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Green restaurants: An economic assessment of solar photovoltaics and energy storage systems 绿色餐厅:太阳能光伏和能源储存系统的经济评估
IF 9.5 Q1 ENERGY & FUELS Pub Date : 2025-12-09 DOI: 10.1016/j.nexus.2025.100612
Idiano D'Adamo , Simone Di Leo , Massimo Gastaldi , Anna Chiara Maccallini
The transition to sustainable business models in the catering sector requires the integration of environmental innovation with economic feasibility. Restaurants, as energy-intensive businesses, represent a strategic context for assessing the financial viability of renewable energy technologies. This study evaluates the economic viability of photovoltaic (PV) and battery energy storage (BES) systems in Italy. The analysis evaluates the project under different policy conditions, with and without public incentives (40 % capital deduction on investment costs), and identifies the key factors that influence their profitability. A comprehensive methodology combining financial and sensitivity analysis, scenario analysis, LASSO regression, break-even point and Monte Carlo simulations was applied to assess economic performance and risk. The results show that the PV system is profitable in both contexts, although incentives significantly improve returns: from 425 to 1590 €/kW. Profitability depends mainly on specific production, the cost of purchasing electricity and the percentage of self-consumption. For the BES, profitability only occurs when self-consumption increases by at least 22–25 % with incentives and 30–35 % without them. Overall, the results emphasise that policy support and management strategies to optimise self-consumption are key to ensuring financial profitability. This work enables restaurant owners to identify the variables that most strongly influence the final outcome, helping them mitigate risks and maximise returns, while supporting more informed decisions that contribute to long-term sustainable development.
餐饮业向可持续商业模式的过渡需要将环境创新与经济可行性相结合。餐馆作为能源密集型企业,代表了评估可再生能源技术财务可行性的战略背景。本研究评估了意大利光伏(PV)和电池储能(BES)系统的经济可行性。该分析评估了不同政策条件下的项目,有和没有公共激励(40%的投资成本资本扣除),并确定了影响其盈利能力的关键因素。综合财务和敏感性分析、情景分析、LASSO回归、盈亏平衡点和蒙特卡罗模拟的综合方法被应用于评估经济绩效和风险。结果表明,在这两种情况下,光伏系统都是有利可图的,尽管激励措施显著提高了回报:从425欧元/千瓦到1590欧元/千瓦。盈利能力主要取决于具体产量、购电成本和自用比例。对于BES来说,只有当自我消费在有激励的情况下增加至少22 - 25%,而在没有激励的情况下增加30 - 35%时,才能实现盈利。总体而言,研究结果强调,优化自我消费的政策支持和管理策略是确保财务盈利能力的关键。这项工作使餐馆老板能够识别对最终结果影响最大的变量,帮助他们降低风险并实现回报最大化,同时支持更明智的决策,有助于长期可持续发展。
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引用次数: 0
Pathways to feasible hydrogen production in alkaline water electrolyzers 可行的碱性水电解槽制氢途径
IF 9.5 Q1 ENERGY & FUELS Pub Date : 2025-12-09 DOI: 10.1016/j.nexus.2025.100620
Adnan Ozden
Renewable-electricity-powered hydrogen production via alkaline water electrolysis provides an efficient route to hydrogen economy. Recent advances in catalysts, membranes, and systems have enhanced the technology’s practicality. This work provides a techno-economic assessment of hydrogen production, offering scenarios that needs to be met toward wide-scale industrial implementation. The work explores the cost implications of critical performance metrics and parameters, including current density, cell voltage, Faradaic efficiency (FE), electricity and water prices, catalyst/membrane and system lifetimes, and electrolyzer cost. The study reveals 15 scenarios that could take the technology a step closer to the DOE’s hydrogen cost targets. The analysis reveals that the economically compelling production of hydrogen requires performance enhancements (particularly voltage reductions), along with lower electricity (<3.6 c kWh−1) and water (<3 $ ton−1) prices, longer catalyst/membrane lifetimes (>13,140 hours), electrolyzer costs (<200 kW−1), and catalyst/membrane costs (<5% of total electrolyzer capital). The work discusses the remaining technical and economic challenges, offering research directions toward marketable electrified hydrogen production.
通过碱性电解水的可再生电力制氢为氢经济提供了一条有效途径。催化剂、膜和系统的最新进展提高了该技术的实用性。这项工作提供了氢生产的技术经济评估,提供了需要满足大规模工业实施的方案。这项工作探讨了关键性能指标和参数的成本影响,包括电流密度、电池电压、法拉第效率(FE)、电价和水价、催化剂/膜和系统寿命以及电解槽成本。该研究揭示了15种情况,可以使该技术更接近美国能源部的氢成本目标。分析显示,经济上引人注目的氢气生产需要性能增强(特别是降低电压),同时降低电力(<;3.6℃千瓦时−1)和水(<;3美元吨−1)价格,延长催化剂/膜寿命(>13,140小时),电解槽成本(<;200千瓦−1),催化剂/膜成本(<;占电解槽总资本的5%)。这项工作讨论了剩余的技术和经济挑战,为市场化的电气化氢生产提供了研究方向。
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引用次数: 0
Mitigating the water scarcity challenges by a novel Dual Stage Water Purifier Unit-An experimental study 新型双级净水器缓解水资源短缺挑战的实验研究
IF 9.5 Q1 ENERGY & FUELS Pub Date : 2025-12-09 DOI: 10.1016/j.nexus.2025.100614
Sampath Suranjan Salins , Sawan Shetty , Shiva Kumar , Reema Shetty
This study presents the development of a dual-stage water purification system for the treatment of grey water (GW) and saline water (SW). In the first stage, water was passed through a graded series of filtration layers arranged from coarse to fine, while the second stage employed organic packing materials—Celdek (C), coconut coir (CC), and wood shavings (WS)—to further enhance purification and humidification. Water quality was evaluated at multiple stages, with the system achieving optimum performance of 0.27 LPM production rate, 19% efficiency, and a specific filtration capacity of 265 LPM/m² when operated with saline water and Celdek packing. Results indicated that water production increased during the initial six minutes before stabilizing, with the first stage accounting for the greatest removal of impurities relative to the second. Across both stages, reductions were observed in total dissolved solids (29%), hardness (58%), chloride (50%), and sulphate (33.3%). Overall, the dual-stage water filtration–humidification unit demonstrated strong efficacy in treating both grey and saline water, delivering potable water that complies with EPA standards.
本研究介绍了一种用于处理灰水(GW)和咸水(SW)的双级水净化系统的开发。在第一阶段,水通过一系列从粗到细的分级过滤层,而第二阶段使用有机包装材料- celdek (C),椰子椰子(CC)和木屑(WS) -进一步加强净化和加湿。在多个阶段对水质进行了评估,当使用盐水和Celdek填料时,系统的最佳性能为0.27 LPM的产率,19%的效率,265 LPM/m²的比过滤能力。结果表明,在稳定之前的最初6分钟内,产水量增加,相对于第二阶段,第一阶段的杂质去除量最大。在这两个阶段,观察到总溶解固形物(29%)、硬度(58%)、氯化物(50%)和硫酸盐(33.3%)的降低。总体而言,双级水过滤加湿装置在处理灰水和盐水方面表现出强大的功效,提供符合EPA标准的饮用水。
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引用次数: 0
Harnessing the future of renewable energy: Integrated insights of ocean energy 利用可再生能源的未来:海洋能源的综合见解
IF 9.5 Q1 ENERGY & FUELS Pub Date : 2025-12-09 DOI: 10.1016/j.nexus.2025.100622
G. Shyamala , Gobinath Ravindran , George Uwadiegwu Alaneme , Ramesh T , Sukumar Dhanapalan
Recently, energy consumption has increased, necessitating higher energy production through various sources. Renewable sources such as solar, wind, and hydroelectric power can complement this demand. Hydropower through surface water can generate sufficient electricity, but their output will be significantly lower than that of the ocean-based energy production. The ocean, a powerful energy source, surpasses other renewables, but requires effective implementation and scaling to reduce carbon emissions and spur economic growth. The challenges include technological maturity, funding, market creation, regulatory issues, environmental concerns, and grid integration. This bibliometric study analyzes trends in citations and publications from 2009 to 2024 using Power BI statistical assessment and text mining tools, including bibliographic coupling of documents, sources, and authors, to explore current and emerging trends in ocean energy. In this study we have adopted a three year block period for analysis. This study investigated ocean energy cost efficiency, wave prediction, extreme weather impacts, and contributions to global electricity for sustainability, observing minor growth in ocean surface kinetic energy and significant increases in potential energy due to sea level rise, while also assessing the efficiency, mechanisms, and challenges of ocean kinetic energy harvesters for marine sensors. Large-scale deployment of ocean energy necessitates careful site selection and research to mitigate the environmental impacts on marine ecosystems and ocean-atmosphere interactions, ensuring sustainable development. Advancing reliable and cost-effective technologies, such as WECs, OTECs, and tidal energy, while overcoming the challenges of biofouling, corrosion, and scaling, is crucial for the future of ocean energy and it’s widespread commercial sustainability.
最近,能源消耗增加,需要通过各种途径提高能源产量。太阳能、风能和水力发电等可再生能源可以补充这一需求。通过地表水发电可以产生足够的电力,但其发电量将明显低于基于海洋的能源生产。海洋是一种强大的能源来源,超过其他可再生能源,但需要有效实施和扩大规模,以减少碳排放并刺激经济增长。挑战包括技术成熟度、资金、市场创造、监管问题、环境问题和电网整合。本文献计量学研究使用Power BI统计评估和文本挖掘工具,分析了2009年至2024年的引文和出版物趋势,包括文献、来源和作者的书目耦合,以探索当前和新兴的海洋能源趋势。在这项研究中,我们采用了三年的块期进行分析。本研究调查了海洋能源的成本效率、海浪预测、极端天气影响以及对全球电力可持续发展的贡献,观察了海平面上升导致的海洋表面动能的小幅增长和势能的显著增加,同时还评估了用于海洋传感器的海洋动能收集器的效率、机制和挑战。大规模部署海洋能需要仔细的选址和研究,以减轻对海洋生态系统和海洋-大气相互作用的环境影响,确保可持续发展。推进可靠且具有成本效益的技术,如WECs、otec和潮汐能,同时克服生物污染、腐蚀和结垢的挑战,对海洋能源的未来及其广泛的商业可持续性至关重要。
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引用次数: 0
Controlled autoxidation of HVGO to produce high-value carbon fibers precursors: the role of oxygen availability and naphthenic-aromatic hydrocarbons HVGO受控自氧化生产高价值碳纤维前体:氧可用性和环烷基芳烃的作用
IF 9.5 Q1 ENERGY & FUELS Pub Date : 2025-12-09 DOI: 10.1016/j.nexus.2025.100623
Mustafa M. Amin , Ajay Sharma , Mohammad M. Hossain , Muhammad N. Siddiquee
This study investigated the application of heavy vacuum gas oil (HVGO) as a feedstock for high-value carbon fiber precursor production through controlled autoxidation. HVGO, initially had no asphaltenes, was subjected to varying oxidation conditions, such as blowing without mixing and bubbling with mixing at different temperatures with and without addition of tetralin (a naphthenic-aromatic hydrocarbon), to enhance its asphaltenes content and modify its physicochemical properties required for carbon fiber formation. The elemental analysis and physicochemical characterization of the HVGO samples after oxidation showed that the autoxidation significantly enhanced the asphaltenes content, with the highest asphaltenes yield of 47.2 wt. %, viscosity of 117.6 Pa.s, and softening point of 210 °C achieved after 72 hours at 190°C using 5% tetralin and air blowing without mixing. It also found that tetralin addition maintaining limited oxygen conditions would help to form heavier products, desirable as carbon fiber precursor. The melt spinning of the asphaltenes from oxidized HVGO with tetralin, provided green fibers with diameters of 70 µm and carbonized fibers with diameters of 40 to 50 µm, as detected by SEM imaging analysis. The mass residues of the oxidized HVGO samples and the carbon fibers were confirmed by TGA analysis. All these observations indicated that the controlled autoxidation, especially when tetralin was added, was a potential pathway to turn low-value HVGO into high-value carbon fiber precursors. Understanding the current research can also be applied to produce high-value carbon materials for CNT, graphene, and carbon materials for energy storage applications.
研究了重真空瓦斯油(HVGO)作为原料,通过控制自氧化生产高价值碳纤维前驱体的应用。HVGO最初不含沥青质,在不同的氧化条件下,如不混合吹气和在不同温度下混合鼓泡,添加和不添加四氢萘(一种环芳烃),以提高其沥青质含量并改变其形成碳纤维所需的物理化学性质。氧化后的HVGO样品的元素分析和理化表征表明,自氧化显著提高了沥青质含量,沥青质收率最高为47.2%,粘度为117.6 Pa。5,在190℃下,用5%四氢化萘和不混合的空气吹72小时,软化点达到210℃。它还发现,四氢化萘的添加维持有限的氧气条件,将有助于形成较重的产品,理想的碳纤维前体。通过扫描电镜成像分析,四氢化萘熔融纺丝得到直径为70µm的绿色纤维和直径为40 ~ 50µm的碳化纤维。氧化后的HVGO样品和碳纤维的质量残留物通过TGA分析得到了证实。所有这些观察结果表明,控制自氧化,特别是当添加四氢化萘时,是将低价值HVGO转化为高价值碳纤维前体的潜在途径。了解目前的研究还可以应用于生产用于碳纳米管,石墨烯和用于储能应用的碳材料的高价值碳材料。
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引用次数: 0
Optimization design and techno-economic assessment of integrated solar photovoltaic thermal systems for modern agricultural greenhouses 现代农业大棚太阳能光伏一体化热系统优化设计及技术经济评价
IF 9.5 Q1 ENERGY & FUELS Pub Date : 2025-12-09 DOI: 10.1016/j.nexus.2025.100627
Yitong Liu , Chao Zhou , Ahmad Riaz
Amid intensifying global climate change and a deepening energy crisis, the high energy consumption of agricultural greenhouses has become increasingly problematic. To address this issue and enhance environmental control within modern agricultural greenhouses, this study proposes an optimized design for a solar photovoltaic thermal (PVT) integrated system tailored for northern solar greenhouses. This design aims to achieve greenhouse energy self-sufficiency and promote sustainable agricultural development. The study outlines a system optimization methodology and a PVT unit layout strategy. This strategy includes double-sided placement on both interior and exterior surfaces of the bilateral gable walls, the use of adjustable racks on the rear wall, and the configuration of an internal heat dissipation system within the greenhouse. These measures collectively enhance the system's year-round comprehensive energy utilization efficiency. Using a typical solar greenhouse case in Shouguang City, Shandong Province, a system performance evaluation model is established. Theoretical analysis indicates that the system generates 35,422 kWh of electricity and 208,945 MJ of heat annually. This achieves an electrical energy self-sufficiency rate of 130.9 % and a thermal energy self-sufficiency rate of 139.4 %, effectively resolving the seasonal mismatch between energy supply and demand in the greenhouse. Comprehensive techno-economic analysis shows a total system investment of approximately CNY 172,300. The static investment payback period is 6.25 years, while accounting for equipment performance degradation yields a dynamic payback period of 9.1 years and an internal rate of return (IRR) of 10.6 %, demonstrating sound economic feasibility. Sensitivity analysis identifies initial investment costs and electricity price fluctuations as key factors influencing system economics. Environmental benefit assessment reveals that the system can displace 17.4 tons of standard coal annually, reducing CO₂ emissions by approximately 45.5 tons. Over a projected 25-year operational lifespan, cumulative CO₂ emission reductions are estimated at approximately 1139 tons. This study provides a technically viable, economically feasible, and environmentally friendly solution to the high energy consumption challenge of agricultural greenhouses, demonstrating significant practical value for advancing sustainable agriculture and optimizing energy structures.
随着全球气候变化的加剧和能源危机的加深,农业大棚的高能耗问题日益突出。为了解决这一问题,加强现代农业大棚的环境控制,本研究提出了一种针对北方太阳能大棚的太阳能光伏热(PVT)集成系统的优化设计。本设计旨在实现温室能源自给,促进农业可持续发展。该研究概述了系统优化方法和PVT单元布局策略。该策略包括在两侧山墙的内外两面放置,在后墙上使用可调节的机架,以及在温室内配置内部散热系统。这些措施共同提高了系统全年的综合能源利用效率。以山东省寿光市日光温室为例,建立了系统性能评价模型。理论分析表明,该系统年发电量35422千瓦时,年发热量208945兆焦耳。实现了电能自给率130.9%、热能自给率139.4%,有效解决了温室能源供需季节性不匹配的问题。综合技术经济分析,系统总投资约17.23万元。静态投资回收期为6.25年,而考虑设备性能退化的动态投资回收期为9.1年,内部收益率(IRR)为10.6%,证明了良好的经济可行性。敏感性分析表明,初始投资成本和电价波动是影响系统经济性的关键因素。环境效益评价结果显示,该系统每年可替代17.4吨标准煤,减少二氧化碳排放量约45.5吨。在预计的25年运行寿命中,累计减少的CO₂排放量估计约为1139吨。本研究为农业大棚高能耗挑战提供了技术上可行、经济上可行、环境友好的解决方案,对推进农业可持续发展和优化能源结构具有重要的实用价值。
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引用次数: 0
Water-energy nexus: Integrating hydrochemical characterization and life cycle assessment for a holistic profile of agricultural groundwater sustainability 水-能源关系:综合水化学特征和生命周期评估,以实现农业地下水可持续性的整体概况
IF 9.5 Q1 ENERGY & FUELS Pub Date : 2025-12-09 DOI: 10.1016/j.nexus.2025.100616
Naseem Akhtar , Syahidah Akmal Muhammad , Muhammad Izzuddin Syakir , Hamza Mohamed Flafel , Pahmi Husain , Sulgiye Park , Faisal M. Alfaisal , Shamshad Alam
Sustainable groundwater management is critically hampered by a disconnect between water quality assessment and environmental impact (EI) of its extraction infrastructure, particularly at the micro-level. This study applied a novel micro-nexus lens to bridge this gap by developing a holistic sustainability profile for a single agricultural pumping well in Labu Kubong, Malaysia. The objectives were outlined as follows: (i) to characterize hydrochemical properties and evaluate groundwater suitability for paddy irrigation utilizing Piper, Gibbs, Wilcox, and United States Salinity Laboratory (USSL) diagrams; (ii) to pinpoint dominant environmental hotspots from raw materials and energy consumption using a cradle-to-gate Life Cycle Assessment (LCA); (iii) to validate LCA reliability with Monte Carlo uncertainty analysis; and (iv) to synthesize the hydrochemical and LCA results into a holistic sustainability balance sheet (HSBS). The Piper diagram results indicated calcium-magnesium-bicarbonate-type water, with rock weathering identified as the predominant geochemical process by the Gibbs diagram. The groundwater was classified as excellent for irrigation (C2-S1 class) by Wilcox and USSL diagrams. Counter-intuitively, LCA revealed that dominant EI originated not from operational energy consumption (1.65 %) but from the embodied footprint of the raw materials from groundwater extraction infrastructure. Raw material production, particularly polyethylene terephthalate (61.6 %), copper for the submersible pump (14.8 %), gravel packing (4.51 %), steel (3.5 %), copper wire for the electrical cable (2.05 %), polyvinyl chloride (1.12 %), and high-density polyethylene (0.0062 %), were the primary contributors. This integrated micro-nexus paradigm offers HSBS, highlighting a significant paradox whereby intrinsic groundwater suitability for paddy agriculture and unsuitability for drinking without treatment due to elevated concentrations of iron (1.71 mg/L), manganese (0.173 mg/L), and arsenic (0.04 mg/L) occur alongside significant extrinsic EI resulting from its extraction infrastructure. This HSBS provides policymakers a crucial tool for integrated management decisions, enabling balanced consideration of usability, operational risk, and life cycle impacts to support truly sustainable groundwater management.
特别是在微观层面上,水质评估与抽取基础设施的环境影响(EI)之间的脱节严重阻碍了可持续地下水管理。本研究通过为马来西亚Labu Kubong的一个农业抽水井开发一个整体的可持续性概况,应用了一种新型的微连接透镜来弥合这一差距。目标概述如下:(i)利用Piper, Gibbs, Wilcox和美国盐度实验室(USSL)图表表征水化学特性并评估地下水对水稻灌溉的适用性;(ii)利用从摇篮到闸门的生命周期评估(LCA),找出主要的环境热点,包括原材料和能源消耗;(iii)利用蒙特卡罗不确定性分析验证LCA的可靠性;(iv)将水化学和LCA结果综合成一个整体的可持续性资产负债表(HSBS)。Piper图结果显示为钙-镁-碳酸氢盐型水,Gibbs图确定岩石风化为主要的地球化学过程。根据Wilcox图和USSL图,地下水被划分为优秀灌溉(C2-S1级)。与直觉相反,LCA显示,主要的EI不是来自运营能源消耗(1.65%),而是来自地下水开采基础设施中原材料的隐含足迹。原材料生产,特别是聚对苯二甲酸乙二醇酯(61.6%)、潜水泵用铜(14.8%)、砾石填料(4.51%)、钢(3.5%)、电缆用铜线(2.05%)、聚氯乙烯(1.12%)和高密度聚乙烯(0.0062%)是主要贡献者。这种集成的微联系模式提供了HSBS,突出了一个重要的悖论,即地下水固有的适合水稻田农业和不适合饮用,因为铁(1.71 mg/L)、锰(0.173 mg/L)和砷(0.04 mg/L)的浓度升高,与提取基础设施产生的显著外在EI同时发生。HSBS为决策者提供了综合管理决策的重要工具,能够平衡考虑可用性、操作风险和生命周期影响,以支持真正可持续的地下水管理。
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引用次数: 0
Optimizing energy efficiency and legionella control in hot water circulation systems: laboratory validation and field assessment in Swedish multifamily buildings 优化能源效率和军团菌控制在热水循环系统:实验室验证和现场评估在瑞典多户建筑
IF 9.5 Q1 ENERGY & FUELS Pub Date : 2025-12-09 DOI: 10.1016/j.nexus.2025.100613
Jesper Knutsson , Jörgen Wallin
Hot water circulation (HWC) systems in multifamily buildings face a fundamental trade-off: maintaining temperatures sufficient to suppress Legionella pneumophila (≥50 °C) while minimizing the 2.5–4.3 TWh annual energy loss these systems represent in Sweden alone. This study employed a novel dual approach combining controlled laboratory experiments with real-world validation to address this challenge. We constructed a full-scale test rig simulating a 20-apartment building to quantify thermal losses and microbial dynamics under varying flow rates and temperatures. This was complemented by a field validation encompassing 56 water samples from 31 multifamily buildings. The results demonstrate that when optimizing the system to maintain a regulatory required return temperature of 50  °C, thermal heat losses were nearly identical between low-flow (0.2 m/s) and high-flow (0.5 m/s) operation. The decisive factor was pump energy, where high-flow operation required 3.4 times more power than low-flow operation (108 W vs. 32 W). This resulted in a total annual energy saving of approximately 12% for the low-flow strategy, entirely attributable to reduced electricity consumption for the pump. Periodic thermal shocks at 60–65 °C effectively reduced L. pneumophila concentrations, indicating that continuous high-temperature operation is not required for microbial control. Field sampling revealed that 23% of samples tested positive for legionella, with problematic cases strongly linked to design flaws like towel warmers connected to the HWC loop. These findings indicate that a risk-based strategy combining low-flow circulation (0.2 m/s), a baseline return temperature of 50 °C, and periodic thermal shocks can significantly reduce system energy consumption while maintaining legionella safety.
多户建筑中的热水循环(HWC)系统面临着一个基本的权衡:保持足够的温度来抑制嗜肺军团菌(≥50°C),同时最大限度地减少这些系统仅在瑞典就代表的2.5-4.3太瓦时的年能量损失。本研究采用了一种新颖的双重方法,将实验室控制实验与现实世界验证相结合,以解决这一挑战。我们建造了一个模拟20栋公寓建筑的全尺寸测试平台,以量化在不同流速和温度下的热损失和微生物动力学。此外,还对来自31座多户住宅的56个水样进行了实地验证。结果表明,当优化系统以保持调节所需的回流温度为50°C时,低流量(0.2 m/s)和高流量(0.5 m/s)运行时的热损失几乎相同。决定性因素是泵的能量,大流量作业所需的功率是小流量作业所需功率的3.4倍(108 W对32 W)。这使得低流量策略每年节省约12%的能源,完全归功于减少了泵的电力消耗。60-65°C的周期性热冲击有效降低了嗜肺乳杆菌的浓度,表明不需要连续的高温操作来控制微生物。现场抽样显示,23%的样本检测出军团菌阳性,问题病例与设计缺陷密切相关,如与HWC回路相连的毛巾加热器。这些发现表明,基于风险的策略结合低流量循环(0.2 m/s)、50°C的基线返回温度和周期性热冲击可以显著降低系统能耗,同时保持军团菌的安全。
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引用次数: 0
Evaluating year-round solar energy harvesting in semi-transparent PV-integrated greenhouses with roof and wall installation in an even-span design 评估半透明光伏集成温室全年太阳能收集,屋顶和墙壁采用均匀跨设计
IF 9.5 Q1 ENERGY & FUELS Pub Date : 2025-12-09 DOI: 10.1016/j.nexus.2025.100617
Mohammadreza Gholami , Sobhan Dorahaki , Mohammad Habib Reza , Lazhar Ben-Brahim , S M Muyeen
Given the global drive toward sustainable agricultural practices, semi-transparent photovoltaic (STPV) technology offers a dual benefit of generating renewable energy while still permitting a portion of sunlight essential for plant growth. Unlike traditional photovoltaic installations limited to roof surfaces, this work investigates the innovative use of STPV panels on vertical wall surfaces to maximize solar harvesting. By conducting an hourly irradiance analysis for a full calendar year, we evaluated the solar energy potential of different greenhouse sections (roof and walls) in Qatar's climatic conditions. The results reveal a significant contribution from wall-mounted STPV installations, which generated 83.77 % of the total annual energy compared to roof-mounted systems. Among the walls, the East Wall (EW) contributed consistently, achieving an annual average of 0.35 kWh/m², while the South Wall (SW) and West Wall (WW) also provided meaningful outputs of 0.19 kWh/m² and 0.22 kWh/m² respectively. In contrast, the North Roof (NR) and North Wall (NW) sections demonstrated the lowest energy outputs, with annual averages of 0.01 kWh/m² and 0.05 kWh/m², underscoring limited solar access due to their orientation. Sensitivity analysis further indicated that panel efficiency plays a crucial role in energy generation, with potential production reaching 18,904 kWh annually at a 20 % efficiency rate, significantly higher than the baseline 7 % efficiency considered in this study.
鉴于全球对可持续农业实践的推动,半透明光伏(STPV)技术提供了产生可再生能源的双重好处,同时仍然允许植物生长所必需的部分阳光。与局限于屋顶表面的传统光伏装置不同,这项工作研究了在垂直墙面上创新性地使用STPV板,以最大限度地收集太阳能。通过对整个日历年的每小时辐照度进行分析,我们评估了卡塔尔气候条件下不同温室部分(屋顶和墙壁)的太阳能潜力。结果显示,壁挂式STPV装置的贡献很大,与屋顶安装系统相比,它产生了83.77%的年总能量。在这些墙中,东墙(EW)贡献稳定,年平均发电量为0.35 kWh/m²,而南墙(SW)和西墙(WW)也提供了可观的发电量,分别为0.19 kWh/m²和0.22 kWh/m²。相比之下,北屋顶(NR)和北墙(NW)部分显示出最低的能量输出,年平均为0.01 kWh/m²和0.05 kWh/m²,强调了由于其朝向而限制的太阳能接入。敏感性分析进一步表明,面板效率在能源生产中起着至关重要的作用,在20%的效率下,每年的潜在产量将达到18904千瓦时,显著高于本研究中考虑的7%的基准效率。
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引用次数: 0
Assessing water resources availability and crop performance under climate change in Kenya's Bura irrigation scheme using SWAT and AquaCrop 利用SWAT和AquaCrop评估气候变化下肯尼亚Bura灌溉计划的水资源可用性和作物性能
IF 9.5 Q1 ENERGY & FUELS Pub Date : 2025-12-09 DOI: 10.1016/j.nexus.2025.100624
Daniel Mwendwa Wambua , Hiroaki Somura , Toshitsugu Moroizumi , Morihiro Maeda
The current study focused on Tana River Basin in Kenya, home to the Bura irrigation scheme (BIS). The BIS faces water supply shortages during critical months of crop development. This study aimed to evaluate the available water resources and crop performance using the Soil and Water Assessment Tool (SWAT) and AquaCrop, respectively, under historical and future shared socioeconomic pathways (SSPs) at the BIS. SWAT estimated the total available flows (TAF) at the BIS intake, whereas AquaCrop estimated crop water requirements (CWR), yields, and water productivity (Wpet) of rice and maize at various carbon (IV) oxide (CO2) levels. The study suggested that the TAF will remain relatively low during the early critical crop development stages in the main cropping season, August-October. Maize yields remained steady over the two cropping seasons under both constant and elevated CO2 levels in the historical and future periods, as opposed to those of rice. Elevated CO2 levels led to diminishing CWR. Moreover, rice showed a stronger response to elevated CO2 than maize. As a result, maize which is less affected by variations in CO2 and temperatures and has less crop water requirements will be better suited than rice for cultivation in the BIS under climate change. To ensure a sustainable water supply in the scheme, the government should increase rainwater harvesting during periods of high TAF. Moreover, there should be a focus on introducing crops that are tolerant to water and temperature stresses and that can reap the most from the elevated CO2 levels.
目前的研究集中在肯尼亚的塔纳河流域,这里是Bura灌溉计划(BIS)的所在地。在作物生长的关键月份,BIS面临着供水短缺的问题。本研究旨在利用土壤和水分评估工具(SWAT)和AquaCrop分别评估BIS历史和未来共享社会经济路径(ssp)下的可用水资源和作物生产性能。SWAT估计了BIS摄入量的总可用流量(TAF),而AquaCrop估计了水稻和玉米在不同碳(IV)氧化物(CO2)水平下的作物需水量(CWR)、产量和水分生产力(Wpet)。该研究表明,在8 - 10月主要种植季节的早期关键作物发育阶段,TAF将保持相对较低的水平。与水稻不同,在过去和未来两个时期,在二氧化碳水平不变和升高的情况下,玉米产量在两个种植季节保持稳定。二氧化碳浓度升高导致CWR减小。此外,水稻对二氧化碳浓度升高的响应强于玉米。因此,受二氧化碳和温度变化影响较小、作物需水量较少的玉米将比水稻更适合在气候变化条件下在BIS种植。为确保该计划的可持续供水,政府应在TAF高期间增加雨水收集。此外,应该把重点放在引进能够耐受水和温度压力的作物上,这些作物可以从升高的二氧化碳水平中收获最多。
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Energy nexus
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