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1. Tip leakage vortex trajectory and dynamics in a multiphase pump at off-design condition

Author:
Shi, Guangtai; Liu, Zongku; Xiao, Yexiang; Li, Helin; Liu, Xiaobing
Source:
Renewable energy 2020 v.150 pp. 703-711
ISSN:
0960-1481
Subject:
energy; renewable energy sources,   etc   ; photography;     Show all 3 Subject
Abstract:
... Because of the clearance and pressure difference between the pressure side (PS) and the suction side (SS), the tip leakage flow developed and evolved into tip leakage vortex (TLV). The relationship between the swirling strength of TLV and the pressure difference between the PS and the SS was analyzed. The velocity distribution in the tip clearance was also investigated in a multiphase pump. The re ...
DOI:
10.1016/j.renene.2020.01.024

2. Approximate and exact algorithms for an energy minimization traveling salesman problem

Author:
Wang, Shijin; Liu, Ming; Chu, Feng
Source:
Journal of cleaner production 2020 v.249 pp. 119433
ISSN:
0959-6526
Subject:
energy; energy conservation,   etc   ; algorithms; transportation;     Show all 4 Subjects
Abstract:
... Energy saving is a great challenge for clean transportation. In this paper, we study the Energy Minimization Traveling Salesman Problem (EMTSP), which is a generation of the classical Traveling Salesman Problem (TSP), and an important theoretical basis and a special case of the Energy Minimization Vehicle Routing Problem (EMVRP). The objective of the studied problem is to minimize the sum of the p ...
DOI:
10.1016/j.jclepro.2019.119433

3. Decentralized optimization approaches for using the load flexibility of electric heating devices

Author:
Dengiz, Thomas; Jochem, Patrick
Source:
Energy 2020 v.193 pp. 116651
ISSN:
0360-5442
Subject:
energy; renewable energy sources,   etc   ; algorithms;     Show all 3 Subject
Abstract:
... Electric heating devices can provide the needed load flexibility for future energy systems with high shares of renewable energies. To exploit these flexibilities, the literature often suggests centralized scheduling-based optimization. However, centralized optimization has crucial drawbacks regarding complexity, privacy and robustness while uncoordinated decentralized optimization approaches yield ...
DOI:
10.1016/j.energy.2019.116651

4. Dynamic characteristics of load rejection process in a reversible pump-turbine

Author:
Liu, Quan-Zhong; Su, Wen-Tao; Li, Xiao-Bin; Zhang, Ya-Ning
Source:
Renewable energy 2020 v.146 pp. 1922-1931
ISSN:
0960-1481
Subject:
energy; renewable energy sources,   etc   ; torque;     Show all 3 Subject
Abstract:
... The dynamic behavior during load rejection process of a reversible pump-turbine is numerically investigated based on the dynamic grid method. For the dynamic characteristics, the external features like runner rotation speed, torque and flow rate are analyzed. Then the time-frequency characteristics of pressure fluctuations at different positions (like guide vane, vaneless space, runner inlet and d ...
DOI:
10.1016/j.renene.2019.08.038

5. Bitcoin’s energy consumption: Is it the Achilles heel to miner’s revenue?

Author:
Das, Debojyoti; Dutta, Anupam
Source:
Economics letters 2020 v.186 pp. 108530
ISSN:
0165-1765
Subject:
energy; energy costs,   etc   ; income; markets;     Show all 4 Subjects
Abstract:
... In this paper, we add a new dimension to the cryptocurrency literature by examining the relationship between Bitcoin’s energy consumption and miner’s revenue. By resorting to quantile and Markov regime switching regression, we report a negative association between these variables. Further, the negative impact is strongly significant when the miner’s revenues are low and volatile. Thus, the higher ...
DOI:
10.1016/j.econlet.2019.108530

6. Influence of hard marine fouling on energy harvesting from Vortex-Induced Vibrations of a single-cylinder

Author:
Jadidi, P.; Zeinoddini, M.
Source:
Renewable energy 2020 v.152 pp. 516-528
ISSN:
0960-1481
Subject:
clean energy; energy transfer; renewable energy sources,   etc   ; biofouling; vibration;     Show all 5 Subjects
Abstract:
... Marine fouling changes the flow regime around sub-sea structures, such as Vortex-Induced Vibration Aquatic Clean Energy (VIVACE) converters. The present experimental study investigates the effects of marine fouling on mechanical power harvesting performance from the Vortex-Induced Vibration (VIV) of single circular cylinders. The towing tank VIV tests are conducted on elastically mounted rigid cyl ...
DOI:
10.1016/j.renene.2020.01.083

7. Conceptualising the Energy Constitution: Lessons from Northern Ireland

Author:
Muinzer, Thomas L.
Source:
Energy policy 2020 v.140 pp. 111408
ISSN:
0301-4215
Subject:
energy; energy policy; energy poverty,   etc   ; carbon; governance; territoriality; Northern Ireland;     Show all 7 Subjects
Abstract:
... In order to elucidate key aspects of the relationship between energy and constitutionality, Muinzer and Ellis (2017) have mapped the full spectrum of UK reserved/devolved constitutional powers and thrown into relief the complex form and nature of low carbon energy powers within that nexus. This low carbon-specific framework, and an understanding of its complex, contingent qualities and interconnec ...
DOI:
10.1016/j.enpol.2020.111408

8. What drive the changes in China's energy consumption and intensity during 12th Five-Year Plan period?

Author:
Yan, Junna; Su, Bin
Source:
Energy policy 2020 v.140 pp. 111383
ISSN:
0301-4215
Subject:
embodied energy; energy conservation; energy policy,   etc   ; household consumption; China;     Show all 5 Subjects
Abstract:
... During the 12th Five-Year Plan Period (2011–2015), the Chinese government has released a series of energy conservation plans to launch and deepen the transition in the energy use. Particularly, the dual control of the energy consumption and energy intensity was firstly emphasized. This paper intends to explore the targeted and effective energy policy implications through investigating the drivers ...
DOI:
10.1016/j.enpol.2020.111383

9. Citizen or consumer? Reconsidering energy citizenship

Author:
Lennon, Breffní; Dunphy, Niall; Gaffney, Christine; Revez, Alexandra; Mullally, Gerard; O’Connor, Paul
Source:
Journal of environmental policy & planning 2020 v.22 no.2 pp. 184-197
ISSN:
1522-7200
Subject:
energy; energy use and consumption; renewable energy sources,   etc   ; females;     Show all 4 Subject
Abstract:
... The transition to more sustainable energy systems has set about redefining the social roles and responsibilities of citizens. Implicit in this are expectations around participation, though the precise contours of what this might mean remain open. Debates around the energy transition have been skewed towards a normative construct of what it means to be a ‘good citizen’, the parameters for which are ...
DOI:
10.1080/1523908X.2019.1680277

10. A new measure of Italian hidden energy poverty

Author:
Betto, Frida; Garengo, Patrizia; Lorenzoni, Arturo
Source:
Energy policy 2020 v.138 pp. 111237
ISSN:
0301-4215
Subject:
energy efficiency; energy expenditure; energy poverty,   etc   ; buildings; climate; households;     Show all 6 Subjects
Abstract:
... As highlighted by European policymakers and academic research, the global economic crisis of 2008 emphasized the energy poverty phenomenon. A number of households have had to considerably reduce their energy expenditure but the traditional criteria adopted to calculate energy poverty are not able to measure their number.Placed in this framework, the paper aims to define a new measure of hidden ene ...
DOI:
10.1016/j.enpol.2019.111237

11. Operation strategy of interconnected combined cooling, heating, and power systems based on exergoeconomic analysis

Author:
Liu, Hao; Sui, Jun; Han, Wei; Wang, Zefeng; Zhang, Na
Source:
Journal of cleaner production 2020 v.245 pp. 118822
ISSN:
0959-6526
Subject:
energy; energy conservation; energy costs,   etc   ; cooling; operating costs; prices;     Show all 6 Subjects
Abstract:
... An operation strategy of interconnected combined cooling, heating, and power (CCHP) systems is proposed. The energy production price is determined using an exergoeconomic analysis. The systems can exchange cooling, heating, and power energy with each other according to the energy price. Moreover, the energy saving ratio and operation costs are examined in a detailed analysis of the off-design perf ...
DOI:
10.1016/j.jclepro.2019.118822

12. A cost-energy based methodology for small-scale linear Fresnel reflectors on flat roofs of urban buildings

Author:
Bayón-Cueli, C.; Barbón, A.; Bayón, L.; Barbón, N.
Source:
Renewable energy 2020 v.146 pp. 944-959
ISSN:
0960-1481
Subject:
energy; energy costs; renewable energy sources,   etc   ; algorithms; buildings; urban areas;     Show all 6 Subjects
Abstract:
... This paper proposes a new methodology for determining the geometrical parameters and the optimal distribution of small-scale linear Fresnel reflectors on flat roofs of urban buildings. This engineering problem is highly complex as it involves 21 variables; in contrast to present-day studies available in the literature, our method provides a global solution. The algorithm involves several stages, i ...
DOI:
10.1016/j.renene.2019.07.005

13. Hybrid pumped hydro and battery storage for renewable energy based power supply system

Author:
Javed, Muhammad Shahzad; Zhong, Dan; Ma, Tao; Song, Aotian; Ahmed, Salman
Source:
Applied energy 2020 v.257 pp. 114026
ISSN:
0306-2619
Subject:
energy balance; energy flow; renewable energy sources,   etc   ; batteries; models;     Show all 5 Subjects
Abstract:
... It is very challenging for single energy storage to make an off-grid renewable energy (RE) system that is fully capable and reliable, unless there are an oversized generator and storage capacities which eventually lead to high dump load, due to high variability and intermittency of RE resources. In this study, a hybrid pumped and battery storage (HPBS) system is proposed to make the off-grid RE sy ...
DOI:
10.1016/j.apenergy.2019.114026

14. Design and thermodynamic analysis of a novel solar CPV and thermal combined system utilizing spectral beam splitter

Author:
Wang, Gang; Yao, Yubo; Lin, Jianqing; Chen, Zeshao; Hu, Peng
Source:
Renewable energy 2020 v.155 pp. 1091-1102
ISSN:
0960-1481
Subject:
energy efficiency; solar energy,   etc   ; solar collectors; temperature;     Show all 4 Subjects
Abstract:
... A novel solar concentrating PV and thermal (CPVT) combined system with beam splitter and compact concentrator structure is proposed in this study. The system structure and its design method are provided. The optical filter is designed and the incident light angle effect on the beam splitting performance is investigated. Solar concentrating simulations are conducted and the relevant results reveal ...
DOI:
10.1016/j.renene.2020.04.024

15. Experimental and numerical investigations of a coupled-pitching hydrofoil under the fully-activated mode

Author:
Liu, Zhen; Qu, Hengliang; Zhang, Guoliang
Source:
Renewable energy 2020 v.155 pp. 432-446
ISSN:
0960-1481
Subject:
energy conversion; renewable energy sources,   etc   ; hydrodynamics; torque;     Show all 4 Subjects
Abstract:
... The aim of this paper is to experimentally and numerically study a coupled-pitching hydrofoil under the fully activated mode. In the experimental study, the operating zones for the energy-releasing state and the energy-capturing state were identified. The phase relationship between the hydrodynamic torque and the angular velocity, which is determined by the combination of the primary and secondary ...
DOI:
10.1016/j.renene.2020.03.162

16. Energy improvement of fineblanking press by valve-pump combined controlled hydraulic system with multiple accumulators

Author:
Xu, Zhicheng; Liu, Yanxiong; Hua, Lin; Zhao, Xinhao; Wang, Xiaokai
Source:
Journal of cleaner production 2020 v.257 pp. 120505
ISSN:
0959-6526
Subject:
energy conservation; energy efficiency,   etc   ; presses; simulation models;     Show all 4 Subjects
Abstract:
... To improve the useful energy efficiency of a hydraulic fine-blanking press (HFBP), a hydraulic system using a combined valve-pump combined with multiple accumulators and comprising a valve-controlled circuit and pump-controlled circuit, was presented based on the working-process load characteristics. By adopting multiple accumulators, the slide block mechanical energy was recycled and the system d ...
DOI:
10.1016/j.jclepro.2020.120505

17. Dimensionless model based on dual phase approach for predicting thermal performance of thermocline energy storage system: Towards a new approach for thermocline thermal optimization

Author:
Filali Baba, Yousra; Al Mers, Ahmed; Ajdad, Hamid
Source:
Renewable energy 2020 v.153 pp. 440-455
ISSN:
0960-1481
Subject:
energy; renewable energy sources,   etc   ; models; prediction;     Show all 4 Subjects
Abstract:
... The focus of this study is the development of a dimensionless model that allows a better understanding of the thermocline storage system behavior. The proposed model is based on a dual phase approach. We had identified four remarkable dimensionless groups of parameters which control the thermocline system performances. The influence of each dimensionless group of parameters has been analyzed separ ...
DOI:
10.1016/j.renene.2020.01.102

18. Italian protocol for massive solar integration: Imbalance mitigation strategies

Author:
Pierro, Marco; Perez, Richard; Perez, Marc; Moser, David; Cornaro, Cristina
Source:
Renewable energy 2020 v.153 pp. 725-739
ISSN:
0960-1481
Subject:
energy; solar energy,   etc   ; batteries; models; solar farms;     Show all 5 Subjects
Abstract:
... This article proposes two strategies for the mitigation of power imbalances and related costs resulting from increasing PV penetration onto the Italian grid. New “state of the art” solar and netload day ahead forecast models were developed and applied to real data.These strategies consist of:(1) Improving the accuracy of PV and net load power forecast and enlarging the footprint of the controlled ...
DOI:
10.1016/j.renene.2020.01.145

19. Pressure fluctuations in vaneless space of pump-turbines with large blade lean runners in the S- shaped region

Author:
Ma, Zhe; Zhu, Baoshan
Source:
Renewable energy 2020 v.153 pp. 1283-1295
ISSN:
0960-1481
Subject:
energy; renewable energy sources,   etc   ; blades; mathematical models;     Show all 4 Subjects
Abstract:
... A pumped hydro storage energy station (PHES) is an effective and reliable station which was quickly develop. To obtain better performances, blade leans have been employed recently on pump-turbine runners. To figure out the effect of the blade leans in turbine mode, numerical simulations were performed on two blade-leaned and no-leaned runners in this work. Because blade leans were on high-pressure ...
DOI:
10.1016/j.renene.2020.02.097

20. Recent advances in self-actuation and self-sensing materials: State of the art and future perspectives

Author:
Liu, Yushu; Zhong, Yunhao; Wang, Chengyin
Source:
Talanta 2020 v.212 pp. 120808
ISSN:
0039-9140
Subject:
energy; energy conservation,   etc   ; artificial intelligence; fossil fuels;     Show all 4 Subjects
Abstract:
... The contradiction between human's strong demand of fossil fuels and their limited reserves becomes increasingly severe. Without external power input, intelligent materials responding sharply and reversibly to various external stimuli are the topic of intense research these years, especially the self-actuation and self-sensing materials. The promising family of these materials will play a significa ...
DOI:
10.1016/j.talanta.2020.120808