Renewable Energy最新文献

{"title":"Influence of control strategy on the energetic performance of an air source heat pump coupled with a solar air collector for domestic hot water in a cold climate","authors":"Sheel Bhadra,&nbsp;Aggrey Mwesigye","doi":"10.1016/j.renene.2025.122682","DOIUrl":"10.1016/j.renene.2025.122682","url":null,"abstract":"<div><div>Air source heat pumps (ASHPs) are becoming famous for heating applications, particularly in regions with moderate climatic conditions. However, in colder climates, their efficiency and capacity are reduced significantly and require high auxiliary heating loads. As such, coupling ASHPs with solar energy and energy storage is receiving considerable interest. This study investigates the performance of a solar-assisted air source heat pump for domestic hot water in an extremely cold climate. The operation of the air source heat pump (ASHP) is controlled based on the outdoor temperature and solar radiation. The rated capacity of the ASHP is 2 tons, while the rated minimum outdoor air temperature is −25°C. Since the heat pump capacity reduces at temperatures lower than −10°C, the potential improvement in performance when coupled with an SAC for a lower threshold of ambient temperatures between −10 and −25°C is evaluated. The designed control strategy also includes a lower threshold of solar radiation intensity, i.e. ≥300 W/m² or ≥200 W/m² or ≥100 W/m² or ≥0 W/m². In addition, the study explores the effect of recirculating air in the SAC on the overall heat pump performance. Results show that the coefficient of performance (COP) of the ASHP increases by 18%, and the heat pump fraction (HPF) is 94% when the heat pump is controlled to work for solar intensities greater than or equal to 300 W/m² and outdoor temperatures greater than or equal to −25°C. With the same limits, energy savings of 20% are realized. Moreover, the performance improves by 24% when air is recirculated in the SAC at the same conditions. This comprehensive analysis highlights the potential of the control strategy and air recirculation in ASHPs coupled with solar air collectors in cold climates.</div></div>","PeriodicalId":419,"journal":{"name":"Renewable Energy","volume":"244 ","pages":"Article 122682"},"PeriodicalIF":9.0,"publicationDate":"2025-02-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143453860","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}

{"title":"Tidal stream energy resource characterization for powering the blue economy applications for Southeastern Alaska","authors":"Matthew Willi Brand ,&nbsp;Yicheng Huang ,&nbsp;Zhaoqing Yang ,&nbsp;Taiping Wang","doi":"10.1016/j.renene.2025.122617","DOIUrl":"10.1016/j.renene.2025.122617","url":null,"abstract":"<div><div>Southeastern Alaska is a remote coastal region characterized by many narrow tidal channels with significant potential tidal energy resources due to the large tidal range (4–6 m). Southeastern Alaska communities struggle with power reliability and often rely upon expensive and polluting diesel generators for electricity. Tidal energy is a reliable and renewable source of power that could be used to augment the region’s power generation capacity. Previous regional-scale studies have found significant potential tidal energy resources in Southeastern Alaska; however, the resolution used in these studies is too coarse for detailed planning. In this study, we present a high-resolution (<span><math><mo>∼</mo></math></span>50 m at the finest mesh size), validated model of tidal hydrodynamics for characterizing tidal energy resources for Southeastern Alaska. We find a total of four different regions in both the northern and southern sections of Southeastern Alaska with high tidal energy power density, with Glacier Bay in the northern section having the highest power density of all sites (13,535 kW/m<span><math><msup><mrow></mrow><mrow><mn>2</mn></mrow></msup></math></span>). We also investigate use cases for tidal energy as a potential power source for isolated island communities to reduce their dependence on imported oil and as an onshore power source for cruise ships to reduce local particulate and carbon emissions while at port.</div></div>","PeriodicalId":419,"journal":{"name":"Renewable Energy","volume":"244 ","pages":"Article 122617"},"PeriodicalIF":9.0,"publicationDate":"2025-02-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143463877","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":"A straightforward process for conversion of de-oiled lemon grass (Cymbopogon citratus) waste into 5-hydroxymethylfurfural and furfural","authors":"Mahender Kumar ,&nbsp;Rohit Bains ,&nbsp;Arvind Singh Chauhan ,&nbsp;Ajay Kumar ,&nbsp;Pralay Das","doi":"10.1016/j.renene.2025.122657","DOIUrl":"10.1016/j.renene.2025.122657","url":null,"abstract":"<div><div>Herein, an efficient, eco-friendly, scalable, and one-pot method for selective production of 5-hydroxymethylfurfural (5-HMF) and furfural has been introduced by directly employing de-oiled lemon grass waste as a feedstock. The synergistic effects of maleic acid and HCl in tetrahydrofuran and sodium chloride saturated solution (THF: NaCl) solvent media have been first time investigated for lemon grass waste conversion into 5-HMF and furfural in a hydrothermal reactor system with 59 and 61 mol% yields respectively. The developed reagent system was also found to be applicable in various complex lignocellulosic biomass such as corn-cob, rice-straw, and sugarcane bagasse to procure 51–64 mol% of 5-HMF and 48–55 mol% furfural respectively. Moreover, the developed protocol was successfully applied to biomass conversion on a scale of 10.0 g, achieving good yields of the desired furanic compounds. Furthermore, Ultra-Performance Liquid Chromatography (UPLC) confirmed the purity of the compounds as &gt;90 % without adopting any tedious purification method.</div></div>","PeriodicalId":419,"journal":{"name":"Renewable Energy","volume":"244 ","pages":"Article 122657"},"PeriodicalIF":9.0,"publicationDate":"2025-02-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143473947","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":"Economic policy uncertainty and renewable energy transition: Assessing the impact of resource richness, environmental technology, and environmental governance","authors":"Cai Li ,&nbsp;Agyemang Kwasi Sampene ,&nbsp;John Wiredu ,&nbsp;Takyi Kwabena Nsiah","doi":"10.1016/j.renene.2025.122670","DOIUrl":"10.1016/j.renene.2025.122670","url":null,"abstract":"<div><div>The urgency of transitioning to renewable energy is a core priority under the United Nations Sustainable Development Goals (SDGs). However, economic policy uncertainty (EPU) remains a significant challenge in achieving a stable and sustained renewable energy transition (RET), particularly in resource-rich regions such as the Arctic Council countries (Sweden, the United States, Finland, Norway, Canada, Russia, and Denmark). Despite the wealth of literature on RET, research on the Arctic region remains scarce, particularly regarding the interplay between EPU, resource abundance, environmental technology, and governance. This research fills the gap by examining the impact of these factors on RET in the Arctic from 1990 to 2020, employing the Method of moment quantile regression (MMQR) approach to capture heterogeneous effects across different quantiles of RET distribution. The empirical findings reveal that a 1 % rise in economic policy uncertainty leads to a decline in RET between 0.287 % and 0.557 % across different quartiles, indicating a robust negative impact. Conversely, a 1 % increase in natural resource endowment (0.108 %–0.402 %), environmental technology (0.408 %–0.810 %), and environmental governance (0.216 %–0.633 %) enhances RET, with varying degrees of intensity across RET distributions. Additionally, the robustness analysis, conducted through DOLS and FMOLS, reaffirms the inverse and strong dynamics between economic policy uncertainty and RET, underscoring that policy instability disproportionately affects lower quantiles of RET. The policy implications are threefold. First, Arctic nations must implement stabilized and predictable economic policies to mitigate uncertainty, as fluctuations in economic policy hinder investment in renewable infrastructure. Second, policies should prioritize resource allocation towards clean energy development, ensuring that natural resource wealth is not solely invested into conventional energy sectors but redirected to facilitate RET. Lastly, enhancing environmental technology and governance frameworks through targeted investments and regulatory incentives will further accelerate the transition toward clean energy.</div></div>","PeriodicalId":419,"journal":{"name":"Renewable Energy","volume":"244 ","pages":"Article 122670"},"PeriodicalIF":9.0,"publicationDate":"2025-02-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143453864","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":"Efficient power generation through combined modified organic flash and dual-pressure organic rankine cycles: A comprehensive analysis from thermodynamic, exergoeconomic, and exergoenvironmental perspectives","authors":"Qing Wang,&nbsp;Meng Li,&nbsp;Zhenxia Wang","doi":"10.1016/j.renene.2025.122674","DOIUrl":"10.1016/j.renene.2025.122674","url":null,"abstract":"<div><div>The growing adoption of renewable energy sources in the power supply market emphasizes the need for efficient and environmentally friendly systems. This study presents an advanced setup combining a modified organic flash cycle with a dual-pressure organic Rankine cycle to enhance power generation efficiency. The flash cycle features a two-stage separation process, substituting an ejector with an expansion valve, while oil tanks stabilize the energy supply by storing excess thermal energy from solar collectors. A zeotropic mixture is utilized as the working fluid for the organic Rankine cycle, with multiple candidates evaluated under dynamic conditions. The system is analyzed from thermodynamic, exergoeconomic, and exergoenvironmental perspectives and subjected to multi-objective optimization. Results reveal that solar collectors are the largest contributors to exergy destruction, with a rate of 69.43 MW out of a total 79.24 MW. At the base operating mode, the setup achieves a net power generation of 17.64 MW, an exergy efficiency of 18.20 %, a cost rate of 848.39 $/h, and an exergoenvironmental impact rate of 64.87 Pt/h. Optimization under the exergy-economic scenario improves performance, achieving a net power generation of 17.78 MW, an exergy efficiency of 18.36 %, a cost rate of 834.73 $/h, and an exergoenvironmental impact rate of 66.35 Pt/h. The optimized design also yields a net present value of $65.38 million over the system's lifecycle. These findings highlight the system's potential for sustainable and cost-effective power generation.</div></div>","PeriodicalId":419,"journal":{"name":"Renewable Energy","volume":"244 ","pages":"Article 122674"},"PeriodicalIF":9.0,"publicationDate":"2025-02-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143436876","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":"Decarbonizing the G7: Renewable energy, economic growth, globalization, and policy Pathways to sustainability","authors":"Huangxin Chen ,&nbsp;Li Zhang ,&nbsp;Stefania Pinzon ,&nbsp;Hongxi Chen ,&nbsp;Bin Chen","doi":"10.1016/j.renene.2025.122671","DOIUrl":"10.1016/j.renene.2025.122671","url":null,"abstract":"<div><div>In light of the COP28 directive, which encourages G7 countries to intensify their emissions efforts that may contribute to accomplishing Sustainable Development Goals (SDGs). Given that, it is vital to investigate the link between renewable energy consumption (REC), research and development expenditure (RDE), globalization (GI), energy intensity (EI), and GDP on CO₂ emissions from 1990 to 2022. To achieve this goal, the study using a rigorous econometric methodology includes the Method of Moment Quantile Regression (MMQR), robustness confirmed by FMOLS, DOLS, and DKSE models, and Dumitrescu Hurlin (2012) Panel Causality tests. The most striking finding is that REC significantly reduces CO₂ emissions across all quantiles; GI, EI, and GDP increase emissions in different quantiles, thereby balancing economic growth, which is a complex challenge for environmental sustainability. In addition, FMOLS, DOLS and DKSE advocate the robustness of the outcome, whereas causality outcome revealed that REC-RDE and EI have a bidirectional causal association. These results highlight the important role of renewable energy investments and the importance of planning for the environmental impacts of globalization. This study makes a unique contribution to the literature by providing granular insights into the drivers of carbon emissions and actionable policy recommendations to achieve SDGs 7, 12, and 13 that are important and consistent with the goals of the COP28 agreement.</div></div>","PeriodicalId":419,"journal":{"name":"Renewable Energy","volume":"244 ","pages":"Article 122671"},"PeriodicalIF":9.0,"publicationDate":"2025-02-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143508978","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":"Dynamic modeling and comprehensive analysis of proton exchange membrane fuel cell systems with complete auxiliary system","authors":"Hao Fu ,&nbsp;Fang Kong ,&nbsp;Feng Wu ,&nbsp;Xiao Wu ,&nbsp;Jiong Shen","doi":"10.1016/j.renene.2025.122659","DOIUrl":"10.1016/j.renene.2025.122659","url":null,"abstract":"<div><div>Proton exchange membrane fuel cells are gaining attention as sustainable energy options due to their high efficiency and low emissions. However, the complex interaction of integrated auxiliary equipment poses challenges in achieving efficient and flexible system operation. To this end, this paper establishes an integrated mechanism of electrical, thermal, and humidity interactions in the fuel cell system, accounting for auxiliary energy consumption. Based on it, the steady state and dynamic flexibility of the system are investigated. Moreover, to analyze the changing law of energy consumption and system efficiency, the system's operating conditions were enumerated by varying the input variables, such as compressor voltage, humidification power, and coolant mass flow rate. Simulation results and comparative analysis indicate that appropriate load regulation and high-temperature operation significantly enhance the system's flexibility. With the increasing temperature at constant current, the energy consumption of the compressor increases by 0.6–4 %, whereas the proportion of cooling fans drops by 3–6 %. Moreover, although operating at high temperatures enhances the system's flexibility and load tracking capability, it also lowers its net efficiency by around 1 %. This research provides insights into improving flexible adjustment capability and efficiency of fuel cell systems, offering practical guidance for their application and development.</div></div>","PeriodicalId":419,"journal":{"name":"Renewable Energy","volume":"244 ","pages":"Article 122659"},"PeriodicalIF":9.0,"publicationDate":"2025-02-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143453861","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":"Identification of key renewable energy sectors for global energy transition based on industrial linkage analysis","authors":"Chao Feng,&nbsp;Guohao Pan,&nbsp;Jun Yang","doi":"10.1016/j.renene.2025.122651","DOIUrl":"10.1016/j.renene.2025.122651","url":null,"abstract":"<div><div>Recently, many countries have vigorously developed a variety of renewable energy to provide sufficient energy support for low-carbon development. The aim of this study is to identify the key renewable energy sectors (RWS) for global energy transition by using a global multi-regional input-output model and industrial linkage analysis. We found that: (1) the developments of RWS in global countries present different picture. Of these, RWS in Norway, Brazil, and India are the cleanest, while those in Belgium, Estonia, and Czech perform the worst; (2) there are disparities in key RWS in different countries. For example, for Russia, the key RWS are wind and geothermal energy sectors, while for Bulgaria it is the bioenergy sector, and for India they are the solar PV and the bioenergy sectors; (3) Among the renewable energy sources studied, bioenergy performs best; (4) as the sectors of non-metallic mineral products, production of electricity by coal, and mining of fuel are closely linked to RWS, further carbon emissions reduction requires coordinated management of key RWS and these sectors. To transit to a sustainable energy system, decision makers need to introduce systematic policy guidelines for these key sectors identified.</div></div>","PeriodicalId":419,"journal":{"name":"Renewable Energy","volume":"245 ","pages":"Article 122651"},"PeriodicalIF":9.0,"publicationDate":"2025-02-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143528677","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":"Performance, energy and exergy analysis of solar-assisted heat pump drying system with heat recovery: A comprehensive experimental study","authors":"Muchi Yao ,&nbsp;Ming Li ,&nbsp;Yi Zhang ,&nbsp;Yunfeng Wang ,&nbsp;Guoliang Li ,&nbsp;Ying Zhang ,&nbsp;Zhihan Deng ,&nbsp;Tianyu Xing ,&nbsp;Yinlong Zhu","doi":"10.1016/j.renene.2025.122665","DOIUrl":"10.1016/j.renene.2025.122665","url":null,"abstract":"<div><div>This study introduces an innovative solar-assisted heat pump drying (SAHPD) system incorporating multi-stage waste heat recovery technology to enhance energy efficiency, environmental sustainability, and economic feasibility for diverse drying applications. Through comprehensive experimental analysis under solar drying (SD), heat pump drying (HPD), and SAHPD modes, the SAHPD system achieved the highest performance metrics. The average coefficient of performance (COP) in SAHPD mode reached 2.49, a 34.59 % improvement over the HPD mode without heat recovery (1.85). Notably, the multi-stage heat recovery system demonstrated significant advantages, with a heat recovery rate of 5040.69 kJ/h, marking a 228.03 % increase compared to single-stage recovery. The condenser heating power increased from 8.83 kW to 10.93 kW, reflecting notable energy efficiency improvements. Additionally, the system's specific moisture extraction rate (SMER) was 1.53 kg/kWh, far surpassing HPD's 0.576 kg/kWh, highlighting its superior moisture extraction efficiency. The SAHPD system also proved highly cost-effective, with a payback period of just 0.97 years These results confirm the SAHPD system's potential as a sustainable, energy-efficient, and economically viable solution for agricultural products drying processes, setting a benchmark for integrating solar energy with heat recovery technologies.</div></div>","PeriodicalId":419,"journal":{"name":"Renewable Energy","volume":"244 ","pages":"Article 122665"},"PeriodicalIF":9.0,"publicationDate":"2025-02-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143464064","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":"Architectural and real-time monitoring design of multi-stage solar still for solar water purification","authors":"Qi Zhao ,&nbsp;Yumeng Wei ,&nbsp;Yawei Yang,&nbsp;Mengyuan Qiang,&nbsp;Linjing Fu,&nbsp;Yong Ma,&nbsp;Bowen Liu,&nbsp;Yihong Liu,&nbsp;Xuedong He,&nbsp;Wenxiu Que","doi":"10.1016/j.renene.2025.122660","DOIUrl":"10.1016/j.renene.2025.122660","url":null,"abstract":"<div><div>Multi-stage solar still with separated photothermal/evaporation interfaces have high energy utilization and water collection efficiency compared to widely reported single-stage upward solar interfacial evaporation. Despite progress, it still faces a \"black box\" issue regarding internal conditions like evaporation and salt accumulation due to its enclosed design. Herein, we developed a real-time operating status monitoring system for multi-stage solar stills with separated photothermal/evaporation interfaces. Firstly, we designed an optimal 5-stage solar still architecture with two-way water supply to achieve rapid water collection rate (1.72 L m⁻² h⁻¹ under 2.0 kW m⁻²) and desalination effects. Secondly, the optimal operating status (12 h of solar irradiation + 12 h of dark rinsing) was achieved through verification of different salinities and operating conditions. Finally, the resistance and temperature monitoring strategies applied to determine the operating status of multi-stage solar stills were explored: The water supply status, irradiation intensity, and salinity can be monitored by resistance change at the water supply inlet; and the salt precipitation status in the evaporation dead zone can be monitored by the temperature change at evaporation layer. This study holds significant value for implementing and optimizing multi-stage solar stills in solar desalination, offering insights into intelligent, automated operation and monitoring systems for enhanced sustainability.</div></div>","PeriodicalId":419,"journal":{"name":"Renewable Energy","volume":"244 ","pages":"Article 122660"},"PeriodicalIF":9.0,"publicationDate":"2025-02-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143436874","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}