Renewable Energy最新文献_第3页

Development and techno-economic analysis of an innovative U-shaped geothermal system with artificial geyser 新型u型人工间歇泉地热系统的开发与技术经济分析

IF 9.1 1区工程技术 Q1 ENERGY & FUELS

Renewable Energy

Pub Date : 2026-04-15 Epub Date: 2026-01-30 DOI: 10.1016/j.renene.2026.125349

Ziming Chen , Fei Xiao , Liming Fan , Zihao Niu , Xiaolong Liu , Yong Yan , Wenshuai Xu , Lei Han , Lizhong Yang

Geothermal energy from hot dry rock is a sustainable energy source with vast reserves in the Earth's crust. Open-loop geothermal systems can extract geothermal energy on a large scale but pose serious environmental problems, whereas closed-loop systems with multiple branches for enhanced heat extraction performance suffer from high pumping power consumption. This study proposes an artificial geyser U-shaped geothermal system to address prior limitations of common closed-loop systems. The flashing chamber design realizes natural circulation to reduce investment and operational costs. A validated numerical model shows that a well of 5 km depth and 0.06 K m⁻¹ temperature gradient can generate up to 1.4 MW of power by the steam turbine, while 50–400 kW by the thermoelectric generator, depending on geothermal gradients and cold-side fluids. By retrofitting abandoned oil and gas wells to significantly reduce the drilling costs, the system's levelized cost of electricity is $0.1 kWh⁻¹ at a turbine power output of 700 kW. The discounted payback period is 15 years when the electricity price is $0.2 kWh⁻¹. The above results show that this system offers a good balance between capacity and cost-effectiveness. This work advances geothermal energy development through sustainable, low-carbon, and low-risk pathways.

来自干热岩石的地热能是一种可持续能源，在地壳中储量巨大。开环地热系统可以大规模地提取地热能，但存在严重的环境问题，而多支路的闭环系统则存在抽热能耗高的问题。本研究提出了一种人工间歇泉u型地热系统，以解决常规闭环系统的局限性。闪蒸室设计实现自然循环，降低投资和运行成本。经过验证的数值模型表明，根据地温梯度和冷侧流体的不同，一口井深为5 km，温度梯度为0.06 K m−1，蒸汽轮机可产生高达1.4 MW的功率，而热电发电机可产生50-400 kW的功率。通过改造废弃的油气井，大大降低了钻井成本，该系统的平准化电力成本为0.1千瓦时−1美元，涡轮机输出功率为700千瓦。当电价为$0.2 kWh−1时，贴现回收期为15年。上述结果表明，该系统在容量和成本效益之间取得了很好的平衡。这项工作通过可持续、低碳和低风险的途径推进了地热能的开发。

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引用次数: 0

Performance study and assembly optimization of tandem two-cylinder energy harvesting systems utilizing flow-induced vibration 流激振动串联双缸能量收集系统性能研究与装配优化

IF 9.1 1区工程技术 Q1 ENERGY & FUELS

Renewable Energy

Pub Date : 2026-04-15 Epub Date: 2026-02-05 DOI: 10.1016/j.renene.2026.125346

Kai Guo , Wenzhe Dong , Yuxuan Cheng , Hongsheng Zhang , Yue Wang

In this work, we propose and thoroughly examine the efficacy of tandem piezoelectric wind energy harvester system. A novel assembly of two-set system is proposed to establish stable high efficiency energy harvesting. As to two tandem cylinder system, three regimes are identified: in Regime I (1.3≤L/D ≤ 1.5), the upstream cylinder exhibits galloping, while the downstream cylinder undergoes combined vortex-induced vibration (VIV) and wake-induced galloping (WIG); in Regime II (2.0≤L/D ≤ 3.0), the upstream cylinder behaves combined or separated VIV and WIG, while the downstream cylinder only shows combine VIV and WIG; in Regime III (3.0<L/D ≤ 4.0), the upstream cylinder transitions to a typical VIV state, and the downstream cylinder experiences separated VIV and WIG. Base on the flow-induced vibration regimes of two-cylinder system, a novel assembly strategy is proposed to enhance the overall performance in practical applications. Notably, the assembly of two-set modules achieves a maximum output power of 4.48 mW at U = 10 m/s and a maximum efficiency of 6.16% at U = 2.7 m/s when the assembly distance is 1.3. It even attains a higher efficiency of 7.14% at U = 1.8 m/s when the assembly distance is 3.0. The new design can make all cylinders fall into contiguous VIV-WIG mechanism, and exhibits higher efficiency and power in a broad range of wind velocity.

在这项工作中，我们提出并深入研究了串联压电风能收集系统的有效性。为了实现稳定高效的能量收集，提出了一种新型的双集系统组合。对于双串联气缸系统，确定了三种工况：工况I(1.3≤L/D≤1.5)，上游气缸为驰振，下游气缸为涡激振动（VIV）和尾迹诱导驰振（WIG）组合；状态II(2.0≤L/D≤3.0)，上游缸表现为复合或分离的涡动与WIG，下游缸只表现为复合涡动与WIG；状态III (3.0<L/D≤4.0)，上游气缸过渡到典型的VIV状态，下游气缸经历VIV和WIG的分离。针对双缸系统的流激振动特性，提出了一种新的装配策略，以提高实际应用中的整体性能。值得注意的是，当装配距离为1.3时，两组组件在U = 10 m/s时的最大输出功率为4.48 mW，在U = 2.7 m/s时的最大效率为6.16%。当装配距离为3.0时，在U = 1.8 m/s时效率达到7.14%。新设计可使各气缸进入连续的VIV-WIG机构，在大风速范围内表现出更高的效率和功率。

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引用次数: 0

Spot price fluctuations of battery-grade lithium carbonate and supply chain disruptions: The survival game of new energy enterprises 电池级碳酸锂现货价格波动与供应链中断：新能源企业的生存博弈

IF 9.1 1区工程技术 Q1 ENERGY & FUELS

Renewable Energy

Pub Date : 2026-04-15 Epub Date: 2026-02-02 DOI: 10.1016/j.renene.2026.125372

Boqiang Lin , Jiangnan Li

Amid the global energy transition, China's new energy industry has rapidly grown. Lithium-ion batteries, central to new energy vehicles and energy storage systems, rely on battery-grade lithium carbonate as a core material. From 2020 to 2023, the spot price of battery-grade lithium carbonate fluctuated drastically, from stagnation and recovery to sharp rises and declines, disrupting the new energy supply chain. This underscores the need to strengthen the security of the industry and supply chain. Our study, based on data from new energy listed companies for eight quarters from Q2 2021 to Q1 2023, uses fixed effect models and generalized additive models to explore the relationship between the spot price fluctuations of battery-grade lithium carbonate and the inventory turnover time of new energy enterprises. The study finds that first, changes in battery-grade lithium carbonate prices exert a significant negative impact on enterprises' inventory turnover time. Second, enterprises with weaker bargaining power adopt more aggressive inventory reduction strategies. Third, during the early stage of lithium carbonate price surges, some companies engaged in stockpiling to alleviate potential subsequent inventory pressure, which ultimately led to over-adjusted turnover times in later periods. Compared to previous literature, this paper breaks through the linear analysis paradigm and reveals the underlying changes in supply chain shocks through the GAM model, providing new empirical evidence for the management of new energy supply chains. We advocate for a collaborative mechanism to mitigate supply chain shocks from price fluctuations.

在全球能源转型的大背景下，中国新能源产业快速发展。锂离子电池是新能源汽车和储能系统的核心，它依赖于电池级碳酸锂作为核心材料。从2020年到2023年，电池级碳酸锂现货价格波动剧烈，从停滞和复苏到大幅上涨和下跌，扰乱了新能源供应链。这凸显了加强行业和供应链安全的必要性。本研究以新能源上市公司2021年Q2 - 2023年Q1八个季度的数据为基础，采用固定效应模型和广义加性模型，探讨电池级碳酸锂现货价格波动与新能源企业库存周转时间的关系。研究发现，第一，电池级碳酸锂价格的变化对企业库存周转时间有显著的负向影响。第二，议价能力较弱的企业采取更激进的去库存策略。第三，在碳酸锂价格飙升的早期，一些公司进行了库存，以缓解潜在的后续库存压力，最终导致后期过度调整周转时间。与以往文献相比，本文突破了线性分析范式，通过GAM模型揭示了供应链冲击的深层次变化，为新能源供应链管理提供了新的经验证据。我们主张建立合作机制，减轻价格波动对供应链的冲击。

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引用次数: 0

Multi-dimensional sustainability assessment framework for offshore wind energy: A game-theoretic and extenics-based approach 海上风能多维可持续性评估框架：博弈论和基于可拓性的方法

IF 9.1 1区工程技术 Q1 ENERGY & FUELS

Renewable Energy

Pub Date : 2026-04-15 Epub Date: 2026-02-05 DOI: 10.1016/j.renene.2026.125399

Jian Hao, Bingqian Meng, Shuyu Li

Offshore wind power is a key pillar of the clean-energy transition, yet ensuring the sustainability of projects demands rigorous multi-dimensional assessment. Current evaluation frameworks often focus on single aspects (e.g., economic or environmental) and suffer from subjectivity in weight assignments and poor handling of uncertainty. Here we propose a novel comprehensive assessment framework that integrates four critical dimensions - technological innovation, market dynamics, policy support, and safety resilience - to evaluate offshore wind sustainability. Methodologically, we introduce a dynamic weighting mechanism that innovatively applies game theory to harmonize objective (CRITIC) and subjective (Anti-entropy) weighting schemes within a Nash equilibrium framework, ensuring a stable and balanced representation of indicator importance. We integrate a pioneering matter-element Extenics cloud model to quantitatively characterize the coupled fuzziness and randomness of multi-dimensional indicators, significantly enhancing the framework's robustness in managing uncertainty and supporting complex sustainability evaluations. Applying this to China's four major offshore regions reveals distinct sustainability profiles: East China leads with the highest scores in innovation and policy support, while other regions lag due to resource and policy gaps. These findings provide tailored insights for regional development and demonstrate the value of our quantitative, multi-dimensional decision-support tool for guiding sustainable offshore wind development globally.

海上风电是清洁能源转型的关键支柱，但确保项目的可持续性需要严格的多维评估。目前的评价框架往往侧重于单一方面（如经济或环境），在权重分配方面存在主观性，对不确定性处理不力。在这里，我们提出了一个新的综合评估框架，该框架整合了四个关键维度——技术创新、市场动态、政策支持和安全弹性——来评估海上风电的可持续性。在方法上，我们引入了一种动态加权机制，创新地应用博弈论在纳什均衡框架内协调客观（CRITIC）和主观（Anti-entropy）加权方案，确保指标重要性的稳定和平衡表示。我们整合了一个开创性的物元可拓云模型来定量表征多维指标的耦合模糊性和随机性，显著增强了框架在管理不确定性和支持复杂可持续性评估方面的稳健性。将其应用于中国四大近海地区，可以发现其独特的可持续性特征：华东地区在创新和政策支持方面得分最高，而其他地区则因资源和政策差距而落后。这些发现为区域发展提供了量身定制的见解，并展示了我们的定量、多维决策支持工具在指导全球可持续海上风电开发方面的价值。

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引用次数: 0

Charting the energy future of the Galapagos: Smart planning for a fossil-free archipelago by 2040 and full decarbonization by 2050 绘制加拉帕戈斯群岛的能源未来：到2040年实现无化石群岛的明智规划，到2050年实现完全脱碳

IF 9.1 1区工程技术 Q1 ENERGY & FUELS

Renewable Energy

Pub Date : 2026-04-15 Epub Date: 2026-02-03 DOI: 10.1016/j.renene.2026.125370

Daniel Icaza-Alvarez , Fernando González-Ladrón-de-Guevara , David Borge-Diez

This research presents the planning for the long-term energy transition of the Galapagos Islands. According to Ecuador's strategic plans, it is necessary to free itself from fossil fuels by 2040, while by 2050, it is required to achieve complete decarbonization. The archipelago is a beautiful ecological attraction, considered a living laboratory and of great interest to researchers from various parts of the world. The applied methodology evaluates the starting scenario with data on installed capacity and energy production, then with the support of the energyPLAN simulation model determine the transition process to achieve a 100% renewable system for the Galapagos Islands. The results prove that by 2040, it is possible to supply the archipelago with a complete renewable energy mix of 43.22% solar photovoltaic, 34.22% wind, and 22.56% other diverse technologies. For 2050, 45.66% solar photovoltaic, 36.22% wind, and 18.1% other diverse technologies should be included to achieve the objectives. The full decarbonization effort, which also includes other technologies such as biofuels, geothermal energy, and wave energy, amounts to $92 million. The methodology and the results can be applied to similar case studies and scenarios worldwide and establish a reference frame for this analysis.

本研究提出了加拉帕戈斯群岛长期能源转型的规划。根据厄瓜多尔的战略规划，到2040年必须摆脱化石燃料，到2050年必须实现完全脱碳。这个群岛是一个美丽的生态景点，被认为是一个活生生的实验室，对来自世界各地的研究人员非常感兴趣。应用方法根据装机容量和能源生产数据评估初始情景，然后在energyPLAN模拟模型的支持下确定过渡过程，以实现加拉帕戈斯群岛100%的可再生能源系统。结果证明，到2040年，有可能为群岛提供43.22%的太阳能光伏，34.22%的风能和22.56%的其他多种技术的完整可再生能源结构。到2050年，要实现这一目标，太阳能光伏发电占45.66%，风能占36.22%，其他多种技术占18.1%。全面的脱碳努力，还包括生物燃料、地热能和波浪能等其他技术，总计达9200万美元。该方法和结果可应用于全球类似的案例研究和情景，并为这一分析建立一个参考框架。

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引用次数: 0

Optimization design of CSP particle receiver based on multi scale modeling: Comprehensive numerical and experimental study of photothermal performance 基于多尺度建模的CSP粒子接收器优化设计：光热性能综合数值与实验研究

IF 9.1 1区工程技术 Q1 ENERGY & FUELS

Renewable Energy

Pub Date : 2026-04-15 Epub Date: 2026-02-07 DOI: 10.1016/j.renene.2026.125411

Xiaoyu Xu, Qiang Yu, Fansheng Cheng, Zihao Li, Bingyan Shi, Jie Zhang

The particle receiver using solid particles as the heat transfer medium is considered the most critical energy conversion component in supercritical carbon dioxide solar thermal power generation systems, with its performance directly affects the efficiency of the system. Firstly, this study used Monte Carlo ray tracing method to establish a three-dimensional radiation convection coupling model, successfully predicting particle temperature dynamics, and revealing the variation of heat transfer efficiency with direct normal irradiance. Secondly, based on the coupled simulation of discrete element method and computational fluid dynamics, it was found that there is a significant low-speed region near the wall. The research results show that the direct normal irradiance >600W/m², the heat transfer efficiency at 68%, and the optimal flow velocity range was determined through response surface optimization, which can improve the system efficiency by 28%. Finally, in order to verify the accuracy of the model, the outlet temperature of the particles was validated through a single tube free fall experiment. The results showed that the particle outlet temperature significantly increased with the decrease of flow rate, and the max error is 2.52 °C. These findings provide valuable theoretical guidance for the optimization design of tower power stations.

以固体颗粒为传热介质的颗粒接收器被认为是超临界二氧化碳太阳能热发电系统中最关键的能量转换部件，其性能直接影响到系统的效率。首先，利用蒙特卡罗射线追迹法建立了三维辐射对流耦合模型，成功预测了粒子的温度动力学，揭示了传热效率随直接法向辐照度的变化规律。其次，基于离散元法和计算流体力学的耦合模拟，发现壁面附近存在明显的低速区；研究结果表明，在直接法向辐照度为600W/m2时，换热效率为68%，通过响应面优化确定了最佳流速范围，可使系统效率提高28%。最后，为了验证模型的准确性，通过单管自由落体实验验证了颗粒的出口温度。结果表明：随着流量的减小，颗粒出口温度显著升高，最大误差为2.52℃；研究结果为塔式电站的优化设计提供了有价值的理论指导。

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引用次数: 0

Effects of clouds on thermal performance of the receiver in the concentrated solar power tower system 云对聚光太阳能发电塔式系统接收机热性能的影响

IF 9.1 1区工程技术 Q1 ENERGY & FUELS

Renewable Energy

Pub Date : 2026-04-15 Epub Date: 2026-02-06 DOI: 10.1016/j.renene.2026.125396

Zhenjie Wan , Jikang Su , Youda Li , Lin Huang , Yabin Jin , Jinjia Wei

For the concentrated solar power tower system, the cloud cover blocks the heliostats, and the concentrated heat flux fluctuates, resulting in thermal stress and thermal fatigue failure of the receiver. To mitigate the effects of the clouds, a method that could project cloud shadows onto a heliostat field was proposed. Then, we investigated the effects of the cloud shadows on the heliostat field and thermal performance of the receiver. The results indicated that the cloud features had a huge impact on the performance. The concentrated heat flux fluctuated when the cloud shadows varied, bringing challenges to the safe operation of the receiver. With the same shadow ratio, the heliostats blocked might be different, so that the concentrated heat flux distribution varied. The shadow ratio could be used to predict energy production of the receiver under cloudy conditions, but it was not reasonable for evaluating the safe operation of the receiver. The moving cloud cover resulted in fluctuation of the concentrated heat flux, brought risk of thermal fatigue for the tubes. For a shadow ratio reduction of 22.51%, the maximum concentrated heat flux could increase by 343.89%, and the tubes might suffer from severe thermal shock loads. If the transmittance was lower than 0.6, the concentrated heat flux distribution was significantly affected. For the safe operation of the receiver, it is necessary to monitor the cloud features, and an advanced cloud detection method should be developed.

对于聚光太阳能发电塔系统，云层遮挡定日镜，聚光热通量波动，导致接收机热应力和热疲劳失效。为了减轻云层的影响，提出了一种将云层阴影投射到定日镜上的方法。然后，研究了云层阴影对定日镜视场和热性能的影响。结果表明，云特性对性能有很大的影响。当云层阴影变化时，集中热通量会出现波动，给接收机的安全运行带来挑战。在阴影比相同的情况下，被遮挡的定日镜可能不同，从而使集中热通量分布发生变化。阴影比可以用来预测多云条件下接收器的发电量，但对于评估接收器的安全运行并不合理。移动的云量造成了集中热流密度的波动，给管道带来了热疲劳的危险。当阴影比减小22.51%时，最大集中热流密度可增加343.89%，钢管可能遭受严重的热冲击负荷。当透过率低于0.6时，集中热流密度分布受到显著影响。为了接收机的安全运行，有必要对云特征进行监测，并应开发先进的云检测方法。

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引用次数: 0

Evaluating net-zero energy buildings and their grid interaction: A comprehensive framework for operational phase and a Nordic case study 评估净零能耗建筑及其电网相互作用：运营阶段的综合框架和北欧案例研究

IF 9.1 1区工程技术 Q1 ENERGY & FUELS

Renewable Energy

Pub Date : 2026-04-15 Epub Date: 2026-02-12 DOI: 10.1016/j.renene.2026.125435

Matti Aro , Terttu Vainio , Paula Ala-Kotila , Anu Purhonen , Kari Mäki , Pertti Järventausta

This paper presents a synthesized evaluation framework for assessing Net-Zero Energy Buildings (NZEBs) during their operational phase, with a specific focus on grid interaction under real market conditions. The framework integrates four established Key Performance Indicators (KPIs): Load/Generation Balance, Self-Consumption Rate, Emission Reduction Rate and Cost Reduction Rate – using high-resolution operational data, hourly grid emission factors, and spot prices. Demonstrated through a case study of a large Finnish residential NZEB equipped with a ground-source heat pump and off-site solar PV, the analysis reveals both the potential and limitations of PV-based solutions in cold climates. While the system achieved an 89% annual load/generation balance, hourly analysis showed a 31% self-consumption rate, with most PV production exported during periods of low prices and low emissions. Operational emissions and electricity costs were reduced by 56% and 41%, respectively, compared to a baseline without PV. However, sensitivity analysis indicates that economic outcomes are highly dependent on prevailing market conditions, highlighting the importance of multi-year evaluation. The framework's parallel KPIs, when used collectively, enable stakeholders to assess trade-offs and guide practical decisions regarding demand-side management, energy storage, and operational strategies. The economic analysis focuses on market exposure, including O&M costs for PV, but excluding investment costs. The framework is flexible and can be applied to NZEBs with various configurations, supporting robust, data-driven decision-making for improved cost-effectiveness and decarbonization.

本文提出了一个综合评估框架，用于评估净零能耗建筑（nzeb）在其运营阶段，特别关注实际市场条件下的电网相互作用。该框架整合了四个已建立的关键绩效指标（kpi）：负载/发电平衡、自我消耗率、减排率和成本降低率——使用高分辨率运行数据、小时电网排放因子和现货价格。通过对芬兰大型住宅NZEB配备地源热泵和场外太阳能光伏的案例研究，分析揭示了基于光伏的解决方案在寒冷气候下的潜力和局限性。虽然该系统实现了89%的年负荷/发电量平衡，但每小时的分析显示，自耗率为31%，大部分光伏产品在低价格和低排放时期出口。与没有光伏发电的基线相比，运营排放和电力成本分别降低了56%和41%。然而，敏感性分析表明，经济结果高度依赖于当前的市场状况，强调了多年评估的重要性。该框架的并行kpi在共同使用时，使利益相关者能够评估权衡，并指导有关需求侧管理、能源存储和运营战略的实际决策。经济分析侧重于市场风险，包括光伏的运营和管理成本，但不包括投资成本。该框架是灵活的，可以应用于各种配置的nzeb，支持稳健的数据驱动决策，以提高成本效益和脱碳。

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引用次数: 0

Two-stage scenario generation of hydro-wind-solar complementary system based on improved variational autoencoder and generative adversarial networks model 基于改进变分自编码器和生成对抗网络模型的水风光互补系统两阶段情景生成

IF 9.1 1区工程技术 Q1 ENERGY & FUELS

Renewable Energy

Pub Date : 2026-04-15 Epub Date: 2026-02-02 DOI: 10.1016/j.renene.2026.125358

Zhong-kai Feng , Xin Wang , Wen-jing Niu , Jian-bing Li , Jun Zhang , Tao Bai

With the rapid development of new energy technologies, quantifying the spatial-temporal correlation between runoff and wind power and solar power generation capacity and generating representative high-dimensional coupled scenario sets have become urgent issues. As existing methods struggle to generate high-dimensional, long-term reliable scenarios under small sample conditions, this paper proposes a two-stage long-term scenario generation method for runoff-wind-solar integration. In the first stage, it couples generative adversarial network with variational autoencoder, and improves the model by introducing Wasserstein distance and loss weight coefficients to ensure training stability, scenario quality and diversity, and enable initial learning of distribution characteristics from small sample annual data. In the second stage, it incorporates Cholesky decomposition and quantile mapping to enhance the spatial-temporal correlation of scenario sets, thus obtaining highly reliable scenario sets that retain the spatial-temporal features of original data. Validation against scenarios from single-stage VAE-GAN, GAN, VAE and Copula proves the proposed method's effectiveness: in the three-element scenarios, the average absolute error of Kendall correlation coefficient reaches 0.03, 0.02 and 0.04 respectively. This method can provide key technical support for the long-term planning and dispatching of runoff-wind-solar complementary systems.

随着新能源技术的快速发展，量化径流与风电、太阳能发电能力的时空相关性，生成具有代表性的高维耦合情景集已成为亟待解决的问题。由于现有方法难以在小样本条件下生成高维、长期可靠的情景，本文提出了一种两阶段的径流-风能-太阳能一体化长期情景生成方法。在第一阶段，将生成对抗网络与变分自编码器耦合，通过引入Wasserstein距离系数和损失权系数对模型进行改进，以保证训练的稳定性、场景质量和多样性，并能够从小样本年度数据中初始学习分布特征。第二阶段，结合Cholesky分解和分位数映射，增强场景集的时空相关性，获得保留原始数据时空特征的高可靠场景集。对单阶段VAE-GAN、GAN、VAE和Copula场景的验证证明了所提出方法的有效性：在三元场景下，Kendall相关系数的平均绝对误差分别达到0.03、0.02和0.04。该方法可为径流-风能-太阳能互补系统的长期规划和调度提供关键技术支持。

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引用次数: 0

Experimental study on space heating performance of PVT-air dual heat source direct expansion heat pump system based on micro heat pipe arrays 基于微热管阵列的pvt -空气双热源直扩热泵系统空间采暖性能实验研究

IF 9.1 1区工程技术 Q1 ENERGY & FUELS

Renewable Energy

Pub Date : 2026-04-15 Epub Date: 2026-02-02 DOI: 10.1016/j.renene.2026.125383

Ze Bai , Yaohua Zhao , Zhenhua Quan , Haibo Ren , Chenyang Du

To address the growing demand for efficient and renewable heating, a novel dual source direct expansion PVT-air heat pump system integrating a PVT-air evaporator based on micro heat pipe arrays is proposed. This design overcomes limitations of conventional flat-plate PVT evaporators, such as high-pressure loss, low solar energy utilization and unstable system energy supply. The system was experimentally evaluated under winter space heating conditions. Results showed a maximum thermal efficiency of 35%, power generation efficiency of 17%, COP of 3.52, and exergy efficiency of 21% under average solar irradiance of 654 W/m², ambient temperature of 5.1 °C, and wind speed of 2.6 m/s. COP increased by up to 12.5% and exergy efficiency by 43.4% per 100 W/m² rise in solar irradiance, while a 5 K rise in load water temperature reduced COP by 8.4% and exergy efficiency by 4.7%. The system demonstrated stable switching between solar and air heat sources. Compared to the conventional tube-and-sheet PVT direct expansion heat pump, the proposed system achieved 4.5%, 33.5%, and 20% improvements in COP, power generation efficiency, and COP_PVT, respectively. The dimensionless pressure loss of the PVT-air evaporator based on micro heat pipe arrays was also 87% lower than that of the fin-tube heat exchanger. These results confirm the system's excellent performance, reliability, and potential for practical heating applications.

为了满足日益增长的高效可再生供暖需求，提出了一种新型的双源直接膨胀式pvt -空气热泵系统，该系统集成了基于微热管阵列的pvt -空气蒸发器。本设计克服了传统平板PVT蒸发器高压损耗、太阳能利用率低、系统供能不稳定等缺点。在冬季空间采暖条件下对该系统进行了实验评估。结果表明，在平均太阳辐照度为654 W/m2、环境温度为5.1℃、风速为2.6 m/s的条件下，该电站最大热效率为35%，发电效率为17%，COP为3.52，火用效率为21%。太阳辐照度每增加100 W/m2， COP提高12.5%，火用效率提高43.4%，而负荷水温每增加5 K， COP降低8.4%，火用效率降低4.7%。该系统在太阳能和空气热源之间进行了稳定的切换。与传统管板式PVT直接膨胀热泵相比，该系统的COP、发电效率和COPPVT分别提高了4.5%、33.5%和20%。基于微热管阵列的pvt -空气蒸发器的无因次压力损失也比翅片管换热器低87%。这些结果证实了该系统的优异性能、可靠性和实际加热应用的潜力。

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引用次数: 0