Renewable Energy最新文献

英文中文

Experimental investigation of heat pipe thermoelectric system under dynamic heat sources

IF 9 1区工程技术 Q1 ENERGY & FUELS

Renewable Energy

Pub Date : 2025-03-03 DOI: 10.1016/j.renene.2025.122796

Yulong Zhao , Yao Qin , Ao Zuo , Wenjie Li , Liyao Xie , Wei Wang , Domagoj Vulin , Yulin Wang , Minghui Ge

Heat pipe thermoelectric systems utilize heat pipes to regulate the heat flux at the hot and cold ends of the thermoelectric module, thereby increasing overall generator thermoelectric conversion efficiency. Fluctuations in heat sources can impact the thermoelectric performance of a thermoelectric system. This study constructs an experimental system for heat pipe thermoelectric systems to explore its thermoelectric characteristics under dynamic heat sources. The results demonstrate that dynamic heat sources introduce fluctuations in the thermoelectric performance. However, once the system reaches dynamic equilibrium, the peak and valley output powers of the system remain relatively stable. When an average heat source power of 80 W is considered, the utilization of dynamic heat sources leads to a 15.30 % improvement in the average output power compared with that of steady-state heat sources. Furthermore, as the heat source cycling period increases to 360 min, the average thermoelectric efficiency reaches 2.71 %, and the output power can be improved by 122.43 %. Moreover, a higher fluctuation magnitude of heat source power correlates with a greater enhancement in the thermoelectric performance. The findings of this study offer valuable insights for achieving efficient operation in thermoelectric systems.

{"title":"Experimental investigation of heat pipe thermoelectric system under dynamic heat sources","authors":"Yulong Zhao , Yao Qin , Ao Zuo , Wenjie Li , Liyao Xie , Wei Wang , Domagoj Vulin , Yulin Wang , Minghui Ge","doi":"10.1016/j.renene.2025.122796","DOIUrl":"10.1016/j.renene.2025.122796","url":null,"abstract":"<div><div>Heat pipe thermoelectric systems utilize heat pipes to regulate the heat flux at the hot and cold ends of the thermoelectric module, thereby increasing overall generator thermoelectric conversion efficiency. Fluctuations in heat sources can impact the thermoelectric performance of a thermoelectric system. This study constructs an experimental system for heat pipe thermoelectric systems to explore its thermoelectric characteristics under dynamic heat sources. The results demonstrate that dynamic heat sources introduce fluctuations in the thermoelectric performance. However, once the system reaches dynamic equilibrium, the peak and valley output powers of the system remain relatively stable. When an average heat source power of 80 W is considered, the utilization of dynamic heat sources leads to a 15.30 % improvement in the average output power compared with that of steady-state heat sources. Furthermore, as the heat source cycling period increases to 360 min, the average thermoelectric efficiency reaches 2.71 %, and the output power can be improved by 122.43 %. Moreover, a higher fluctuation magnitude of heat source power correlates with a greater enhancement in the thermoelectric performance. The findings of this study offer valuable insights for achieving efficient operation in thermoelectric systems.</div></div>","PeriodicalId":419,"journal":{"name":"Renewable Energy","volume":"245 ","pages":"Article 122796"},"PeriodicalIF":9.0,"publicationDate":"2025-03-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143562440","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Hybrid molecular fuzzy recommender systems for impact of climate change on renewable energy performance

IF 9 1区工程技术 Q1 ENERGY & FUELS

Renewable Energy

Pub Date : 2025-03-03 DOI: 10.1016/j.renene.2025.122799

Yedan Shen , Wei Liu , Hasan Dinçer , Serhat Yüksel

The purpose of this study is to identify the most convenient strategies to manage the negative impacts of climate change on renewable energy projects effectively. Missing expert assessments for these criteria and alternatives are completed via collaborative filtering. The sample for this study consists of evaluations provided by six experts in the fields of renewable energy and climate science. The data is collected through structured interviews and questionnaires, focusing on the criteria and alternatives relevant to climate change mitigation in renewable energy projects. Criteria are weighted with the help of molecular fuzzy cognitive maps. Strategies are ranked by using fuzzy molecular ranking (MORAN). The main contribution of this study is that a comprehensive evaluation can be conducted to generate the strategies to minimize the negative impacts of climate change on these projects by creating a new model. Weather changes and ecosystem disruptions are the climate change factor that has the most negative impact on the performance of renewable energy projects. Some standards should be determined, or necessary arrangements should be made to comply with existing international standards. The integration of different renewable energy sources is an important strategy to eliminate the negative effects of climate change on renewable energy projects.

{"title":"Hybrid molecular fuzzy recommender systems for impact of climate change on renewable energy performance","authors":"Yedan Shen , Wei Liu , Hasan Dinçer , Serhat Yüksel","doi":"10.1016/j.renene.2025.122799","DOIUrl":"10.1016/j.renene.2025.122799","url":null,"abstract":"<div><div>The purpose of this study is to identify the most convenient strategies to manage the negative impacts of climate change on renewable energy projects effectively. Missing expert assessments for these criteria and alternatives are completed via collaborative filtering. The sample for this study consists of evaluations provided by six experts in the fields of renewable energy and climate science. The data is collected through structured interviews and questionnaires, focusing on the criteria and alternatives relevant to climate change mitigation in renewable energy projects. Criteria are weighted with the help of molecular fuzzy cognitive maps. Strategies are ranked by using fuzzy molecular ranking (MORAN). The main contribution of this study is that a comprehensive evaluation can be conducted to generate the strategies to minimize the negative impacts of climate change on these projects by creating a new model. Weather changes and ecosystem disruptions are the climate change factor that has the most negative impact on the performance of renewable energy projects. Some standards should be determined, or necessary arrangements should be made to comply with existing international standards. The integration of different renewable energy sources is an important strategy to eliminate the negative effects of climate change on renewable energy projects.</div></div>","PeriodicalId":419,"journal":{"name":"Renewable Energy","volume":"245 ","pages":"Article 122799"},"PeriodicalIF":9.0,"publicationDate":"2025-03-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143562446","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

The influence of jet medium disturbance on combustion of hydrogen-doped natural gas in low temperature environment

IF 9 1区工程技术 Q1 ENERGY & FUELS

Renewable Energy

Pub Date : 2025-03-02 DOI: 10.1016/j.renene.2025.122790

Qi Jing , Houjia Xu , Zhiyuan Yang , Dan Wang , Yuntao Li , Laibin Zhang

Ambient winds, obstructions or the operation of mechanical devices can induce turbulent disturbances in the flow field of hydrogen-doped natural gas combustion. The effects of the initial turbulent environment formed by two types of jet medium, N₂ and compressed air (CA), on the combustion characteristics of Natural Gas-H₂-Air mixtures at about 0 °C are investigated by combining experiments and dynamic simulations for the flow field. While at P_jet (jet intensity) = 0.6 MPa, the X_N2 (Molar fraction of nitrogen) in the flow field of the N₂ jet increases by 0.39 % in comparison with the CA jet. The jet enhances the flame instability of the gas mixture by inducing turbulent disturbances, which in turn increases the frequency of flame cell splitting. The P_max (Peak overpressure) and τ (The time required to reach the peak overpressure) of mixtures show an increasing trend with rising P₀ (initial pressure)when P_jet < 0.4 MPa. For the N₂ jet medium, the k (Turbulent kinetic energy) of the flow field at the moment of ignition is higher than 1.25 m²/s² when P_jet > 0.4 MPa, and the inerting effect gradually dominates, this phenomenon is more significant at higher P_0.. The I (The impulse accumulation during the combustion)shows an increasing initially and then decreasing trend and reaches the maximum decreasing rate when P_jet increases from 0.4 MPa to 0.5 MPa. With the increase of P_jet to 0.6 MPa, the introduction of jet has an inhibiting effect on the P_max, which is reduced by 5.12 % compared with the static conditions. The research results can provide important reference for the safe use of hydrogen-doped natural gas and quantitative analysis of combustion risks in low-temperature environments.

{"title":"The influence of jet medium disturbance on combustion of hydrogen-doped natural gas in low temperature environment","authors":"Qi Jing , Houjia Xu , Zhiyuan Yang , Dan Wang , Yuntao Li , Laibin Zhang","doi":"10.1016/j.renene.2025.122790","DOIUrl":"10.1016/j.renene.2025.122790","url":null,"abstract":"<div><div>Ambient winds, obstructions or the operation of mechanical devices can induce turbulent disturbances in the flow field of hydrogen-doped natural gas combustion. The effects of the initial turbulent environment formed by two types of jet medium, N<sub>2</sub> and compressed air (CA), on the combustion characteristics of Natural Gas-H<sub>2</sub>-Air mixtures at about 0 °C are investigated by combining experiments and dynamic simulations for the flow field. While at <em>P</em><sub>jet</sub> (jet intensity) = 0.6 MPa, the <em>X</em><sub><em>N2</em></sub> (Molar fraction of nitrogen) in the flow field of the N<sub>2</sub> jet increases by 0.39 % in comparison with the CA jet. The jet enhances the flame instability of the gas mixture by inducing turbulent disturbances, which in turn increases the frequency of flame cell splitting. The <em>P</em><sub>max</sub> (Peak overpressure) and <em>τ</em> (The time required to reach the peak overpressure) of mixtures show an increasing trend with rising <em>P</em><sub><em>0</em></sub> (initial pressure)when <em>P</em><sub>jet</sub> < 0.4 MPa. For the N<sub>2</sub> jet medium, the <em>k</em> (Turbulent kinetic energy) of the flow field at the moment of ignition is higher than 1.25 m<sup>2</sup>/s<sup>2</sup> when <em>P</em><sub>jet</sub> > 0.4 MPa, and the inerting effect gradually dominates, this phenomenon is more significant at higher <em>P</em><sub>0.</sub>. The <em>I</em> (The impulse accumulation during the combustion)shows an increasing initially and then decreasing trend and reaches the maximum decreasing rate when <em>P</em><sub>jet</sub> increases from 0.4 MPa to 0.5 MPa. With the increase of <em>P</em><sub>jet</sub> to 0.6 MPa, the introduction of jet has an inhibiting effect on the <em>P</em><sub>max</sub>, which is reduced by 5.12 % compared with the static conditions. The research results can provide important reference for the safe use of hydrogen-doped natural gas and quantitative analysis of combustion risks in low-temperature environments.</div></div>","PeriodicalId":419,"journal":{"name":"Renewable Energy","volume":"245 ","pages":"Article 122790"},"PeriodicalIF":9.0,"publicationDate":"2025-03-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143562441","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Inoculum dependence of methane formation from lignocellulosic biowastes

IF 9 1区工程技术 Q1 ENERGY & FUELS

Renewable Energy

Pub Date : 2025-03-01 DOI: 10.1016/j.renene.2025.122777

Armando Oliva , Stefano Papirio , Francesco Pirozzi , Giovanni Esposito , Piet N.L. Lens

Anaerobic digestion (AD) is a well-established process to produce methane from recalcitrant waste materials, such as lignocellulosic substrates (LSs). This study investigated the interaction between three LSs, i.e., hazelnut skin (HS), spent coffee grounds (SCG), and almond shells (AS), and different inocula, i.e., crushed granular sludge (CrGS), digestate from buffalo manure (DBM), and digestate from sewage sludge (DSS). The CrGS was the less suitable inoculum, resulting in 219.1 (±11.8) and 21.2 (±4.3) mL CH₄/g VS from SCG and AS, respectively, whereas no methane was produced from HS with CrGS. A methanol-organosolv pretreatment improved the methane potential of SCG by 21 % and unlocked AD of HS with CrGS producing 289.6 (±9.9) mL CH₄/g VS, but no significant effect was observed on AS. DSS was the best-performing inoculum to digest the investigated LSs, achieving similar results to DBM for HS and SCG, but increasing the methane potential of AS up to 90.7 (±4.3) mL CH₄/g VS. DSS was particularly rich in microorganisms of the Synergistota (13.0 %) and Chloroflexi (25.0 %) phyla, which are capable of degrading complex biomolecules such as proteins and lipids present in HS, SCG, and AS.

{"title":"Inoculum dependence of methane formation from lignocellulosic biowastes","authors":"Armando Oliva , Stefano Papirio , Francesco Pirozzi , Giovanni Esposito , Piet N.L. Lens","doi":"10.1016/j.renene.2025.122777","DOIUrl":"10.1016/j.renene.2025.122777","url":null,"abstract":"<div><div>Anaerobic digestion (AD) is a well-established process to produce methane from recalcitrant waste materials, such as lignocellulosic substrates (LSs). This study investigated the interaction between three LSs, i.e., hazelnut skin (HS), spent coffee grounds (SCG), and almond shells (AS), and different inocula, i.e., crushed granular sludge (CrGS), digestate from buffalo manure (DBM), and digestate from sewage sludge (DSS). The CrGS was the less suitable inoculum, resulting in 219.1 (±11.8) and 21.2 (±4.3) mL CH<sub>4</sub>/g VS from SCG and AS, respectively, whereas no methane was produced from HS with CrGS. A methanol-organosolv pretreatment improved the methane potential of SCG by 21 % and unlocked AD of HS with CrGS producing 289.6 (±9.9) mL CH<sub>4</sub>/g VS, but no significant effect was observed on AS. DSS was the best-performing inoculum to digest the investigated LSs, achieving similar results to DBM for HS and SCG, but increasing the methane potential of AS up to 90.7 (±4.3) mL CH<sub>4</sub>/g VS. DSS was particularly rich in microorganisms of the <em>Synergistota</em> (13.0 %) and <em>Chloroflexi</em> (25.0 %) phyla, which are capable of degrading complex biomolecules such as proteins and lipids present in HS, SCG, and AS.</div></div>","PeriodicalId":419,"journal":{"name":"Renewable Energy","volume":"245 ","pages":"Article 122777"},"PeriodicalIF":9.0,"publicationDate":"2025-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143548671","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Thermal modelling of semitransparent photovoltaic thermal and flat plate collector integrated biogas plant for slurry heating: An experimental validation

IF 9 1区工程技术 Q1 ENERGY & FUELS

Renewable Energy

Pub Date : 2025-03-01 DOI: 10.1016/j.renene.2025.122778

Rohit Kumar Singh , Gopal Nath Tiwari , Akhoury Sudhir Kumar Sinha

Escalating energy costs, diminishing fossil fuel reserves, increasing energy consumption, and significant environmental impacts are key aspects of the severe global energy crisis. So, a hybrid renewable energy system with improved energy efficiency and advanced energy solutions is required. In this proposed model, a floating dome biogas plant was integrated with solar panels to maximize biogas production and establish a self-sufficient system capable of functioning in severe winter conditions and generating biogas throughout the year. An analytical expression for a biogas-integrated solar module's thermal and electrical energy output has been derived as a function of design parameters and the cold climatic conditions of RGIPT, Amethi, India. Furthermore, numerical computations using MATLAB 2021b were performed to investigate the impact of the number of SPVT-M water collectors, mass flow rate, and packing factors (β) on the performance of the SPVT-M water collectors. The experiment (26 Jan to 6 Feb 2024) showed a daily slurry temperature increase of 1.2–1.4 °C, from 19 °C to 35 °C, with 3.8 kW h/m² daily solar radiation and 14.8 °C average ambient temperature. Validation of the mathematical model showed strong model correlation (r = 0.98, e = 2.23). Biogas production rose from 3.5 kg to 13.5 kg per day after integrating solar module heating. Validating the experimental results with mathematical modelling ensures the model's utility in optimizing biogas production under specific climatic conditions, which can lead to improved system design and operation.

{"title":"Thermal modelling of semitransparent photovoltaic thermal and flat plate collector integrated biogas plant for slurry heating: An experimental validation","authors":"Rohit Kumar Singh , Gopal Nath Tiwari , Akhoury Sudhir Kumar Sinha","doi":"10.1016/j.renene.2025.122778","DOIUrl":"10.1016/j.renene.2025.122778","url":null,"abstract":"<div><div>Escalating energy costs, diminishing fossil fuel reserves, increasing energy consumption, and significant environmental impacts are key aspects of the severe global energy crisis. So, a hybrid renewable energy system with improved energy efficiency and advanced energy solutions is required. In this proposed model, a floating dome biogas plant was integrated with solar panels to maximize biogas production and establish a self-sufficient system capable of functioning in severe winter conditions and generating biogas throughout the year. An analytical expression for a biogas-integrated solar module's thermal and electrical energy output has been derived as a function of design parameters and the cold climatic conditions of RGIPT, Amethi, India. Furthermore, numerical computations using MATLAB 2021b were performed to investigate the impact of the number of SPVT-M water collectors, mass flow rate, and packing factors (β) on the performance of the SPVT-M water collectors. The experiment (26 Jan to 6 Feb 2024) showed a daily slurry temperature increase of 1.2–1.4 °C, from 19 °C to 35 °C, with 3.8 kW h/m<sup>2</sup> daily solar radiation and 14.8 °C average ambient temperature. Validation of the mathematical model showed strong model correlation (r = 0.98, e = 2.23). Biogas production rose from 3.5 kg to 13.5 kg per day after integrating solar module heating. Validating the experimental results with mathematical modelling ensures the model's utility in optimizing biogas production under specific climatic conditions, which can lead to improved system design and operation.</div></div>","PeriodicalId":419,"journal":{"name":"Renewable Energy","volume":"245 ","pages":"Article 122778"},"PeriodicalIF":9.0,"publicationDate":"2025-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143577144","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Sensible thermal energy storage in packed beds using supercritical CO2: A comparative study of tanks with steel-only and reinforced concrete walls

IF 9 1区工程技术 Q1 ENERGY & FUELS

Renewable Energy

Pub Date : 2025-03-01 DOI: 10.1016/j.renene.2025.122726

Thaís D. Luz , Felipe G. Battisti , Alexandre K. da Silva

Packed-bed thermal energy storage (PBTES) is an affordable option to store energy in concentrated solar power (CSP) plants, where supercritical carbon dioxide (s-CO

_{2}

) can be the working fluid in Brayton cycles. Due to the elevated operating pressures required by the s-CO

_{2}

in the power block, the PBTES tanks require thick walls to operate safely, representing constructive and economic constraints for their applicability. Then, this work compares two constructive alternatives from a numerical standpoint: steel-only walls and reinforced concrete (RC) walls. The comparison of these wall materials considers their thermal performance and the levelized cost of storage (LCOS) for different tank configurations, a novelty from the perspective of comparing the performance of different wall materials for PBTES tanks. A fixed volume of

2660 m^{3}

, required for

8 h

discharge in a

10 MW

CSP plant, is maintained. The total storage volume can be divided into one, two, four, or eight parallel tanks while considering several aspect ratio values (

A R = 0.5

to 10) and wall inclinations (

φ = 0^{\circ}

, 5°, and 10°). The reinforced concrete walls excel in every aspect considered, and the one-tank configuration with

A R = 1

and

φ = 0^{\circ}

presents the best

L C O S

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引用次数: 0

Self-adaptive single-diode model parameter identification under small mismatching conditions

IF 9 1区工程技术 Q1 ENERGY & FUELS

Renewable Energy

Pub Date : 2025-03-01 DOI: 10.1016/j.renene.2025.122735

Luis E. Garcia-Marrero , Carlos I. Pavon-Vargas , Juan D. Bastidas-Rodriguez , Eric Monmasson , Giovanni Petrone

Current model-based methods for monitoring photovoltaic (PV) modules typically rely on the single-diode model (SDM) or its variants, assuming uniform operating conditions across the module. However, these ideal conditions are difficult to realize in real-world applications due to partial shading, soiling, degradation, and other phenomena. This paper proposes a 7-parameter self-adapting Double SDM model (D-SDM) to enhance the accuracy and reliability of parameter identification in PV modules under real operating conditions. A robust methodology based on evolutionary algorithms is proposed to estimate the parameters of the D-SDM, directly from the I–V characteristic of a PV module, applicable in both uniform and mismatched scenarios. The proposed methodology also includes a robust fitting error calculation that only considers the section of the I-V curve where all the cells operate with positive voltage. The methodology is validated using experimental and simulated I–V curves across various mismatching patterns, demonstrating the superior stability and reliability of the proposed method, which can be used for PV system monitoring and diagnosis in complex conditions.

{"title":"Self-adaptive single-diode model parameter identification under small mismatching conditions","authors":"Luis E. Garcia-Marrero , Carlos I. Pavon-Vargas , Juan D. Bastidas-Rodriguez , Eric Monmasson , Giovanni Petrone","doi":"10.1016/j.renene.2025.122735","DOIUrl":"10.1016/j.renene.2025.122735","url":null,"abstract":"<div><div>Current model-based methods for monitoring photovoltaic (PV) modules typically rely on the single-diode model (SDM) or its variants, assuming uniform operating conditions across the module. However, these ideal conditions are difficult to realize in real-world applications due to partial shading, soiling, degradation, and other phenomena. This paper proposes a 7-parameter self-adapting Double SDM model (D-SDM) to enhance the accuracy and reliability of parameter identification in PV modules under real operating conditions. A robust methodology based on evolutionary algorithms is proposed to estimate the parameters of the D-SDM, directly from the <em>I–V</em> characteristic of a PV module, applicable in both uniform and mismatched scenarios. The proposed methodology also includes a robust fitting error calculation that only considers the section of the I-V curve where all the cells operate with positive voltage. The methodology is validated using experimental and simulated <em>I–V</em> curves across various mismatching patterns, demonstrating the superior stability and reliability of the proposed method, which can be used for PV system monitoring and diagnosis in complex conditions.</div></div>","PeriodicalId":419,"journal":{"name":"Renewable Energy","volume":"245 ","pages":"Article 122735"},"PeriodicalIF":9.0,"publicationDate":"2025-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143548672","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Efficient hydropower modeling for medium-term hydrothermal planning using data-driven approaches

IF 9 1区工程技术 Q1 ENERGY & FUELS

Renewable Energy

Pub Date : 2025-03-01 DOI: 10.1016/j.renene.2025.122730

Jesús D. Gómez-Pérez , Francisco Labora , Jesus M. Latorre-Canteli , Andres Ramos

The continuous rise of renewable energy in the global energy mix highlights the need to analyze and enhance traditional energy plants’ flexibility to support integration. Hydropower, with its rapid response capabilities and significant energy storage, plays a vital role in this context. However, simplifications are required due to the complex interconnections among cascaded hydropower plants and the inherent uncertainty of water inflows. This study presents a data-driven methodology for representing hydropower plants physically and through equivalent energy models, accounting for inflow uncertainties implicitly. Using historical data, we apply analytical techniques – including auxiliary linear models, load-duration curves, and filtering methods in linear regressions – to configure key hydropower parameters such as water inflows, reservoir boundaries, and hydropower plant production limits. These methods can be applied across hydro systems of different scales. We have validated our approach for the Spanish system for 2019 and 2025, demonstrating its efficacy.

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引用次数: 0

Sustainable H2-rich bio-syngas production from high moisture wastes: Steam gasification of hydrochars obtained from apple pomace in single and binary solvent systems

IF 9 1区工程技术 Q1 ENERGY & FUELS

Renewable Energy

Pub Date : 2025-03-01 DOI: 10.1016/j.renene.2025.122772

Mariusz Wądrzyk, Przemysław Grzywacz, Marek Plata, Piotr Soprych, Rafał Janus, Marek Lewandowski, Łukasz Korzeniowski

Innovative solutions dedicated to valorization of high moisture content wastes into perspective groups of products like hydrocarbons or hydrogen are sought. Herein, we propose a two-stage processing route involving hydrothermal processing of apple pomace (AP) with the subsequent steam gasification. AP was converted into hydrochar using either a single solvent (water or ethanol) or a binary solvent (water mixed with ethanol). The effect of the medium type on the change in the yield and quality of the resultant hydrochar was studied, including comprehensive characterization. The subsequent step was to upgrade the resultant hydrochars through steam gasification at 900 °C. A noticeable influence of the application of a type of solvent medium on the conversion level of the pristine structure, as well as on the effectiveness of steam gasification, was noted. Syngas included hydrogen, methane, carbon dioxide, and carbon monoxide, with hydrogen being the dominant component (56–60 %). The high share of methane in bio-syngas translates into a relatively high energy potential of the residual gas after possible hydrogen separation. The aqueous system produced the most reactive and high-yielding hydrochar, while the ethanol system exhibited the lowest values due to differences in porous structure, elemental composition, and structure of surface functional groups.

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引用次数: 0

Transforming aid-funded renewable energy systems: A case study of policy-driven financial sustainability in rural Bangladesh

IF 9 1区工程技术 Q1 ENERGY & FUELS

Renewable Energy

Pub Date : 2025-02-28 DOI: 10.1016/j.renene.2025.122752

HyunAh Yi , Kyung Nam Kim

Efforts to improve energy access in off-grid areas through donated photovoltaic (PV) systems often encounter sustainability challenges, particularly due to inadequate maintenance resulting from financial constraints. These challenges are compounded when national power grids extend to off-grid regions, leaving existing PV systems underutilized or abandoned. To enhance the sustainability of these systems, this study performs an economic analysis of connecting previously off-grid PV systems to the national power grid with the System Advisory Model (SAM). The analysis examines whether the existing PV systems can generate sufficient revenue to cover operational costs and ensure their long-term viability. Simulations evaluate two schemes -net metering and feed-in tariff- as potential solutions to integrating PV systems into the national power grid while maintaining economic benefits. Results demonstrate that donated PV systems can achieve economic viability under compensation rates lower than those currently supported by government policies. Such reduced compensation rates allow governments to procure electricity at a lower cost while enabling prosumers to meet operational expenses. These findings provide insights into enhancing the sustainability of equipment installed in off-grid areas as electrification expands and offer a framework for diversifying compensation rate policies in government initiatives.

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引用次数: 0

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