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1. Online chiller loading strategy based on the near-optimal performance map for energy conservation

Author:
Wang, Yijun; Jin, Xinqiao; Shi, Wantao; Wang, Jiangqing
Source:
Applied energy 2019 v.238 pp. 1444-1451
ISSN:
0306-2619
Subject:
energy; energy conservation,   etc   ; cooling;     Show all 3 Subject
Abstract:
... This paper develops an online control strategy for the multiple chillers with constant flow of cooling water and chilled water (primary side). The strategy is based on the performance map which indicates the chillers’ near-optimal control to save their energy consumption. The map is formed with diversified data sources and updated periodically to ensure its good quality. Two simulation studies are ...
DOI:
10.1016/j.apenergy.2019.01.170

2. From import dependence to self-sufficiency in Denmark, 1945−2000

Author:
Rüdiger, Mogens
Source:
Energy policy 2019 v.125 pp. 82-89
ISSN:
0301-4215
Subject:
energy; energy resources,   etc   ; imports; Denmark;     Show all 4 Subjects
Abstract:
... The aim of this article is to examine the shifting strategies towards the dependence on imported energy which has originated from the lack of energy resources in Denmark. The article suggests that the international economic conditions strongly influenced the energy strategies chosen in the 1950s and 1960s. In the 1970s and onwards, the dependence was dealt with as a combination of diversification ...
DOI:
10.1016/j.enpol.2018.10.050

3. The gap between energy policy challenges and model capabilities

Author:
Savvidis, Georgios; Siala, Kais; Weissbart, Christoph; Schmidt, Lukas; Borggrefe, Frieder; Kumar, Subhash; Pittel, Karen; Madlener, Reinhard; Hufendiek, Kai
Source:
Energy policy 2019 v.125 pp. 503-520
ISSN:
0301-4215
Subject:
energy; energy policy,   etc   ; funding; models;     Show all 4 Subjects
Abstract:
... Ambitious decarbonization targets, technology-specific policies, and computational developments led to increases in the complexity and diversity of energy system models. The lack of transparency and standardization, however, renders the assessment of model suitability for specific policy questions difficult. Therefore, this paper systematically assesses the ability of energy system models to answe ...
DOI:
10.1016/j.enpol.2018.10.033

4. Inequality of opportunity in energy consumption in China

Author:
Shi, Xinjie
Source:
Energy policy 2019 v.124 pp. 371-382
ISSN:
0301-4215
Subject:
energy; energy policy,   etc   ; females; China;     Show all 4 Subjects
Abstract:
... This paper proposes an empirical implementation of the concept of inequality of opportunity in energy consumption expenditure and applies this to data from Chinese General Social Survey (CGSS). We examine the role played by circumstances beyond the control of individuals—for instance, gender, hukou status, family background and region of birth—in generating inequality in energy consumption expendi ...
DOI:
10.1016/j.enpol.2018.09.029

5. On the possibilities to increase energy efficiency of domestic hot water preparation systems in existing buildings – Long term field research

Author:
Cholewa, Tomasz; Siuta-Olcha, Alicja; Anasiewicz, Rafał
Source:
Journal of cleaner production 2019 v.217 pp. 194-203
ISSN:
0959-6526
Subject:
energy balance; energy conservation; energy efficiency,   etc   ; buildings; heat; temperature; winter;     Show all 7 Subjects
Abstract:
... Energy consumption for domestic hot water (DHW) preparation is one of the main components of the energy balance of the existing and newly designed buildings. However, based on the number of existing buildings and the related opportunities to improve energy efficiency, an important issue is to propose effective and low cost methods that allow to reduce the heat consumption in existing domestic hot ...
DOI:
10.1016/j.jclepro.2019.01.138

6. The Relevance of Attitudinal Factors for the Acceptance of Energy Policy Measures: A Micro-econometric Analysis

Author:
Ziegler, Andreas
Source:
Ecological economics 2019 v.157 pp. 129-140
ISSN:
0921-8009
Subject:
energy; energy costs; energy policy,   etc   ; econometrics; models; politics; surveys;     Show all 7 Subjects
Abstract:
... This paper empirically examines the individual support of the German energy transition in total and especially of six single energy policy measures, which are components of the energy transition. Our micro-econometric analysis with binary and ordered probit models on the basis of data from a broad survey of citizens reveals the important role of several attitudinal factors. With respect to our ind ...
DOI:
10.1016/j.ecolecon.2018.11.001

7. Have China's provinces achieved their targets of energy intensity reduction? Reassessment based on nighttime lighting data

Author:
Zhang, Ping; Shi, XunPeng; Sun, YongPing; Cui, Jingbo; Shao, Shuai
Source:
Energy policy 2019 v.128 pp. 276-283
ISSN:
0301-4215
Subject:
energy; energy conservation,   etc   ; issues and policy; China;     Show all 4 Subjects
Abstract:
... Energy intensity has been a major assessment indicator in the design of energy saving policies, and it is one of the eight binding indicators of the target responsibility system for officials’ performance evaluation in the 11th Five-Year Plan in China. However, the accuracy of measurement of energy intensity depends to a large extent on the reliability of GDP data. This paper revises the GDP growt ...
DOI:
10.1016/j.enpol.2019.01.014

8. Pressure retarded osmosis: Operating in a compromise between power density and energy efficiency

Author:
Long, Rui; Lai, Xiaotian; Liu, Zhichun; Liu, Wei
Source:
Energy 2019 v.172 pp. 592-598
ISSN:
0360-5442
Subject:
energy efficiency; energy policy,   etc   ; models; osmosis; salinity;     Show all 5 Subjects
Abstract:
... Pressure retarded osmosis (PRO) is a promising technology for salinity gradient energy utilization. Here, based on previous literature, we proposed a simplified model to describe the PRO process, which was validated by a great accordance with the experimental data of water flux and power density. A sensitivity analysis of the PRO system indicated that there exist different optimal hydraulic pressu ...
DOI:
10.1016/j.energy.2019.01.169

9. A comprehensive evaluation of the development and utilization of China's regional renewable energy

Author:
Yu, Shiwei; Zheng, Yali; Li, Longxi
Source:
Energy policy 2019 v.127 pp. 73-86
ISSN:
0301-4215
Subject:
energy; renewable energy sources,   etc   ; power generation; China;     Show all 4 Subjects
Abstract:
... This study proposes comprehensive evaluation criteria, involving aspects of energy, economy, environment, technology, and society (E3TS), for the development and utilization of renewable energy (RE). The criteria consist of 22 indicators. The comprehensive performance, from 2011 to 2015, of 30 provincial regions in China with respect to renewable energy development and utilization (REDU) was evalu ...
DOI:
10.1016/j.enpol.2018.11.056

10. Impacts of stochastic forecast errors of renewable energy generation and load demands on microgrid operation

Author:
Chen, Yahong; Deng, Changhong; Yao, Weiwei; Liang, Ning; Xia, Pei; Cao, Peng; Dong, Yiwang; Zhang, Yuan-ao; Liu, Zhichao; Li, Dinglin; Chen, Man; Peng, Peng
Source:
Renewable energy 2019 v.133 pp. 442-461
ISSN:
0960-1481
Subject:
energy; renewable energy sources,   etc   ; models; variance;     Show all 4 Subjects
Abstract:
... Evaluating the impacts related to stochastic forecast errors (SFE) of renewable energy generation and load demands on the operation of micro grid is an important issue. In previous researches, the negative effects of SFE on micro grid are mainly focusing on power quality, system control, and operation, etc. The objective of this study is to investigate how SFE affects the operation stability of en ...
DOI:
10.1016/j.renene.2018.09.110

11. Optimization models to save energy and enlarge the operational life of water pumping systems

Author:
Torregrossa, Dario; Capitanescu, Florin
Source:
Journal of cleaner production 2019 v.213 pp. 89-98
ISSN:
0959-6526
Subject:
energy; energy conservation,   etc   ; algorithms; models; pumps;     Show all 5 Subjects
Abstract:
... Water pumping systems are widely used in industrial and civil applications. During their operational life, they consume energy and materials (mainly for installation and replacement of components). The aim of this paper is to optimize the pump operations in order to save energy and enlarge the operational life of the pumps and their components. This paper addresses the multi-period (e.g. 24-hours ...
DOI:
10.1016/j.jclepro.2018.12.124

12. Improving the benefits of demand response participation in facilities with distributed energy resources

Author:
Roldán-Blay, Carlos; Escrivá-Escrivá, Guillermo; Roldán-Porta, Carlos
Source:
Energy 2019 v.169 pp. 710-718
ISSN:
0360-5442
Subject:
energy; energy resources,   etc   ; algorithms; decision making;     Show all 4 Subjects
Abstract:
... Demand response has proven to be a distributed energy resource of great potential over the last decades for electrical systems operation. However, small or medium size facilities generally have a very limited ability to participate in demand response programs. When a facility includes several generation resources, energy storage systems, or even demand flexibility, the decision-making becomes cons ...
DOI:
10.1016/j.energy.2018.12.102

13. Smart distribution system management considering electrical and thermal demand response of energy hubs

Author:
Davatgaran, Vahid; Saniei, Mohsen; Mortazavi, Seyed Saeidollah
Source:
Energy 2019 v.169 pp. 38-49
ISSN:
0360-5442
Subject:
energy; energy costs,   etc   ; models; uncertainty; wind power;     Show all 5 Subjects
Abstract:
... Employing active elements such as energy hubs in energy management of distribution grid requires smart management strategies. In this paper, a demand response strategy for distribution grid management is proposed in which the distribution system operator (DSO) uses the flexibility of energy hubs in a demand response format to improve the operation. Moreover, it also provides benefits for energy hu ...
DOI:
10.1016/j.energy.2018.12.005

14. Study on force and wave energy conversion efficiency of buoys in low wave energy density seas

Author:
Chen, Fei; Duan, Derong; Han, Qing; Yang, Xuefeng; Zhao, Fang
Source:
Energy conversion and management 2019 v.182 pp. 191-200
ISSN:
0196-8904
Subject:
energy conversion; energy density,   etc   ; water power;     Show all 3 Subject
Abstract:
... The performance of wave energy converters is significantly affected by buoys. This research studied the force and conversion efficiency of buoys in low wave energy density seas and involved the selection of a cylindrical buoy and a hemispherical buoy, which were applied in a sealed-buoy wave energy converter (SBWEC). The underwater equivalent area was utilized as the variable to investigate the fo ...
DOI:
10.1016/j.enconman.2018.12.074

15. The co-movement between oil and clean energy stocks: A wavelet-based analysis of horizon associations

Author:
Maghyereh, Aktham I.; Awartani, Basel; Abdoh, Hussein
Source:
Energy 2019 v.169 pp. 895-913
ISSN:
0360-5442
Subject:
clean energy; energy,   etc   ; markets; oils; risk; wavelet;     Show all 6 Subjects
Abstract:
... The production of clean energy is crucial for protecting the environment and satisfying the future demand for energy. However, the growth in clean energy production and consumption is influenced by the developments in the oil and the clean energy technology markets. Thus, it is crucial to study the association among these markets and this is the main objective of this research. Compared to the exi ...
DOI:
10.1016/j.energy.2018.12.039

16. Heliostat field cleaning scheduling for Solar Power Tower plants: A heuristic approach

Author:
Ashley, Thomas; Carrizosa, Emilio; Fernández-Cara, Enrique
Source:
Applied energy 2019 v.235 pp. 653-660
ISSN:
0306-2619
Subject:
energy; solar energy,   etc   ; algorithms; cleaning; climate;     Show all 5 Subjects
Abstract:
... Soiling of heliostat surfaces due to local climate has a direct impact on their optical efficiency and therefore a direct impact on the productivity of the Solar Power Tower plant. Cleaning techniques applied are dependent on plant construction and current schedules are normally developed considering heliostat layout patterns, providing sub-optimal results. In this paper, a method to optimise clea ...
DOI:
10.1016/j.apenergy.2018.11.004

17. Analysis and optimization of a Dual Mass-Spring-Damper (DMSD) wave-energy convertor with variable resonance capability

Author:
Chen, Zhongfei; Zhang, Liang; Yeung, Ronald W.
Source:
Renewable energy 2019 v.131 pp. 1060-1072
ISSN:
0960-1481
Subject:
energy conversion; renewable energy sources,   etc   ; spring; storms;     Show all 4 Subjects
Abstract:
... To adapt to an ocean environment of changing wave period, a novel point-absorber concept is proposed: a fully-enclosed Dual Mass-Spring-Damper (DMSD) floater system that has an internal mass and spring so that its resonance frequency can be varied by changing the movable internal mass and spring. In a waterproof floater, this one-degree-of-freedom heaving energy converter can float or be submerged ...
DOI:
10.1016/j.renene.2018.07.006

18. Integration of a thermochemical energy storage system in a Rankine cycle driven by concentrating solar power: Energy and exergy analyses

Author:
Pelay, Ugo; Luo, Lingai; Fan, Yilin; Stitou, Driss; Castelain, Cathy
Source:
Energy 2019 v.167 pp. 498-510
ISSN:
0360-5442
Subject:
energy efficiency; solar energy,   etc   ; calcium oxide; exergy;     Show all 4 Subjects
Abstract:
... This paper proposes and investigates novel concepts on the integration of a thermochemical energy storage (TCS) system in a concentrating solar power (CSP) plant. The TCS material used is calcium oxide reacting with water and the power cycle studied is a Rankine cycle driven by CSP. Firstly, three integration concepts on the coupling of the TCS system with the Rankine cycle are proposed, including ...
DOI:
10.1016/j.energy.2018.10.163

19. Fostering the transition to sustainable electricity systems: A hierarchical analysis framework

Author:
Tziogas, Charalampos; Georgiadis, Patroklos; Papadopoulos, Agis
Source:
Journal of cleaner production 2019 v.206 pp. 51-65
ISSN:
0959-6526
Subject:
energy; renewable energy sources,   etc   ; decision making; electricity;     Show all 4 Subjects
Abstract:
... The aim of this research is to provide a comprehensive analysis framework for fostering the transition of electricity systems towards sustainability and energy security. In this sense, we first provide a critical taxonomy of extant studies, as these are mapped on strategic, tactical and operational levels of the hierarchical decision-making process. Sustainability constituents along with the consi ...
DOI:
10.1016/j.jclepro.2018.09.117

20. Multi-body interaction effect on the energy harvesting performance of a flapping hydrofoil

Author:
Lahooti, Mohsen; Kim, Daegyoum
Source:
Renewable energy 2019 v.130 pp. 460-473
ISSN:
0960-1481
Subject:
energy; renewable energy sources,   etc   ; kinematics; power generation;     Show all 4 Subjects
Abstract:
... The effect of an upstream bluff body on energy harvesting performance of a heaving and pitching hydrofoil is investigated numerically using a two-dimensional immersed boundary method at Re=1000. The presence of the upstream body changes flow structure around the hydrofoil and enhances efficiency significantly by two mechanisms. Mutual interaction of the vortex shed from the upstream body and the l ...
DOI:
10.1016/j.renene.2018.06.054