Renewable Energy最新文献

{"title":"A novel structure adaptive new information priority grey Bernoulli model and its application in China's renewable energy production","authors":"Yong Wang ,&nbsp;Zhongsen Yang ,&nbsp;Ying Zhou ,&nbsp;Hao Liu ,&nbsp;Rui Yang ,&nbsp;Lang Sun ,&nbsp;Flavian Emmanuel Sapnken ,&nbsp;Govindasami Narayanan","doi":"10.1016/j.renene.2024.122052","DOIUrl":"10.1016/j.renene.2024.122052","url":null,"abstract":"<div><div>At present, the global energy structure is undergoing major changes. China is in the transition period of energy structure. Accurately anticipating future energy trends is critical for China's energy structure and modernization. Considering the uncertainty and sparsity characteristics of China's energy system sequence, this study examines China's renewable energy scenario using the grey model with limited sample and uncertain system modelling features. Renewable energy is affected by a variety of uncertain factors, exhibiting a range of complicated traits including nonlinearity, periodicity and random volatility. The traditional grey model has been difficult to appropriately predict its future evolution. This paper focuses on the adaptability of the model, optimizes and improves the accumulation operator and model structure, and establishes a fractional-order structural self-adaptation grey Bernoulli model based on new information priority. Firstly, based on the new information priority accumulation operator, it is extended to the fractional order. In terms of model structure, combined with NGBM(1,1) model, SADGM(1,1) model and FPGM(1,1) model, periodic fluctuation term and nonlinear power term are included to improve the model's capacity to capture nonlinear, fluctuating and periodic features, and enhance the adaptability and flexibility of the model. The backward difference technique yields the model's parameter estimation and temporal response sequence. Based on the results of the algorithm comparison experiment, the Improved Grey Wolf Optimization Algorithm is chosen to optimize the structural parameters of the model in an effort to enhance its performance. The performance comparison experiment of the model was designed, and three cases of China's hydropower generation, China's renewable energy power generation installed capacity and China's solar energy quarterly power generation were selected to compare the performance with a variety of grey prediction models. Monte-Carlo simulation and probability density analysis were utilized to confirm the stability and accuracy of the proposed model. The results show that the proposed FSANGBM(1,1) model can handle data series of renewable energy with nonlinear, volatile, and periodic features with high prediction ability. Finally, the model is applied to forecast three cases' future development trends.</div></div>","PeriodicalId":419,"journal":{"name":"Renewable Energy","volume":"239 ","pages":"Article 122052"},"PeriodicalIF":9.0,"publicationDate":"2024-11-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142759349","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}

{"title":"Fast optimal control performance evaluation for wave energy control co-design","authors":"Zechuan Lin ,&nbsp;Xuanrui Huang ,&nbsp;Xi Xiao ,&nbsp;John V. Ringwood","doi":"10.1016/j.renene.2024.121974","DOIUrl":"10.1016/j.renene.2024.121974","url":null,"abstract":"<div><div>With the application of energy-maximizing control for wave energy converters (WECs), the WEC design problem becomes a control co-design problem. One of the fundamental requirements of co-design is to evaluate the optimal control performance, i.e., average power generation. Previous control techniques include model predictive control (MPC) and pseudo-spectral (PS) control, but both require iterative optimization, with computational requirements the main limiting factor in co-design. In this study, a fast optimal control performance evaluation method is proposed based on a ‘wave-by-wave’ (WbW) representation. The idea is to split the wave excitation force (WEF) signals into individual waves, process them separately, and then combine the results with the distribution of WEF amplitude and period, yielding a straightforward average power calculation. The method is fully developed and studied, considering the cases of position-only, and general, constraints, as well as different choices to obtain the WEF parameter distribution. It is shown that the WbW method can achieve a very high control evaluation fidelity (within a 5% error) and give almost the same co-design result as MPC and PS (implemented using WecOptTool), but with a significantly reduced computation time (e.g., hundreds of times faster), therefore being a game changer for control co-design of WECs.</div></div>","PeriodicalId":419,"journal":{"name":"Renewable Energy","volume":"239 ","pages":"Article 121974"},"PeriodicalIF":9.0,"publicationDate":"2024-11-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142759348","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}

{"title":"Research on the mechanism of the effect of vortex on the hydraulic loss of pump as turbine units based on entropy production theory","authors":"Xijie Song ,&nbsp;Zhengwei Wang ,&nbsp;Yan Jin ,&nbsp;Chao Liu ,&nbsp;Presas Alexandre ,&nbsp;Fangping Tang ,&nbsp;Yonggang Lu","doi":"10.1016/j.renene.2024.122048","DOIUrl":"10.1016/j.renene.2024.122048","url":null,"abstract":"<div><div>Pump as turbine (PAT) is a common method of energy recovery, however, vortices are a negative phenom for these units. The objective of this research is to study the effect of vortex motion on the hydraulic loss of pump as turbine, and establishing the correlation mechanism between vortex intensity and turbulence loss. The research method adopts theoretical analysis and model test and numerical simulation. Based on the entropy production theory, the hydraulic loss and the turbulent dissipation in boundary layer induced by vortex motion are studied, revealing the influence of vortices on the energy loss. Results show that the vortex motion can be decomposed into a synchronous component <span><math><mrow><msub><mover><mi>v</mi><mo>˜</mo></mover><mrow><mi>s</mi><mi>y</mi></mrow></msub></mrow></math></span> and a rotational component <span><math><mrow><msub><mover><mi>v</mi><mo>˜</mo></mover><mrow><mi>r</mi><mi>o</mi></mrow></msub></mrow></math></span>, among them, the rotational component <span><math><mrow><msub><mover><mi>v</mi><mo>˜</mo></mover><mrow><mi>r</mi><mi>o</mi></mrow></msub></mrow></math></span> meets to Biot-Savart Law. The turbulent dissipation rate in the boundary layer is closely to the vortex motion, which can characterize the boundary turbulence height. Turbulent flow induced by vortex can propagate in the flow channel of the unit, causing lot of additional hydraulic loss. In the end, a mathematical model between entropy production (<em>S</em>_k) induced by vortex and vortex strength (<em>Г</em>_k) was established, indicating that <em>S</em>_k changes with <em>Г</em>_k in the form of a quadratic function.</div></div>","PeriodicalId":419,"journal":{"name":"Renewable Energy","volume":"239 ","pages":"Article 122048"},"PeriodicalIF":9.0,"publicationDate":"2024-11-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142759343","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}

{"title":"Investigation of the Comparative okra drying performance of a geothermal and solar hybrid forced convection indirect type cabinet dryer","authors":"Mesut Yazici ,&nbsp;Ramazan Kose ,&nbsp;Semra Durmus Acer","doi":"10.1016/j.renene.2024.122031","DOIUrl":"10.1016/j.renene.2024.122031","url":null,"abstract":"<div><div>This study investigated the okra drying performance of a dryer in which solar and geothermal energy are used together to ensure an uninterrupted operation in the drying processes. For this reason, the performance of the geothermal and solar hybrid forced convection indirect type cabinet dryer was compared with the solar forced convection indirect type cabinet dryer and traditional shade drying methods. In three different experiments, okras were dried from the initial moisture value of 7.735, 8.245, and 8.82 g water/g dry material (d.b.) to the final moisture value of 0.3 g water/g dry material (d.b.). These experiments were carried out in entirely cloudy, partly cloudy, and completely clear weather conditions. Geothermal energy contributed 58.4 % in completely cloudy weather and 49.5 % in completely clear weather. The first tray level of the hybrid dryer reached the final moisture value in 27 h at the earliest. Temperature and humidity changes in all main components of the dryers were analyzed. In addition, the energy analyses of the dryers are discussed. Afterward, aflatoxin and color analyses of dried okra were made.</div></div>","PeriodicalId":419,"journal":{"name":"Renewable Energy","volume":"239 ","pages":"Article 122031"},"PeriodicalIF":9.0,"publicationDate":"2024-11-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142759347","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}

{"title":"Developing a multi-region coupled analysis method for floating offshore wind turbine based on OpenFOAM","authors":"Yefeng Cai ,&nbsp;Xin Li ,&nbsp;Haisheng Zhao ,&nbsp;Wei Shi ,&nbsp;Ziming Wang","doi":"10.1016/j.renene.2024.122026","DOIUrl":"10.1016/j.renene.2024.122026","url":null,"abstract":"<div><div>As floating offshore wind turbines (FOWTs) continue to scale up in size, the simulation technology for coupling aerodynamic, hydrodynamic, and mooring forces presents significant challenges. This study proposes a multi-region coupled simulation solver, MRFoam, for FOWTs. The multi-region coupled method divides the computational domain into two parts: the turbine region and the floating platform region. This division reduces the number of grid cells and facilitates modular simulations for various structural forms and operating conditions. Compared to the traditional fully coupled method, the multi-region coupled method significantly improves computational efficiency. For various models and grid quantities, the computational efficiency of the multi-region coupled method is nearly double that of the fully coupled method with the results remaining almost identical. Subsequently, the multi-region coupled model is applied for the aerodynamic, hydrodynamic and mooring dynamic analyses of a large-scale FOWT (IEA 15 MW) under various wind and wave conditions. The study found that a decrease in wind speed increases the amplitude of surge response while decreasing the amplitude of heave response. Additionally, at lower wind speeds, an increase in wave height amplifies the platform's motion response, while the variation in aerodynamic thrust is slightly influenced by the change in the platform's motion amplitude.</div></div>","PeriodicalId":419,"journal":{"name":"Renewable Energy","volume":"238 ","pages":"Article 122026"},"PeriodicalIF":9.0,"publicationDate":"2024-11-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142745455","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}

{"title":"Synergistic effects in the Co-pyrolysis of waste tires, plastics, and corn stalks: Kinetic and thermodynamic analyses for enhanced resource utilization","authors":"Tilun Shan,&nbsp;Hu Chen,&nbsp;Ting Liu,&nbsp;Zizhen Ma,&nbsp;Yan Tan,&nbsp;Huawei Zhang","doi":"10.1016/j.renene.2024.122024","DOIUrl":"10.1016/j.renene.2024.122024","url":null,"abstract":"<div><div>In this study, the co-pyrolysis of corn stalks (Cs) with various polymer waste materials, including waste tires (WTs), waste plastics (WPs), and their blends (WTs/WPs), is investigated. Thermogravimetric analysis (TGA), kinetic models (FWO, Starink, DAEM), and pyrolysis tube furnace equipment are utilized for a comprehensive evaluation and analysis of pyrolysis and co-pyrolysis. The results indicate that the addition of Cs during pyrolysis significantly reduces the pyrolysis temperature of WTs, WPs, and their blends by 35.1–245.7 °C. Kinetic analysis reveals that the actual activation energy of WTs/WPs (235.5 kJ/mol) is lower than the theoretical prediction (239.2 kJ/mol). Theoretical thermogravimetric and derivative thermogravimetric (TG-DTG) curves show distinct peaks indicative of positive synergism, confirming the beneficial interaction between WTs and WPs. However, other mixed samples (WTs/Cs, WPs/Cs and WTs/WPs/Cs) display varying degrees of negative synergism due to the presence of oxygen-containing functional groups (C-O-C and O-H). Pyrolysis experiments in a tube furnace demonstrate that the positive synergistic effect enhances the pyrolysis oil yield, with the actual oil yield of WTs/WPs (60.15 wt%) exceeding the expected theoretical value (58.03 wt%). In contrast, the negative synergistic effect observed in WPs/Cs and WTs/WPs/Cs is more conducive to gas production. The findings of this study provide theoretical and parametric support for the co-pyrolysis of solid waste products, aiming to reduce energy consumption, enhance oil production rates, and address limitations.</div></div>","PeriodicalId":419,"journal":{"name":"Renewable Energy","volume":"238 ","pages":"Article 122024"},"PeriodicalIF":9.0,"publicationDate":"2024-11-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142746015","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}

{"title":"The effect of H2O on the pyrolysis behavior of cellulose: A reactive molecular dynamic investigation","authors":"Chunhe Jiang ,&nbsp;Cheng Xue ,&nbsp;Wang Liang ,&nbsp;Kejiang Li ,&nbsp;Bo Liu ,&nbsp;Jiaqi Li ,&nbsp;Zeng Liang ,&nbsp;Jianliang Zhang","doi":"10.1016/j.renene.2024.122027","DOIUrl":"10.1016/j.renene.2024.122027","url":null,"abstract":"<div><div>This research investigated the pyrolysis mechanism of cellulose under water and vacuum conditions. The effect of water molecules on cellulose pyrolysis is influenced by temperature. Water molecule exhibits inhibitory effects at temperatures of 1800–2100K, resulting in lower gas production compared to vacuum conditions. This inhibition primarily occurs because the presence of water molecules suppresses the cleavage of C-O and C-H bonds. Under low-temperature conditions (1200–1500K), compared to vacuum conditions, the water environment mainly promotes the cleavage of hydroxyl groups in cellulose, thereby facilitating the formation of smaller molecular fragments. At high temperatures (2400–3000K), the participation of water molecules leads to the abundant production of combustible gases such as CO, CH₄, and H₂. The corresponding gas production mechanisms also become increasingly enriched with the involvement of water. The insights gained from this study on the pyrolysis process of cellulose can effectively guide the utilization of biomass resources.</div></div>","PeriodicalId":419,"journal":{"name":"Renewable Energy","volume":"238 ","pages":"Article 122027"},"PeriodicalIF":9.0,"publicationDate":"2024-11-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142746109","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}

{"title":"Photoelectric-coupled multilayer smart glass synergistically regulated with doped nanoparticles of GaAs and IST phase change layers","authors":"Shuni Chen ,&nbsp;Yanming Guo ,&nbsp;Chao Shen ,&nbsp;Yong Shuai","doi":"10.1016/j.renene.2024.122023","DOIUrl":"10.1016/j.renene.2024.122023","url":null,"abstract":"<div><div>Windows are the main part of the building energy exchange. Most of the solar energy that passes through the windows is reflected or converted into heat loss, which causes a great waste of energy. To improve the energy utilization, this work presents the design of a multilayer glass with a GaAs layer doped by nanoparticles and an IST (In₃SbTe₂) phase change layer. The dielectric function of the doped layer is obtained by the Maxwell-Garnett effective medium theory. The transmittance and the photoelectric conversion efficiency are calculated through the transfer matrix method. With the genetic algorithm, the structure parameters are optimized to achieve the high values of both average transmittance in human-eye response band and photoelectric conversion energy. The average transmittance of the human eye response band for the structure containing only GaAs doped layer reaches 0.5–0.6, and the average photovoltaic conversion efficiency is above 0.2. After adding the IST phase change layer, the difference of ranges of the spectral regulation between the two phases in the metal nanoparticle doped structure can reach more than 0.25. The light transmission regulation is realized by active phase change. This work provides an optimization-based analysis approach and a possible design of the multilayer smart glass.</div></div>","PeriodicalId":419,"journal":{"name":"Renewable Energy","volume":"238 ","pages":"Article 122023"},"PeriodicalIF":9.0,"publicationDate":"2024-11-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142745456","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}

{"title":"Optimized thermoelectric generation for efficient low-medium temperature geothermal energy harvesting","authors":"Zafar Hayat Khan ,&nbsp;Heping Xie ,&nbsp;Licheng Sun ,&nbsp;Wei Yang ,&nbsp;Waqar A. Khan ,&nbsp;Bixiong Li ,&nbsp;Xiting Long ,&nbsp;Jun Wang ,&nbsp;Cunbao Li ,&nbsp;Mingzhong Gao ,&nbsp;He Ruan","doi":"10.1016/j.renene.2024.122032","DOIUrl":"10.1016/j.renene.2024.122032","url":null,"abstract":"<div><div>This paper aims to design and evaluate a thermoelectric generation system optimized for low-to-medium temperature geothermal energy, focusing on maximizing power output and system efficiency. A one-dimensional mathematical model based on energy balance is employed for a single thermoelectric element and subsequently scaled to a 600 thermoelectric generators (TEGs) module. The Peltier, Fourier, and Joule heating effects are included in the analysis, whereas the radiation and convection effects are neglected. The impact of various 2D and 3D layouts of thermoelectric generators (TEGs) and temperature variations on power generation and performance is examined. An experiment is performed to observe the power capacity of a module consisting of five thermoelectric generators. These experimental observations validate the analytical model, and reference properties are adopted to predict more complex modules. This work aims to simulate the optimal design of a TEG module, utilizing the temperature difference to generate 1 kW of power. For this purpose, a module comprising of 600 TEGs is analyzed in various layouts. Based on experimental results for the temperature difference <span><math><mrow><mo>Δ</mo><mi>T</mi><mo>=</mo><mn>96.4</mn><mmultiscripts><mi>C</mi><mprescripts></mprescripts><none></none><mi>o</mi></mmultiscripts></mrow></math></span>, it is proposed that a compact module consisting of 600 TEGs with a 3D design of 10 × 12 × 5 will be suitable and cost-effective to generate 1 kW power.</div></div>","PeriodicalId":419,"journal":{"name":"Renewable Energy","volume":"239 ","pages":"Article 122032"},"PeriodicalIF":9.0,"publicationDate":"2024-11-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142759344","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}

{"title":"Co-combustion of straw and waste rubber thermolysis char in a moving grate boiler","authors":"Robert Junga ,&nbsp;Szymon Sobek ,&nbsp;Kamila Mizerna ,&nbsp;Krzysztof Drożdżol ,&nbsp;Mirosław Kabaciński ,&nbsp;Hanna Moskal-Zaucha ,&nbsp;Iwona Wróbel-Iwaniec ,&nbsp;Mateusz Rogowski","doi":"10.1016/j.renene.2024.121948","DOIUrl":"10.1016/j.renene.2024.121948","url":null,"abstract":"<div><div>The study investigates the co-combustion of straw with waste rubber thermolysis char and the addition of 4% lime in a small-scale pellet-fired boiler. Char content in the fuel was set at 10, 15, 25, and 49%. During combustion tests, flame visual were inspected, gas and particulate emissions were measured, individual losses and boiler efficiency were determined, and the amount and chemical composition of particulate depositions on boiler surfaces were estimated. Results indicate that burning fuel with char requires burner design modification to increase primary air relative to secondary air. Blends with up to 25% char content can be combusted while maintaining high boiler efficiency of approximately 87%, comparable to straw-only combustion. Significant fly ash deposits on boiler walls were observed, with K, Zn, Ca, and Si being predominant in the composition. Although there are risks of slagging and corrosion during co-combustion, these risks decrease with a higher char proportion. SO<span><math><msub><mrow></mrow><mrow><mn>2</mn></mrow></msub></math></span> was detected in the flue gases, with high levels of particulate emissions, while NOx emissions stayed within permissible limits for small boilers. A marked increase in unburned carbon in bottom ash suggests the need for grate modifications and an extended combustion zone when co-combusting biomass with waste rubber thermolysis char.</div></div>","PeriodicalId":419,"journal":{"name":"Renewable Energy","volume":"239 ","pages":"Article 121948"},"PeriodicalIF":9.0,"publicationDate":"2024-11-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142759342","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}