系统。其核壳结构对光学性能有很大影响。在这项工作中，我们重点对Ag@SiO2纳米流体进行了综合分析和结构优化，以实现其最佳光谱性能。采用DDA方法预测了Ag@SiO2纳米流体的光学特性，并提出了基于滤波效率的优化模型。分析了 SiO2 外壳厚度和 Ag 核质量浓度的影响。结果表明，当 SiO2 外壳厚度为 15-40 nm，Ag 核质量浓度为 81-135 mg/L 时，Ag@SiO2 纳米流体的光谱性能可以得到改善。为了达到相同的理论功函数 1.46，SiO2 涂层厚度为 10/20/40/70 nm 时，Ag 的用量可减少 25/33/44/62%。壳厚度为 20 nm，质量浓度为 113.9 mg/L，是实现最高过滤效率 η 37.8 % 的最佳结构。为验证优化结果，进行了室内 PV/T 运行测试。银基纳米流体的优点函数从 1.58 增加到 1.598，二氧化硅涂层外壳厚度为 17.8 nm 时，银的用量减少了 17%。运行稳定性也得到了提高，在工作周期和 7 天静态实验中均未观察到聚集现象。

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