Renewable Energy最新文献_第8页

Pyrolysis mechanism of cotton stalk catalyzed by bone char in situ: Py-GC/MS and DFT studies 骨炭原位催化棉花秸秆热解机理：Py-GC/MS和DFT研究

IF 9.1 1区工程技术 Q1 ENERGY & FUELS

Renewable Energy

Pub Date : 2026-01-12 DOI: 10.1016/j.renene.2026.125260

Qianqian Qiu , Jianting Lin , Fanrui Meng , Xianchun Li , Shanchen Li , Yichen Tang

This study investigated the effect of bone char on the conversion of cotton stalk pyrolysis tar components through pyrolysis-gas chromatography/mass spectrometry (Py-GC/MS) and density-functional theory calculations. The results revealed that both bone char and bone char ash exhibit catalytic cracking effects on the chemical composition of tar. At 600 °C, cotton stalk pyrolysis tar mainly comprised ketones, phenols, esters, and hydrocarbons, with a low acid content. The addition of bone char enhanced esterification during cotton stalk pyrolysis, which converted gaseous tar into esters and reduced the levels of ketones and alcohols. Additionally, the content of phenolic compounds significantly decreased by 12.72 % and 11.9 %, respectively, and nearly disappeared. Moreover, the basic sites on the bone char surface facilitated acid reduction and deoxygenation through ketonization and aldol condensation reactions, which effectively reduced the oxygen content in the products (except for esters). Quantum chemical calculations further revealed that Ca²⁺ inhibited the retro-ene reactions, which suppressed the formation of ethylene and phenols, consistent with the Py-GC/MS results.

本研究通过热解-气相色谱/质谱（Py-GC/MS）和密度泛函理论计算，研究了骨炭对棉秆热解焦油组分转化的影响。结果表明，骨炭和骨炭灰对焦油的化学成分均有催化裂化作用。600℃时，棉秆热解焦油主要由酮类、酚类、酯类和烃类组成，酸含量较低。骨炭的加入促进了棉秆热解过程中的酯化反应，使气态焦油转化为酯类，降低了酮类和醇类的含量。酚类化合物含量分别显著下降12.72%和11.9%，几乎消失。此外，骨炭表面的碱性位点有利于通过酮化反应和醛醇缩合反应进行酸还原和脱氧，从而有效地降低了产物中的氧含量（酯类除外）。量子化学计算进一步表明，Ca2+抑制了反转录-烯反应，从而抑制了乙烯和酚的形成，与Py-GC/MS结果一致。

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引用次数: 0

An efficient small-scale biomass cogeneration plant with silicon tetrachloride as working fluid: Techno-economic analysis 以四氯化硅为工质的高效小型生物质热电联产装置：技术经济分析

IF 9.1 1区工程技术 Q1 ENERGY & FUELS

Renewable Energy

Pub Date : 2026-01-11 DOI: 10.1016/j.renene.2026.125272

M. Doninelli, G. Di Marcoberardino, C.M. Invernizzi, P. Iora

Biomass-fired Organic Rankine Cycles are a well-established solution for combined heat and power. However, unlike other renewable technologies, the cost of generation from biomass has not decreased over time, because of high capital requirements and persistent biomass prices. To address this issue, Silicon Tetrachloride (SiCl₄) has been recently proposed as an innovative working fluid in high-temperature Rankine cycles, offering significant efficiency gains due to outstanding thermal stability, compared to typical organic fluids.

This work explores the techno-economic feasibility of coupling a 1 MW gross electric SiCl₄ cycle with a biomass boiler. By utilizing commercial molten salts as the heat carrier, instead of conventional thermal oil, the system operates at a turbine inlet temperature of 525 °C. The annual performance of the proposed CHP plant is assessed under both baseload and load-following scenarios within an existing district heating network. The cycle's off-design behaviour is analysed at part-load and full-electric conditions. With a condensing temperature of 100 °C, the gross cycle efficiency reaches 32.3 % at nominal power. While state-of-the-art ORC is economically viable only when they exceed 5′000 h equivalent annual operating hours, the SiCl₄ plant is beneficial in contexts with limited cogeneration hours (mild climates) and significant heat rejection during the non-heating season.

生物质燃烧的有机朗肯循环是一种成熟的热电联产解决方案。然而，与其他可再生技术不同，由于高资本要求和持续的生物质价格，生物质发电的成本并没有随着时间的推移而下降。为了解决这个问题，四氯化硅（SiCl4）最近被提出作为高温朗肯循环的创新工作流体，与典型的有机流体相比，由于其出色的热稳定性，可以显著提高效率。这项工作探讨了将1兆瓦总电力SiCl4循环与生物质锅炉耦合的技术经济可行性。通过使用商业熔盐作为热载体，而不是传统的导热油，该系统在525°C的涡轮入口温度下运行。拟议的热电联产电厂的年度表现是在现有区域供热网络的基本负荷和负荷跟踪情况下进行评估的。分析了该循环在部分负荷和全电工况下的非设计行为。当冷凝温度为100℃时，总循环效率在标称功率下达到32.3%。最先进的ORC只有在年运行时间超过5000小时时才具有经济可行性，而SiCl4电厂在热电联产时间有限（温和气候）和非供暖季节大量排热的情况下是有益的。

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引用次数: 0

Design and optimization of a uniform full-circumference solar thermal chemical reactor operating at high temperature based on elliptical bifocal optical properties 基于椭圆双焦光学特性的高温均匀全周太阳热化学反应器的设计与优化

IF 9.1 1区工程技术 Q1 ENERGY & FUELS

Renewable Energy

Pub Date : 2026-01-10 DOI: 10.1016/j.renene.2026.125257

Huicheng Li , Ruilin Wang , Li Zhang , Renhai Wang , Huanwen Zhong , Yafei Guo , Hongsheng Wang , Jian Sun , Chuanwen Zhao , Hui Hong

A solar reactor design methodology utilizing elliptical bifocal optical properties is proposed to address severe temperature non-uniformity caused by uneven flux distribution in high-temperature solar thermochemical processes. The system features an optical configuration where point-focused radiation is concentrated at the primary focal point, diverged by a specially designed refractor, and subsequently reflected by the ellipsoidal cavity to uniformly reconverge onto the reactor surface at the secondary focal point. Based on an error-validated model, simulations were performed to synergistically optimize key parameters—including elliptical eccentricity, reactor position, and prolate-pear refractor geometry—through parametric investigation and particle swarm optimization. This reduced the relative standard deviation of energy flux density to 17.82, representing an 80.1 % improvement over conventional direct irradiation systems. Multiphysics validation using methane steam reforming demonstrated exceptional performance: maximum temperature difference was reduced to 28.53 K (71.98 % decrease) while achieving 99.12 % methane conversion (8.67 percentage-point increase). This design strategy demonstrates broad applicability in high-temperature solar thermochemical processes, including methane dry and steam reforming. By fundamentally shortening the radiative heat transfer path, it effectively eliminates thermal resistance-induced temperature imbalances in porous media, thereby preventing the formation of local hotspots and avoiding potential damage such as sintering and carbon deposition in solar reactors.

为了解决高温太阳热化学过程中由于通量分布不均匀而导致的严重的温度不均匀性，提出了一种利用椭圆双焦光学特性的太阳反应器设计方法。该系统具有光学结构，其中点聚焦辐射集中在主焦点，通过特殊设计的折射器发散，随后被椭球腔反射，均匀地重新汇聚到二次焦点的反应堆表面。基于误差验证模型，通过参数调查和粒子群优化，对关键参数进行协同优化，包括椭圆偏心率、反应器位置和长形-梨形折射几何。这将能量通量密度的相对标准偏差降低到17.82，比传统的直接辐照系统提高了80.1%。甲烷蒸汽重整的多物理场验证显示出优异的性能：最大温差降至28.53 K（降低71.98%），而甲烷转化率达到99.12%（提高8.67%）。该设计策略在高温太阳能热化学过程中具有广泛的适用性，包括甲烷干燥和蒸汽重整。从根本上缩短了辐射传热路径，有效地消除了多孔介质中热阻引起的温度不平衡，从而防止了局部热点的形成，避免了太阳能反应器中烧结和积碳等潜在损伤。

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引用次数: 0

Tunable ATO-ZnO hybrid nanofluids as high-stability spectral beam splitters for efficient photovoltaic/thermal systems 可调谐ATO-ZnO混合纳米流体作为高效光伏/热系统的高稳定性光谱分束器

IF 9.1 1区工程技术 Q1 ENERGY & FUELS

Renewable Energy

Pub Date : 2026-01-10 DOI: 10.1016/j.renene.2025.125161

Jiahao Li , Abdulaziz Alasiri , Ali Omer , Xiong Zheng

Nanofluids incorporating metal nanoparticles hold considerable promise for optimizing spectral beam splitting in photovoltaic/thermal (PV/T) systems, but conventional metal based nanofluids suffer from poor stability and high cost. This study introduces highly stable ATO-ZnO hybrid nanofluids as a novel SBS for PV/T systems, resolving critical limitations of conventional metal-based nanofluids. Leveraging complementary optical properties—ZnO's exceptional ultraviolet (UV) absorption via direct bandgap transitions and ATO's strong IR harvesting through plasmonic resonance—the hybrid nanofluid exhibits enhanced optical transmittance (650–1050 nm) within the photovoltaic response band, while demonstrating strong absorption across other spectral regions. The nanofluids demonstrate outstanding long-term stability. In PV/T testing, the hybrid system sets a new benchmark with 13.59 % electrical efficiency and 57.69 % thermal efficiency, achieving a merit function of 1.692 - substantially higher than values reported for metallic nanofluid SBSs in prior studies. Performance superiority originates from quantum-enhanced UV absorption and synergistic heat localization. Synthesized via scalable aqueous processing at low material cost, this technology establishes a new paradigm for solar energy utilization through simultaneous optimization of optical efficiency, thermal stability, and economic viability.

包含金属纳米颗粒的纳米流体在优化光伏/热（PV/T）系统中的光谱光束分裂方面具有相当大的前景，但传统的金属基纳米流体存在稳定性差和成本高的问题。本研究引入了高度稳定的ATO-ZnO混合纳米流体作为PV/T系统的新型SBS，解决了传统金属基纳米流体的关键局限性。利用互补的光学特性- zno通过直接带隙跃迁的特殊紫外（UV）吸收和ATO通过等离子体共振的强红外收获-混合纳米流体在光伏响应带内表现出增强的光学透射率（650-1050 nm），同时在其他光谱区域表现出强吸收。纳米流体表现出优异的长期稳定性。在PV/T测试中，混合系统设定了新的基准，电效率为13.59%，热效率为57.69%，实现了1.692的价值函数，大大高于先前研究中金属纳米流体sbs的报告值。性能优势源于量子增强的紫外线吸收和协同热定位。该技术通过可扩展的水处理以低材料成本合成，通过同时优化光学效率，热稳定性和经济可行性，为太阳能利用建立了新的范例。

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引用次数: 0

Performance and exergy analysis of a NaBH4/Al coupled hydrolysis hydrogen production solid oxide fuel cell hybrid turbofan system with integrated water circulation 集成水循环的NaBH4/Al耦合水解制氢固体氧化物燃料电池混合动力涡扇系统性能及火用分析

IF 9.1 1区工程技术 Q1 ENERGY & FUELS

Renewable Energy

Pub Date : 2026-01-09 DOI: 10.1016/j.renene.2026.125219

Zhichao Chen , Chaolei Dang , Xiaoge Tan , Chenhao Li , Chan Ha , Jiang Qin , Wei Cheng

To address the escalating electrical power demands, extend endurance, and simultaneously improve fuel economy for unmanned aerial vehicles (UAVs), this study proposes and comprehensively evaluates a novel solid oxide fuel cell hybrid turbofan system. This system innovatively integrates NaBH₄/Al coupled hydrolysis for on-board hydrogen generation and features an integrated water circulation system. Thermodynamic models for the engine, reactor, and fuel cell were developed and validated, enabling detailed performance and exergy analyses. Comparative evaluations with a conventional turbofan engine revealed the proposed hybrid system's superior performance, particularly the version incorporating an anode recirculation pump. For instance, at a 35 % electric power fraction, this system achieved a 28.22 % reduction in specific fuel consumption, a 16.95 % increase in thermal efficiency, and a 12.57 % increase in overall efficiency compared to a conventional turbofan. Parametric analyses on fuel cell system, engine, and flight parameters identified optimal operating conditions, with exergy analysis pinpointing the engine combustion chamber as the primary source of irreversible losses. This novel hybrid propulsion system offers a compelling solution for achieving long-endurance, high-efficiency UAV operations with reduced fuel consumption, providing critical technical support for future aviation electrification.

为了解决不断升级的电力需求，延长续航时间，同时提高无人机的燃油经济性，本研究提出并全面评估了一种新型固体氧化物燃料电池混合动力涡轮风扇系统。该系统创新地集成了NaBH4/Al偶联水解，用于车载制氢，并具有集成的水循环系统。开发并验证了发动机、反应堆和燃料电池的热力学模型，实现了详细的性能和火用分析。与传统涡扇发动机的对比评估表明，该混合动力系统性能优越，特别是采用阳极再循环泵的版本。例如，与传统涡轮风扇相比，在35%的电力功率下，该系统的油耗降低了28.22%，热效率提高了16.95%，整体效率提高了12.57%。对燃料电池系统、发动机和飞行参数的参数分析确定了最佳运行条件，并通过火用分析确定了发动机燃烧室是不可逆损失的主要来源。这种新型混合动力推进系统提供了一种引人注目的解决方案，可以在降低燃油消耗的情况下实现无人机的长航时、高效率操作，为未来的航空电气化提供关键技术支持。

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引用次数: 0

Projected increases in wave energy magnitude and variability in the Yellow and Bohai Seas under a high-emission climate scenario 高排放气候情景下黄渤海波浪能量级和变率的预估增加

IF 9.1 1区工程技术 Q1 ENERGY & FUELS

Renewable Energy

Pub Date : 2026-01-09 DOI: 10.1016/j.renene.2026.125242

Ning Yuan , Xuecheng Zhang , Luming Shi , Hongda Shi , Bingchen Liang , Zhenlu Wang , Haofeng Xia

This study investigates changes in wave energy magnitude and variability in the Yellow and Bohai Seas under a high-emission future climate scenario. Future wave conditions are simulated using a spectral wave model driven by wind fields from a high-resolution global circulation model. The analysis delves into spatiotemporal variations in wave energy, along with its availability and stability. Results indicate a general increasing trend in annual mean wave energy throughout the 21st century, especially in the southern Yellow Sea. The projected increase is characterized by a shift toward more frequent high-energy, accompanied by a reduction in low-energy, short-period waves. Assessing wave energy exploitability suggests increasing available resources in nearshore regions, particularly south of the Shandong Peninsula. However, wave energy stability is projected to decline, indicated by increasing monthly and seasonal variability. On monthly and seasonal scales, wave energy tends to decrease in October, December, and January, especially in the Bohai Sea, while increasing at varied rates in other months. Wave energy generally peaks in winter with relatively low variance and reaches a minimum in summer with high variability. These findings provide quantitative insights to support the planning and optimization of regional wave energy development under future climate change.

本文研究了未来高排放气候情景下黄渤海波浪能的大小和变率变化。利用高分辨率全球环流模式的风场驱动的谱波模式模拟未来的波浪条件。该分析深入研究了波能的时空变化，以及它的可用性和稳定性。结果表明，在整个21世纪，年平均波能总体呈上升趋势，特别是在黄海南部。预估的增加的特点是向更频繁的高能波转变，同时伴随着低能量、短周期波的减少。评估波浪能的可利用性建议增加近岸地区，特别是山东半岛南部的可用资源。然而，波浪能量稳定性预计将下降，表现为月度和季节变化的增加。在月、季尺度上，波能在10月、12月和1月呈下降趋势，特别是渤海，而在其他月份则有不同幅度的上升。波浪能通常在冬季达到峰值，变化相对较小，在夏季达到最低，变化较大。这些发现为支持未来气候变化下区域波浪能开发的规划和优化提供了定量见解。

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引用次数: 0

Mooring-based frequency-domain and AI-based time-domain optimization for improved power capture performance of the TALOS wave energy converter 基于系泊的频域和基于人工智能的时域优化，以提高TALOS波能转换器的功率捕获性能

IF 9.1 1区工程技术 Q1 ENERGY & FUELS

Renewable Energy

Pub Date : 2026-01-09 DOI: 10.1016/j.renene.2026.125241

Hakan Yavuz , Wanan Sheng , George Aggidis

Mooring-based frequency-domain analysis combined with AI-based time-domain optimization offers a systematic approach to improving power capture performance in multi-degree-of-freedom wave energy converters. While most existing studies focus on single-degree-of-freedom systems, enhanced energy absorption can be achieved by exploiting the dynamic potential of multi-DoF configurations. This study investigates the TALOS wave energy converter, a six-degree-of-freedom system, with the objective of improving its power capture capability through coordinated mooring and power take-off (PTO) optimization. The optimization framework begins with a frequency-domain analysis to assess the influence of mooring parameters on the system response. Based on this analysis, two refined configurations, denoted as TALOS-L and TALOS-H, are developed using optimized mooring stiffness characteristics. Subsequently, time-domain simulations are conducted using a genetic algorithm to determine optimal PTO damping settings under site-specific sea conditions. The results show that adaptive tuning of both mooring and PTO parameters significantly improves power capture across different sea states. In particular, the TALOS-H configuration, featuring tuned surge mooring stiffness and genetically optimized PTO damping, consistently outperforms the baseline configuration. These findings highlight the importance of site-specific tuning and demonstrate the effectiveness of AI-based optimization for enhancing the adaptability and efficiency of multi-degree-of-freedom wave energy converters.

基于系泊的频域分析与基于人工智能的时域优化相结合，为提高多自由度波能转换器的功率捕获性能提供了一种系统的方法。虽然现有的大多数研究都集中在单自由度系统上，但通过利用多自由度结构的动态潜力可以实现增强的能量吸收。本文对六自由度系统TALOS波浪能转换器进行了研究，目的是通过协调系泊和功率输出（PTO）优化来提高其能量捕获能力。优化框架从频域分析开始，评估系泊参数对系统响应的影响。在此基础上，根据优化的系泊刚度特性，开发了两种优化配置，分别为TALOS-L和TALOS-H。随后，使用遗传算法进行时域模拟，以确定现场特定海况下的最佳PTO阻尼设置。结果表明，系泊和PTO参数的自适应调谐显著提高了不同海况下的功率捕获。值得一提的是，TALOS-H配置具有调校的浪涌系泊刚度和基因优化的PTO阻尼，始终优于基线配置。这些发现突出了特定地点调谐的重要性，并证明了基于人工智能的优化对于提高多自由度波能转换器的适应性和效率的有效性。

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引用次数: 0

Intelligent monitoring of photovoltaic panel cleaning status: Fine-Scale dust accumulation estimation using hyperspectral data and mixed-pixel model 光伏板清洁状态的智能监测：利用高光谱数据和混合像元模型进行细尺度积尘估算

IF 9.1 1区工程技术 Q1 ENERGY & FUELS

Renewable Energy

Pub Date : 2026-01-09 DOI: 10.1016/j.renene.2026.125206

Jianying Zhang , Shaogang Lei , Yu Tian , Yibo Zhao , Meng Li , Shengya Sun

Dust accumulation on the surface of photovoltaic panels is one of the key factors affecting the operational performance of PV systems. Hyperspectral remote sensing, with its high-dimensional and fine spectral resolution, shows great potential in PV pollution monitoring. However, our observations indicate that, for dust-covered PV panels, each spectral pixel often contains a composite signal generated by both the PV surface and the deposited dust. This microscopic mixed-pixel phenomenon is often overlooked, limiting existing monitoring approaches—based on single-spectrum analysis or traditional image processing—to macroscopic identification, and making it difficult to reveal the intrinsic relationship between dust density and spectral response. To address this issue, this study proposes a dust monitoring method for PV panels that integrates mixed-pixel spectral unmixing, enabling high-precision monitoring of different dust accumulation states. A spectral-index-optimized non-negative least squares method was first applied to estimate the abundances of the PV panel and dust components. The resulting abundance information was then incorporated into a dust density inversion model, and multiple machine learning algorithms were used to systematically compare the effects of different preprocessing strategies and sensitive-band extraction methods on model performance. The results showed that incorporating mixed-pixel abundance features significantly improved model accuracy and stability (R² = 0.9615, RMSE = 10.0092 g/m²). When the dust density reached 46.21 g/m², the reflectance in the 440–675 nm range exhibited an inflection point, changing from a decreasing to an increasing trend. The corresponding dust proportion (64 %) slightly exceeded 50 %, making dust the dominant contributor to the spectral signal and indicating a transition in the dust layer from single to multiple scattering. This study provides theoretical support and technical foundations for intelligent PV soiling monitoring and optimized cleaning scheduling.

光伏板表面积尘是影响光伏系统运行性能的关键因素之一。高光谱遥感以其高维、精细的光谱分辨率，在光伏污染监测中显示出巨大的潜力。然而，我们的观察表明，对于灰尘覆盖的光伏板，每个光谱像素通常包含由光伏表面和沉积的灰尘产生的复合信号。这种微观的混合像元现象往往被忽视，使现有的基于单光谱分析或传统图像处理的监测方法局限于宏观识别，难以揭示粉尘密度与光谱响应之间的内在关系。针对这一问题，本研究提出了一种集成混合像元光谱解混的光伏板粉尘监测方法，实现对不同粉尘积累状态的高精度监测。首先采用光谱指数优化的非负最小二乘法对光伏板和粉尘组分的丰度进行估算。然后将丰度信息纳入尘埃密度反演模型，并使用多种机器学习算法系统地比较不同预处理策略和敏感波段提取方法对模型性能的影响。结果表明，混合像元丰度特征显著提高了模型精度和稳定性（R2 = 0.9615, RMSE = 10.0092 g/m2）。当尘埃密度达到46.21 g/m2时，440 ~ 675 nm范围内的反射率出现拐点，由减小趋势转为增大趋势。相应的尘埃比例（64%）略高于50%，表明尘埃是光谱信号的主要贡献者，表明尘埃层从单次散射向多次散射过渡。本研究为光伏智能污染监测和优化清洁调度提供了理论支持和技术基础。

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引用次数: 0

Sustainability assessment of supply chains for green hydrogen production 绿色制氢供应链的可持续性评估

IF 9.1 1区工程技术 Q1 ENERGY & FUELS

Renewable Energy

Pub Date : 2026-01-09 DOI: 10.1016/j.renene.2026.125249

Lydia Stougie , Hedzer van der Kooi , Gijsbert Korevaar

The sustainability of supply chains for green hydrogen production is compared from a life cycle point of view: 1) offshore electrolysis with electricity from Dutch wind farms followed by pipeline transport of hydrogen to Rotterdam (Netherlands), 2) onshore electrolysis in Rotterdam with electricity from the same wind farms, 3) electrolysis with electricity from solar PV in Algeria followed by pipeline transport of hydrogen and 4) electrolysis and ammonia production with electricity from solar PV in Saudi Arabia followed by deep sea transport and ammonia cracking. The environmental sustainability is assessed with ReCiPe 2016 and Environmental Footprint 3.0. The Total Cumulative Exergy Loss (TCExL) method is used to calculate the exergetic sustainability. According to the endpoint scores, offshore electrolysis with wind energy is preferred, but the difference between the TCExL scores of both wind energy options is small. The preference order of the other supply chains is undecided. The offshore wind option is also preferred according to the midpoint indicators GWP/climate change, land use and water consumption/use. It is advised that the systems be investigated in more detail before drawing conclusions about the order of preference and that also attention be paid to the economic and social pillars of sustainability.

从生命周期的角度比较了绿色氢生产供应链的可持续性：1)荷兰风电场的海上电解，然后用管道将氢气输送到鹿特丹（荷兰）；2)鹿特丹的陆上电解，使用相同风电场的电力；3)阿尔及利亚的太阳能光伏发电，然后用管道输送氢气；4)沙特阿拉伯的太阳能光伏发电，然后用深海运输和氨裂解进行电解和制氨。环境可持续性采用ReCiPe 2016和environmental Footprint 3.0进行评估。用总累积火用损失（TCExL）法计算了火用可持续性。根据终点得分，海上电解与风能是首选，但两种风能选项的TCExL得分之间的差异很小。其他供应链的优先顺序未定。根据GWP/气候变化、土地利用和水消耗/使用的中点指标，海上风电也是首选方案。建议在就优先次序作出结论之前对这些系统进行更详细的调查，并注意可持续性的经济和社会支柱。

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引用次数: 0

Enhancing melting-solidification performance of latent heat thermal energy storage units with twisted fins 提高扭曲翅片潜热蓄热装置的熔化凝固性能

IF 9.1 1区工程技术 Q1 ENERGY & FUELS

Renewable Energy

Pub Date : 2026-01-09 DOI: 10.1016/j.renene.2026.125250

Songzhen Tang , Dongliang Zhang , Wei Wang , Huan Xi , Xuehong Wu , Ming Guo

To enhance the heat transfer efficiency of latent heat storage devices, this study proposed a novel composite fin structure and applied it to vertical shell-and-tube latent heat thermal energy storage (LHTES) units. The enthalpy-porosity method was used for numerical simulation of the phase change process, and the heat storage and release performance of different units was systematically evaluated. The results indicated that the novel configuration, combining longitudinal and twisted fins, significantly enhanced both natural convection and heat conduction, effectively compensating for the heat transfer limitations of traditional longitudinal and annular fins. Compared with conventional longitudinal fins, it reduced the complete melting and solidification time of the phase change material (PCM) by 32.57 % and 23.05 %. Although its complete solidification time was slightly longer than that of conventional annular fins, it achieved the highest heat storage and release rates. When the PCM reached a phase change fraction of 0.95, the heat storage and release capacities of this structure were 10.9 % and 3.4 % higher than those of annular fins, respectively. This study provides theoretical guidance for the design and development of new large-scale, high-efficiency latent heat storage devices.

为了提高潜热蓄热装置的换热效率，提出了一种新型复合翅片结构，并将其应用于立式壳管式潜热蓄热装置。采用焓孔法对相变过程进行数值模拟，系统评价了不同单元的储放热性能。结果表明，纵向翅片和扭曲翅片相结合的新型结构能够显著增强自然对流和热传导，有效地弥补了传统纵向翅片和环形翅片的传热局限性。与传统纵翅片相比，相变材料的完全熔化和凝固时间分别缩短了32.57%和23.05%。虽然其完全凝固时间略长于传统环形翅片，但其蓄热和放热速率最高。当相变分数为0.95时，该结构的蓄热和放热能力分别比环形翅片高10.9%和3.4%。本研究为新型大型、高效潜热装置的设计与开发提供了理论指导。

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引用次数: 0