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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. Energy efficiency improvement of heavy-load mobile hydraulic manipulator with electronically tunable operating modes

Author:
Ding, Ruqi; Zhang, Junhui; Xu, Bing; Cheng, Min; Pan, Min
Source:
Energy conversion and management 2019 v.188 pp. 447-461
ISSN:
0196-8904
Subject:
energy conservation; energy efficiency; potential energy,   etc   ; actuators;     Show all 4 Subject
Abstract:
... The conventional hydraulic drive system for a heavy-load mobile manipulator is usually operated under single mode, such that both inlet/outlet and potential energy losses are large to lower the energy efficiency. In this paper, a novel electro-hydraulic drive system is presented to improve energy efficiency. Extended control degrees of freedom are obtained utilizing the independent metering valve ...
DOI:
10.1016/j.enconman.2019.03.023

3. Triplet excitons: improving exciton diffusion length for enhanced organic photovoltaics

Author:
Luppi, Bruno T.; Majak, Darren; Gupta, Manisha; Rivard, Eric; Shankar, Karthik
Source:
Journal of materials chemistry A 2019 v.7 no.6 pp. 2445-2463
ISSN:
2050-7496
Subject:
energy conversion; solar energy,   etc   ; chemistry;     Show all 3 Subject
Abstract:
... A short exciton diffusion length (LD) is one of the main factors limiting the final power conversion efficiency (PCE) of organic photovoltaics (OPV). Aiming at overcoming this barrier, there have been studies on the use of longer-lived triplet excitons, which can be introduced either through triplet sensitization by doping or through the use of donor materials containing heavy atoms that allow for ...
DOI:
10.1039/c8ta10037c

4. 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

5. 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

6. 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

7. Real-time energy convex optimization, via electrical storage, in buildings – A review

Author:
Georgiou, Giorgos S.; Christodoulides, Paul; Kalogirou, Soteris A.
Source:
Renewable energy 2019 v.139 pp. 1355-1365
ISSN:
0960-1481
Subject:
energy efficiency; primary energy; renewable energy sources,   etc   ; batteries; buildings;     Show all 5 Subjects
Abstract:
... Energy in buildings covers a major and wide range of subject, which has attracted a great interest of the academic sector in recent years. Due to the high share of the global primary energy consumption associated with buildings, many studies have been published toward energy efficient buildings and the reduction of their primary energy consumption and energy management and optimization, for both R ...
DOI:
10.1016/j.renene.2019.03.003

8. 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

9. Numerical evaluation of compatibility between comfort and energy recovery based on energy flow mechanism inside electromagnetic active suspension

Author:
Gao, Zepeng; Chen, Sizhong; Zhao, Yuzhuang; Liu, Zheng
Source:
Energy 2019 v.170 pp. 521-536
ISSN:
0360-5442
Subject:
energy flow; energy recovery; kinetic energy,   etc   ; roughness; vibration;     Show all 5 Subjects
Abstract:
... The vibration energy of suspension system transformed from the driving kinetic energy has significant influence on vehicle performance during the driving process. Therefore, the analysis of energy flow mechanism inside the active suspension system is of great significance for the research of vehicle ride comfort and system energy recovery. In this paper, different control strategies for electromag ...
DOI:
10.1016/j.energy.2018.12.193

10. 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

11. An analysis of energy efficiency in Wireless Sensor Networks (WSNs) applied in smart agriculture

Author:
Banđur, Đoko; Jakšić, Branimir; Banđur, Miloš; Jović, Srđan
Source:
Computers and electronics in agriculture 2019 v.156 pp. 500-507
ISSN:
0168-1699
Subject:
energy conservation; energy efficiency; energy use and consumption,   etc   ; protocols;     Show all 4 Subject
Abstract:
... In this paper the usage of Wireless Sensor Networks (WSN) in smart agriculture applications was analyzed. The main focus of the paper is on the power consumption of the various WSN components, on the both levels, physical and functional. The analysis, from the energy efficiency aspect, includes a comparative review and discussion of the most commonly used protocols on the physical, data link and n ...
DOI:
10.1016/j.compag.2018.12.016

12. Dynamic mode decomposition of cavitating flow around ALE 15 hydrofoil

Author:
Liu, Ming; Tan, Lei; Cao, Shuliang
Source:
Renewable energy 2019 v.139 pp. 214-227
ISSN:
0960-1481
Subject:
energy; renewable energy sources,   etc   ; mathematical models;     Show all 3 Subject
Abstract:
... The Dynamic Mode Decomposition (DMD) and Proper Orthogonal Decomposition (POD) are employed to analyze the coherent structure of cavitating flow around ALE 15 hydrofoil. The snapshot data sequence is obtained from the numerical simulations by means of LES approach and modified Schnerr-Sauer cavitation model. Under cavitation number σ = 2.3, the cavitating flow around ALE 15 hydrofoil sheds at the ...
DOI:
10.1016/j.renene.2019.02.055

13. Dynamic mode decomposition of gas-liquid flow in a rotodynamic multiphase pump

Author:
Liu, Ming; Tan, Lei; Cao, Shuliang
Source:
Renewable energy 2019 v.139 pp. 1159-1175
ISSN:
0960-1481
Subject:
energy conversion; renewable energy sources,   etc   ; impellers;     Show all 3 Subject
Abstract:
... Rotodynamic multiphase pump is vital for energy conversion and oil-gas exploitation. In the present work, the complicated transient characteristics of gas-liquid two phase flow in a multiphase pump under 10% and 20% inlet GVFs are investigated by Dynamic Mode Decomposition (DMD). Results show that the strip-shaped gas volume develops in impeller and then leads to jet impingement at diffuser inlet, ...
DOI:
10.1016/j.renene.2019.03.015

14. A multi-objective iterated local search algorithm for comprehensive energy-aware hybrid flow shop scheduling

Author:
Schulz, Sven; Neufeld, Janis S.; Buscher, Udo
Source:
Journal of cleaner production 2019 v.224 pp. 421-434
ISSN:
0959-6526
Subject:
energy costs; energy efficiency,   etc   ; algorithms; industry; models;     Show all 5 Subjects
Abstract:
... Growing environmental awareness and the relevance of energy costs in many industries has led to the need of improving energy efficiency in operations management; hence, energy-aware scheduling (EAS) has grown in importance. In EAS three basic strategies can be identified. First, a large part of research activities is aimed at reducing energy consumption; second, energy costs can be reduced by maki ...
DOI:
10.1016/j.jclepro.2019.03.155

15. 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

16. Exploring the boundaries of Solar Home Systems (SHS) for off-grid electrification: Optimal SHS sizing for the multi-tier framework for household electricity access

Author:
Narayan, Nishant; Chamseddine, Ali; Vega-Garita, Victor; Qin, Zian; Popovic-Gerber, Jelena; Bauer, Pavol; Zeman, Miroslav
Source:
Applied energy 2019 v.240 pp. 907-917
ISSN:
0306-2619
Subject:
energy; solar energy,   etc   ; batteries; electricity; probability;     Show all 5 Subjects
Abstract:
... With almost 1.1 billion people lacking access to electricity, solar-based off-grid products like Solar Home Systems (SHS) have become a promising solution to provide basic electricity needs in un(der)-electrified regions. Therefore, optimal system sizing is a vital task as both oversizing and undersizing a system can be detrimental to system cost and power availability, respectively. This paper pr ...
DOI:
10.1016/j.apenergy.2019.02.053

17. Theoretical and experimental research on the thermal performance of ocean thermal energy conversion system using the rankine cycle mode

Author:
Chen, Fengyun; Liu, Lei; Peng, Jingping; Ge, Yunzheng; Wu, Haoyu; Liu, Weimin
Source:
Energy 2019
ISSN:
0360-5442
Subject:
energy conversion; thermal energy,   etc   ; mathematical models; temperature;     Show all 4 Subjects
Abstract:
... In this paper theoretical analysis of an ocean thermal energy conversion (OTEC) system was conducted using the Rankine cycle based on the first law of thermodynamics and a mathematical model of components of the system was established. Efficiencies of six types of working fluids were evaluated and compared under the uniform conditions. Finally a 15 kW OTEC plant using the Rankine cycle was constru ...
DOI:
10.1016/j.energy.2019.04.008

18. 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

19. 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

20. 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