Energy nexus最新文献_第7页

Thermal analysis and optimal fluid selection for the novel integrated vapor compression cycle and ORC system for ultra-low grade waste heat recovery using the desuperheating method

IF 8

Energy nexus Pub Date : 2024-12-29 DOI: 10.1016/j.nexus.2024.100357

Muhammad Asim , Sheheryar Khan , Shahid Ali Khan , Taha Baig , Muhammad Imran , Abdul Wasy Zia , Fahid Riaz , Michael K.H. Leung

{"title":"Thermal analysis and optimal fluid selection for the novel integrated vapor compression cycle and ORC system for ultra-low grade waste heat recovery using the desuperheating method","authors":"Muhammad Asim , Sheheryar Khan , Shahid Ali Khan , Taha Baig , Muhammad Imran , Abdul Wasy Zia , Fahid Riaz , Michael K.H. Leung","doi":"10.1016/j.nexus.2024.100357","DOIUrl":"10.1016/j.nexus.2024.100357","url":null,"abstract":"<div><div>This research investigates the thermal performance and working fluid selection from ultra-low-grade waste heat recovery. The study examines the desuperheating method of a novel integrated Vapor Compression Cycle (VCC) and the organic Rankine Cycle (ORC) system for electricity generation. Two cooling methods are analysed and compared, water-cooled VCC-water-cooled ORC and air-cooled VCC -air-cooled ORC. The study was conducted on a vapor compression system with 35-kW refrigeration capacity and evaluated various performance indices. The results indicate that for the water-water cooled system, R407c-R141b is the potential working fluid, achieving an overall coefficient of performance (COP<sub>sys</sub>) of 3.20, ORC thermal efficiency of 7.56 %, and net electricity output of 0.28 kW. R410a-R141b is recommended in the air-air-cooled system due to its higher ORC thermal efficiency (7.67 %) than the water-water-cooled system (7.56 %), resulting in a power output of 0.44 kW. Sensitivity analysis reveals that desuperheating is preferable for obtaining higher ORC thermal efficiency. Increasing the condensing water temperature improves net electricity and ORC thermal efficiency. Furthermore, a higher mass flow rate of condensing water enhances system COP and system exergy efficiency but decreases ORC thermal efficiency.</div></div>","PeriodicalId":93548,"journal":{"name":"Energy nexus","volume":"17 ","pages":"Article 100357"},"PeriodicalIF":8.0,"publicationDate":"2024-12-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143177887","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Carbon fiber from petroleum pitch: Current advances and potential applications

IF 8

Energy nexus Pub Date : 2024-12-26 DOI: 10.1016/j.nexus.2024.100355

Ajay Sharma , Mustafa M. Amin , Md Abdullah Al Bari , Mohammad M. Hossain , Muhammad N. Siddiquee

{"title":"Carbon fiber from petroleum pitch: Current advances and potential applications","authors":"Ajay Sharma , Mustafa M. Amin , Md Abdullah Al Bari , Mohammad M. Hossain , Muhammad N. Siddiquee","doi":"10.1016/j.nexus.2024.100355","DOIUrl":"10.1016/j.nexus.2024.100355","url":null,"abstract":"<div><div>Reducing production costs while meeting rising demand is a significant technological challenge for the carbon fiber industry. Carbon fiber (CF) is increasingly used in aviation, defense, and sports due to its lightweight, high tensile strength, chemical resistance, and temperature tolerance. The global demand for CF is projected to grow at an average annual rate of 10.3%. Currently, ∼90% of CF is produced using polyacrylonitrile (PAN) as a precursor, which is costly, with the precursor accounting for approximately 53% of the total production cost, limiting its use in medium to low-end markets. Conversely, heavy petroleum fractions like heavy vacuum gas oil and vacuum residue are inexpensive petroleum refinery wastes with significant potential for CF production. Developing and fabricating CF from low-value petroleum residues could be a viable alternative to reduce costs and meet growing demand. This review focuses on an organized and critical assessment of the application of low-grade CF derived from low value petroleum residues, life cycle assessment, production methodologies, influencing parameters, operative conditions, and properties of such CFs. The aim of this review article is to provide a general idea to the society that low value petroleum residue-based CF has diverse applications and can expedite the adoption of CF in medium to low-end industries because of cost benefits and it can also help to decarbonize the petrochemical industries.</div></div>","PeriodicalId":93548,"journal":{"name":"Energy nexus","volume":"17 ","pages":"Article 100355"},"PeriodicalIF":8.0,"publicationDate":"2024-12-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143177882","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Fruit and vegetable wastes as co-substrates in anaerobic co-digestion: Effect of storage temperature on physicochemical properties and biogas production

IF 8

Energy nexus Pub Date : 2024-12-25 DOI: 10.1016/j.nexus.2024.100354

André Azevedo , Nuno Lapa , Margarida Moldão , Jorge Gominho , Elizabeth Duarte

{"title":"Fruit and vegetable wastes as co-substrates in anaerobic co-digestion: Effect of storage temperature on physicochemical properties and biogas production","authors":"André Azevedo , Nuno Lapa , Margarida Moldão , Jorge Gominho , Elizabeth Duarte","doi":"10.1016/j.nexus.2024.100354","DOIUrl":"10.1016/j.nexus.2024.100354","url":null,"abstract":"<div><div>Global population growth has led to a significant increase in food waste, including Fruit and Vegetable Waste (FVW). Anaerobic co-digestion offers a sustainable way to valorise FVW, especially when combined with Municipal Sewage Sludge (MSS) to mitigate imbalances in their mono-digestion. This study investigates the effects of storage temperatures (10 °C and 25 °C, which represent Mediterranean climates with an Atlantic influence like Portugal) on the degradation of apple, carrot, and banana peels. Changes in physicochemical properties were assessed and anaerobic co-digestion batch assays with purées of fresh and stored FVW alongside MSS were performed. Results indicated that apple peels purées, at a 1:2 peel-to-water ratio, achieved over the double of volatile solids concentration compared to MSS, with each FVW type having a C/N ratio above 40. Storage at 10 °C significantly reduced the degradation of total and volatile solids, as well as chemical oxygen demand, with apple peels retaining the highest carbohydrate concentrations. Anaerobic co-digestion with fresh FVW boosted biogas and CH<sub>4</sub> production by 19.5% and 15.2%, respectively. FVW storage at 10 °C further enhanced CH<sub>4</sub> yield and decreased H<sub>2</sub>S content by 71% relative to MSS mono-digestion. These findings demonstrate that mild storage temperatures can improve biogas quality and yield by facilitating controlled FVW degradation.</div></div>","PeriodicalId":93548,"journal":{"name":"Energy nexus","volume":"17 ","pages":"Article 100354"},"PeriodicalIF":8.0,"publicationDate":"2024-12-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143177886","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Spatial and temporal grey water footprints of agricultural pesticide use: Improved pesticide use options to decrease water pollution in China 中国农业农药使用灰水足迹的时空特征：改进农药使用方案以减少水污染

IF 8

Energy nexus Pub Date : 2024-12-01 DOI: 10.1016/j.nexus.2024.100349

J. Yi , P.W. Gerbens-Leenes , M.M. Aldaya

{"title":"Spatial and temporal grey water footprints of agricultural pesticide use: Improved pesticide use options to decrease water pollution in China","authors":"J. Yi , P.W. Gerbens-Leenes , M.M. Aldaya","doi":"10.1016/j.nexus.2024.100349","DOIUrl":"10.1016/j.nexus.2024.100349","url":null,"abstract":"<div><div>Pesticides cause environmental and health risks. This study estimates the spatial-temporal dynamics of water pollution by pesticides and strategies for improvement. It uses the grey water footprint (WF) to identify the most polluting crops, hotspots and periods of increased water pollution with China as the case study area. It also proposes a temporal grey WF dimension due to pesticide degradation. The study used agricultural information for the period 2011–2015 from farmer surveys. The results showed that grey WFs were three times larger in summer than in winter. Hotspots were the North China Plain and Northeast China. Maize with herbicide (acetochlor) and insecticide (cypermethrin) use contributed most. In winter, the grey WFs in Southern regions were dominated by fungicide mancozeb use for vegetables and fruits. The temporal analysis of the grey WF due to pesticide degradation shows that the maximum daily grey WF was 66 % smaller than values based on the traditional calculation method. Moreover, replacing the most polluting pesticides, mancozeb, cypermethrin and acetochlor, can contribute to 20∼90 % of grey WF reduction across regions and months. Agriculture and policymakers can use this information to reduce pesticide-related water pollution.</div></div>","PeriodicalId":93548,"journal":{"name":"Energy nexus","volume":"16 ","pages":"Article 100349"},"PeriodicalIF":8.0,"publicationDate":"2024-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142748305","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Sustainable business assessment of the gasification of solid recovered fuel for bread making

IF 8

Energy nexus Pub Date : 2024-12-01 DOI: 10.1016/j.nexus.2024.100326

Ziyad Tariq Abdullah

{"title":"Sustainable business assessment of the gasification of solid recovered fuel for bread making","authors":"Ziyad Tariq Abdullah","doi":"10.1016/j.nexus.2024.100326","DOIUrl":"10.1016/j.nexus.2024.100326","url":null,"abstract":"<div><div>Solid recovered fuel (SRF) is an alternative to fossil fuels that is produced from recovered municipal solid waste. SRF is often used to provide heat for energy-intensive industries, such as cement production. Here, the alternative use of SRF for industrial bread production is proposed for the first time. Five industrial bread-making portfolios based on SRF gasification were developed based on commercially available industrial machinery and technology. The developed industrial-scale alternatives were subjected to the cost and profit feasibility analyses to quantify their economic sustainability. The technical feasibility of SRF-fueled bread making was mathematically modelled considering the maturity of the industrial machinery. Regression plots were used to analyze the effects of the productivity (manufacturing scale) on the cost, power, syngas consumption, number of workers, and delivery cost of these relationships. Good consistency between the data in these plots, i.e., the machinery specifications, indicates a high level of technical maturity. Furthermore, the social sustainability was calculated based on the technical, employment, and human development potentials, where automated bread-making lines increase productivity, but reduce the required number of workers. Finally, a comprehensive sustainability performance index was evaluated by combining the technical, economic, environmental, and social indexes. The final sustainability index of 0.65 is very close to the threshold for a sustainable profitable business. The economic analysis showed that a maximum profit of 36,718 USD/day can be achieved based on the production of 1.5 t/h of bread, where cost can be lowered to 1630 USD/t by using SRF. Replacing traditional fossil-based gas fuels (liquid petroleum gas and liquid natural gas) by SRF-derived gas has both economic and environmental advantages, resulting in high economic and environmental sustainability indexes.</div></div>","PeriodicalId":93548,"journal":{"name":"Energy nexus","volume":"16 ","pages":"Article 100326"},"PeriodicalIF":8.0,"publicationDate":"2024-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143172654","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

The nexus between fossil energy markets and the effect of the COVID-19 pandemic on clustering structures 化石能源市场与COVID-19大流行对集群结构的影响之间的关系

IF 8

Energy nexus Pub Date : 2024-12-01 DOI: 10.1016/j.nexus.2024.100344

Salim Lahmiri

{"title":"The nexus between fossil energy markets and the effect of the COVID-19 pandemic on clustering structures","authors":"Salim Lahmiri","doi":"10.1016/j.nexus.2024.100344","DOIUrl":"10.1016/j.nexus.2024.100344","url":null,"abstract":"<div><div>The main purpose of this paper is to analyze price returns series to investigate causality between international fossil energy markets and the effect of the COVID-19 pandemic on their clustering structures. The sample period covers August 1993 to June 2023. The empirical results from Granger causality applied to tests show (<em>i</em>) no evidence of causality in both directions between Australian coal and Brent, and between Dubai crude oil and Australian coal, (<em>ii</em>) evidene of 52 unidirectional causal relationships across international fossil energy markets, and (<em>iii</em>) evidence of bidirectional causality between US gasoline and Brent, South African coal and Australian coal, Indonesian natural gas and Australian coal, Russian natural gas and Australian coal, and between South African coal and Russian natural gas. Besides, results from agglomerative hierarchical clustering show that the COVID-19 pandemic affected the structures in the clusters in fossil energy markets and increased the similarity between them. Overall, we provide insights about the connectedness and clustering among major international fossil energy markets to highlight important system dynamics that could be helpful for policy makers, traders and investors.</div></div>","PeriodicalId":93548,"journal":{"name":"Energy nexus","volume":"16 ","pages":"Article 100344"},"PeriodicalIF":8.0,"publicationDate":"2024-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142748307","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Understanding the new quality productive forces in the energy sector 认识能源领域新的优质生产力

IF 8

Energy nexus Pub Date : 2024-12-01 DOI: 10.1016/j.nexus.2024.100352

Lin Zhang

引用次数: 0

Does access to energy matter? Understanding the complex nexus among energy consumption, ICT, foreign direct investment and economic growth on carbon emissions in Sub-Saharan Africa

IF 8

Energy nexus Pub Date : 2024-11-30 DOI: 10.1016/j.nexus.2024.100346

Fortune Ganda , Manoj Panicker

{"title":"Does access to energy matter? Understanding the complex nexus among energy consumption, ICT, foreign direct investment and economic growth on carbon emissions in Sub-Saharan Africa","authors":"Fortune Ganda , Manoj Panicker","doi":"10.1016/j.nexus.2024.100346","DOIUrl":"10.1016/j.nexus.2024.100346","url":null,"abstract":"<div><div>Carbon emissions and energy accessibility have emerged as significant obstacles to society's sustainable growth. This study investigates the non-linear impact of access to energy on carbon emissions by constructing a fixed-panel double-threshold regression model. The analysis utilises data from 2000 to 2019, encompassing 45 countries in Sub-Saharan Africa. The results outline that by employing the proportion of the population with access to electricity as the threshold parameter, the initial phases of foreign direct investment significantly lower carbon emissions. However, the later stages of FDI demonstrate an attenuated significantly positive link with carbon emissions. Secondly, by using the population with access to electricity as the threshold factor, primary energy consumption develops a significant and positive relationship with emissions in the initial levels that becomes more robust in the later intervals. Moreover, economic growth generates a positive relationship with environmental quality. However, the association between ICT and emissions is insignificantly positive. The d-H causality test results prove a bi-directional causal link between economic growth and carbon emissions, primary energy use and environmental quality, as well as ICT and emissions. The research proposes a comprehensive strategy for achieving sustainable development in Sub-Saharan Africa. Policymakers may develop policies for promoting clean energy access, responsible use of information and communication technology (ICT) and attracting environmentally aware foreign investment by examining the derived outcomes of the relationship between energy access, ICT, foreign direct investment (FDI), economic growth effects, and carbon emissions.</div></div>","PeriodicalId":93548,"journal":{"name":"Energy nexus","volume":"17 ","pages":"Article 100346"},"PeriodicalIF":8.0,"publicationDate":"2024-11-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143177889","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Online non-intrusive load monitoring: A review

IF 8

Energy nexus Pub Date : 2024-11-30 DOI: 10.1016/j.nexus.2024.100348

David Cruz-Rangel , Carlos Ocampo-Martinez , Javier Diaz-Rozo

{"title":"Online non-intrusive load monitoring: A review","authors":"David Cruz-Rangel , Carlos Ocampo-Martinez , Javier Diaz-Rozo","doi":"10.1016/j.nexus.2024.100348","DOIUrl":"10.1016/j.nexus.2024.100348","url":null,"abstract":"<div><div>Significant progress has been achieved in managing energy consumption in the residential sector in recent years. However, the industrial sector requires better coverage due to its substantial challenges. Non-intrusive load monitoring (NILM) provides a solution for energy monitoring, enabling appliance tracking by observing only the aggregated energy consumption. The online information at the device level can offer deeper insights into the origin of energy consumption and facilitate the optimization of strategic load scheduling and demand management. Particularly in industrial settings, online NILM has become increasingly relevant, with potential benefits such as energy reduction, operational optimization, and improved productivity. This monitoring approach plays a crucial role in minimizing downtime, reducing maintenance costs, and extending the lifespan of industrial assets. This paper aims to contribute to this field by offering an overview of online disaggregation techniques. It begins with a contemporary review of NILM methodologies and examines techniques specifically designed for online applications. Additionally, the article details the hardware implementations associated with the discussed NILM approaches.</div></div>","PeriodicalId":93548,"journal":{"name":"Energy nexus","volume":"17 ","pages":"Article 100348"},"PeriodicalIF":8.0,"publicationDate":"2024-11-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143178351","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Price disorder and information content in energy and gold markets: The effect of the COVID-19 pandemic 能源和黄金市场的价格混乱与信息含量：COVID-19 大流行的影响

IF 8

Energy nexus Pub Date : 2024-11-27 DOI: 10.1016/j.nexus.2024.100343

Salim Lahmiri

{"title":"Price disorder and information content in energy and gold markets: The effect of the COVID-19 pandemic","authors":"Salim Lahmiri","doi":"10.1016/j.nexus.2024.100343","DOIUrl":"10.1016/j.nexus.2024.100343","url":null,"abstract":"<div><div>In this paper, we examine market efficiency in fossil energy and gold markets. Specifically, we study price disorder and information content in various energy markets and in gold market before and during the COVID-19 pandemic. The set of energy markets include West Texas Intermediate (WTI), Brent, natural gas, heating oil, and gasoline. For each market, we estimated the correlation dimension, Lyapunov exponent, and approximate entropy for periods before and during the pandemic. In this regard, we contribute to the literature by using different nonlinear features to provide a rich description of the nonlinear dynamics in price evolution before and during the pandemic, considering five various energy and gold markets, and examining a longer and recent period spanning from November 2017 to November 2022. The empirical results show that, during the pandemic, complexity increased in gold and natural gas markets, stability strongly decreased in WTI and natural gas markets, and irregularity obviously increased in gold market but decreased in all energy markets. Besides, heating oil and gasoline markets appear to be unaffected by the COVID-19 pandemic especially in terms of complexity and stability compared to WTI, Brent, and gas markets. We conclude that the gold market maybe not attractive compared to energy markets for investors and traders during the pandemic. Besides, heating oil and gasoline markets offer interesting investment opportunities during the world economic downturn caused the outbreak of the pandemic.</div></div>","PeriodicalId":93548,"journal":{"name":"Energy nexus","volume":"16 ","pages":"Article 100343"},"PeriodicalIF":8.0,"publicationDate":"2024-11-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142723784","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0