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1. A challenge of incentive for small hydropower commercial investment in Thailand

Author:
Supriyasilp, Thanaporn; Pinitjitsamut, Montchai; Pongput, Kobkiat; Wanaset, Apinya; Boonyanupong, Suree; Rakthai, Saksri; Boonyasirikul, Thana
Source:
Renewable energy 2017 v.111 pp. 861-869
ISSN:
0960-1481
Subject:
guidelines; hydroelectric power; social benefit; tariffs; Thailand
Abstract:
... Thailand implemented a premium-price Feed-in Tariff (FIT), or ‘Adder’ program, in 2006 as an incentive to generate renewable energy. However, the Adder rate for hydropower was very low, and failed to motivate investors. Later, the Thai government decided to change the Adder program to a fixed-price FIT instead. As of 2014, no studies had analysed hydroelectric power rates in Thailand. Therefore, t ...
DOI:
10.1016/j.renene.2017.05.009

2. A CRO-species optimization scheme for robust global solar radiation statistical downscaling

Author:
Salcedo-Sanz, S.; Jiménez-Fernández, S.; Aybar-Ruiz, A.; Casanova-Mateo, C.; Sanz-Justo, J.; García-Herrera, R.
Source:
Renewable energy 2017 v.111 pp. 63-76
ISSN:
0960-1481
Subject:
algorithms; coral reefs; neural networks; prediction; radiometry; renewable energy sources; solar radiation; Spain
Abstract:
... This paper tackles the prediction of the global solar radiation (GSR) at a given point, using as predictive variables the outputs of a numerical weather model (the WRF meso-scale model) obtained at a different grid points. Prediction is obtained in this work using a Multilayer Perceptron (MLP) trained with Extreme Learning Machines (ELMs). Provided that the number of WRF outputs is vast, we propos ...
DOI:
10.1016/j.renene.2017.03.079

3. Aerodynamic stability of airfoils in lift-type vertical axis wind turbine in steady solver

Author:
Li, Jinyi; Cao, Yang; Wu, Guoqing; Miao, Zifan; Qi, Jiawei
Source:
Renewable energy 2017 v.111 pp. 676-687
ISSN:
0960-1481
Subject:
aerodynamics; renewable energy sources; wind turbines
Abstract:
... This paper presents a method examining static forces and moment of airfoil in steady solver. Aerodynamic stability is one subject that many scholars have begun to realize very crucial for design and daily operation. Fundamentals of aerodynamics were firstly scrutinized concerned about lift, drag and moment. Then steady simulation solver is set up instead of transient solver because we would like t ...
DOI:
10.1016/j.renene.2017.04.057

4. Analysis of the promotion of onshore wind energy in the EU: Feed-in tariff or renewable portfolio standard?

Author:
García-Álvarez, María Teresa; Cabeza-García, Laura; Soares, Isabel
Source:
Renewable energy 2017 v.111 pp. 256-264
ISSN:
0960-1481
Subject:
European Union; issues and policy; prices; tariffs; wind; wind power
Abstract:
... This paper provides an empirical evaluation of feed-in tariff and renewable portfolio standard policies applied to onshore wind power in the EU-28 over the period 2000–2014. It allows policy-makers to know: a) if these policies have actually increased onshore wind generation capacity compared to a scenario without regulatory supports, b) which policy led to most onshore wind generation capacity, c ...
DOI:
10.1016/j.renene.2017.03.067

5. An approach to the characterisation of the performance of a tidal stream turbine

Author:
Allmark, Matthew; Grosvenor, Roger; Prickett, Paul
Source:
Renewable energy 2017 v.111 pp. 849-860
ISSN:
0960-1481
Subject:
models; monitoring; renewable energy sources; torque; turbines; turbulent flow
Abstract:
... In order to better manage and maintain deployed Tidal Stream Turbine (TST) devices their response to complicated and severe loading mechanisms must be established. To aid this process the research presented details a methodology for mapping TST operational data, taken under a variety of operating conditions, to a set of model parameters. The parameter sets were developed based on a TST rotor torqu ...
DOI:
10.1016/j.renene.2017.05.010

6. A new fuzzy logic proportional controller approach applied to individual pitch angle for wind turbine load mitigation

Author:
Civelek, Zafer; Lüy, Murat; Çam, Ertuğrul; Mamur, Hayati
Source:
Renewable energy 2017 v.111 pp. 708-717
ISSN:
0960-1481
Subject:
blades; energy; fuzzy logic; renewable energy sources; wind speed; wind turbines
Abstract:
... In the world, efforts to increase the resource diversity in electric generation have accelerated lately. So, the great improvements have been achieved in wind turbines (WTs). The dimensions of WTs have grown for more electric generation and their energy productions have increased. Depending on these developments, it has become more important to reduce the WT load mitigation. Thus, a tendency to pa ...
DOI:
10.1016/j.renene.2017.04.064

7. A non-catalytic in situ process to produce biodiesel from a rice milling by-product using a subcritical water-methanol mixture

Author:
Zullaikah, Siti; Rahkadima, Yulia T.; Ju, Yi-Hsu
Source:
Renewable energy 2017 v.111 pp. 764-770
ISSN:
0960-1481
Subject:
biodiesel; carbon dioxide; free fatty acids; hydrolysis; methanol; rice; rice bran; rice bran oil; sugars; transesterification
Abstract:
... A non-catalytic method to produce biodiesel in situ from a rice milling by-product, i.e. rice bran, using subcritical water-methanol mixture has been investigated. The method was found to be unaffected by initial moisture and free fatty acids (FFA) contents in rice bran so that no pretreatment was required. The yield and purity of biodiesel were higher under CO2 atmosphere than those under N2 atmo ...
DOI:
10.1016/j.renene.2017.04.040

8. A novel Z-scheme Er3+:YAlO3/Ta2O5-CaIn2S4/MoSe2-reduced graphene oxide photocatalyst with superior photocatalytic hydrogen evolution activity

Author:
Wei, Shengnan; Song, Yahui; Rong, Yang; Tang, Liang; Chen, Yang; Lu, Chunxiao; Zhang, Zhaohong; Wang, Jun
Source:
Renewable energy 2017 v.111 pp. 628-637
ISSN:
0960-1481
Subject:
Raman spectroscopy; X-ray diffraction; X-ray photoelectron spectroscopy; aqueous solutions; energy-dispersive X-ray analysis; graphene oxide; hydrogen; hydrogen production; irradiation; methanol; photocatalysis; photocatalysts; photoluminescence; renewable energy sources; scanning electron microscopy; sol-gel processing; transmission electron microscopy; ultraviolet-visible spectroscopy
Abstract:
... Here, a high effective visible-ultraviolet up-conversion luminescence agent (Er³⁺:YAlO3) was synthesized and the Er³⁺:YAlO3/Ta2O5 composite was prepared by sol-gel method. The MoSe2-reduced graphene oxide (MoSe2-RGO) hybrid as co-catalyst was prepared by hydrothermal method. Afterwards, a new Z-scheme photocatalyst, Er³⁺:YAlO3/Ta2O5-CaIn2S4/MoSe2-RGO, was successfully assembled by hydrothermal met ...
DOI:
10.1016/j.renene.2017.04.022

9. A resistance type vertical axis wind turbine for building integration

Author:
Müller, Gerald; Chavushoglu, Mert; Kerri, Mark; Tsuzaki, Toru
Source:
Renewable energy 2017 v.111 pp. 803-814
ISSN:
0960-1481
Subject:
blades; buildings; geometry; models; wind power; wind speed; wind turbines; windmills
Abstract:
... The Persian or Sistan wind mill is possibly the oldest wind energy device. It consists of a vertical axis with six blades, and an outer shroud which encases half the rotor against the wind. The wind only acts on one half of the runner, providing the driving force. The efficiency of this machine was assumed to be between 5 and 14%, too low for practical application today. The concept however is int ...
DOI:
10.1016/j.renene.2017.05.017

10. Assessment of ultrasound-assisted extraction of crambe seed oil for biodiesel synthesis by in situ interesterification

Author:
Tavares, Gilmar Roberto; Massa, Thainara Bovo; Gonçalves, José Eduardo; da Silva, Camila; dos Santos, Wanderley Dantas
Source:
Renewable energy 2017 v.111 pp. 659-665
ISSN:
0960-1481
Subject:
acetates; biodiesel; catalytic activity; crambe seed oil; experimental design; free fatty acids; hexane; linoleic acid; seeds; solvents; temperature; ultrasonic treatment
Abstract:
... In this study, the effectiveness of the ultrasound-assisted extraction (UAE) of crambe seed oil was evaluated with the aim of biodiesel synthesis by in situ interesterification. An experimental design was applied, using a mixture of n-hexane and methyl acetate as the solvent, to evaluate the effect of the process variables and determine the conditions that maximize the removal of oil from the seed ...
DOI:
10.1016/j.renene.2017.04.065

11. Bio-based diluents improve cold flow properties of dairy washed milk-scum biodiesel

Author:
Srikanth, H.V.; Venkatesh, J.; Godiganur, Sharanappa; Venkateswaran, S.; Manne, Bhaskar
Source:
Renewable energy 2017 v.111 pp. 168-174
ISSN:
0960-1481
Subject:
acid value; biodiesel; crystallization; differential scanning calorimetry; feedstocks; fluid mechanics; industrial wastes; milk; pour point; temperature; viscosity
Abstract:
... There is a growing trend in utilizing biological industrial wastes to produce biofuels. The dairy washed milk scum (DWMS) is one of such potential industrial waste and can be used as feedstock for the production of biodiesel. One of the inherent problems of DWMS biodiesel is its poor low temperature property. In this investigation, the influence of two bio-based cold flow improvers (CFIs) namely, ...
DOI:
10.1016/j.renene.2017.03.092

12. Bioconversion of switchgrass: Identification of a leading pretreatment option based on yield, cost and environmental impact

Author:
Smullen, Emma; Finnan, John; Dowling, David; Mulcahy, Patricia
Source:
Renewable energy 2017 v.111 pp. 638-645
ISSN:
0960-1481
Subject:
Panicum virgatum; ammonia; biofuels; biotransformation; cellulose; cost effectiveness; environmental impact; ethanol; ethanol production; feedstocks; fermentation; glucose; markets; methanol; saccharification; sodium hydroxide; sulfuric acid
Abstract:
... Switchgrass (Panicum virgatum L) is considered to be one of the best feedstocks for second generation ethanol production. However, its use as a biofuel resource for the ethanol market is challenged by high investment costs and inconsistent production methodologies. This study explores the use of switchgrass as a potential feedstock for ethanol production, investigating the effects of different pre ...
DOI:
10.1016/j.renene.2017.04.059

13. Biocrude production via supercritical hydrothermal co-liquefaction of spent mushroom compost and aspen wood sawdust

Author:
Jasiūnas, Lukas; Pedersen, Thomas H.; Toor, Saqib S.; Rosendahl, Lasse A.
Source:
Renewable energy 2017 v.111 pp. 392-398
ISSN:
0960-1481
Subject:
Sphagnum; byproducts; citric acid; feedstocks; horse manure; leaching; liquefaction; mixing; mushroom growing; renewable energy sources; sawdust; spent mushroom compost; straw; wood
Abstract:
... The work investigates a new potential feedstock source for hydrothermal liquefaction (HTL) driven biocrude production. Specifically, the focus is set on utilizing spent mushroom compost (SMC), the primary waste by-product from mushroom farming. It is considered as a feedstock for HTL conversion due to its organic nature (e.g. straw, horse manure and sphagnum) and ample availability with an annual ...
DOI:
10.1016/j.renene.2017.04.019

14. Biomass for industrial applications: The role of torrefaction

Author:
Proskurina, Svetlana; Heinimö, Jussi; Schipfer, Fabian; Vakkilainen, Esa
Source:
Renewable energy 2017 v.111 pp. 265-274
ISSN:
0960-1481
Subject:
biofuels; biomass; coal; energy; heat production; industrial applications; markets; minerals; power generation; pulp and paper industry; steel; torrefaction
Abstract:
... Torrefied biomass has considerable potential as a biomass fuel to replace coal in energy and process heat production. The aim of this paper is to evaluate the potential of torrefied biomass in different industries, both power and non-power generation industries, and considers the impact of such use on the international biomass market. The power generation sector has been so far the leader in testi ...
DOI:
10.1016/j.renene.2017.04.015

15. Characterizing and analyzing ramping events in wind power, solar power, load, and netload

Author:
Cui, Mingjian; Zhang, Jie; Feng, Cong; Florita, Anthony R.; Sun, Yuanzhang; Hodge, Bri-Mathias
Source:
Renewable energy 2017 v.111 pp. 227-244
ISSN:
0960-1481
Subject:
algorithms; diurnal variation; economics; solar energy; wind power
Abstract:
... One of the biggest concerns associated with integrating a large amount of renewable energy into the power grid is the ability to handle large ramps in the renewable power output. For the sake of system reliability and economics, it is essential for power system operators to better understand the ramping features of renewables, load, and netload. In this paper, an optimized swinging door algorithm ...
DOI:
10.1016/j.renene.2017.04.005

16. Combining metabolic evolution and systematic fed-batch optimization for efficient single-cell oil production from sugarcane bagasse

Author:
Unrean, Pornkamol; Khajeeram, Sutamat; Champreda, Verawat
Source:
Renewable energy 2017 v.111 pp. 295-306
ISSN:
0960-1481
Subject:
biofuels; cost effectiveness; fermentation; hydrolysates; lipids; models; oils; process design; screening; sugarcane bagasse; yeasts
Abstract:
... We developed in this study an efficient production process of SCO from sugarcane bagasse hydrolysates using Y. lipolytica. We described a dynamic flux balance model strategy based on a genome-scale metabolic model of Y. lipolytica and SCO fermentation kinetics that applied for rational design of optimized fed-batch process with high single cell oil accumulation. Furthermore, metabolic evolution ap ...
DOI:
10.1016/j.renene.2017.04.018

17. Comparative experimental Life Cycle Assessment of two commercial solar thermal devices for domestic applications

Author:
Arnaoutakis, Nektarios; Souliotis, Manolis; Papaefthimiou, Spiros
Source:
Renewable energy 2017 v.111 pp. 187-200
ISSN:
0960-1481
Subject:
energy; environmental assessment; heat; heaters; life cycle assessment; renewable energy sources; temperature; thermal properties
Abstract:
... This paper presents the comparative study of two commercially available types of solar water heaters for domestic applications: Flat Plate Thermosyphonic Units (FPTU) and Integrated Collector Storage (ICS) solar water heaters. The conducted analysis initially focuses on the experimental investigation of the thermal behaviour and proceeds to the detailed holistic environmental analysis for both sys ...
DOI:
10.1016/j.renene.2017.04.008

18. Comparison of series/parallel configuration for a low-T geothermal CHP plant, coupled to thermal networks

Author:
Van Erdeweghe, Sarah; Van Bael, Johan; Laenen, Ben; D'haeseleer, William
Source:
Renewable energy 2017 v.111 pp. 494-505
ISSN:
0960-1481
Subject:
electric power; exergy; heat; power plants; renewable energy sources; temperature
Abstract:
... In this paper, the performance of a low-temperature (130 °C) geothermally-fed combined heat-and-power (CHP) plant coupled to third and fourth generation thermal networks is investigated. The series and parallel CHP configurations are compared based on an exergy analysis. Whether the series or the parallel CHP has the best performance depends on the thermal network requirements. The results are dis ...
DOI:
10.1016/j.renene.2017.04.031

19. Design and thermodynamic analysis of a solar-assisted cini ceramic drying system

Author:
Büyükakın, Mustafa Kemalettin; Öztuna, Semiha; Demir, Hakan
Source:
Renewable energy 2017 v.111 pp. 147-156
ISSN:
0960-1481
Subject:
air flow; ceramics; drying; energy conservation; energy costs; heat exchangers; kilns; pollution; solar collectors; solar energy; solar radiation; summer; temperature; thermodynamics
Abstract:
... Nowadays, solar-assisted systems have been identified as one of the best solutions to use in order to save energy in industrial processes. Energy costs and environmental pollution emanating from these proposed systems are unequivocally lower than conventional systems. In this study, a traditional Turkish cini ceramic drying kiln, with a daily capacity of 600 kg, was designed and analysed from a th ...
DOI:
10.1016/j.renene.2017.03.090

20. Design of new Ga-doped SrMoO3 perovskites performing as anode materials in SOFC

Author:
Cascos, V.; Troncoso, L.; Alonso, J.A.; Fernández-Díaz, M.T.
Source:
Renewable energy 2017 v.111 pp. 476-483
ISSN:
0960-1481
Subject:
X-radiation; X-ray diffraction; ambient temperature; anodes; crystal structure; electrical conductivity; electrochemistry; electrolytes; fuel cells; fuels; hydrogen; impedance; methane; oxides; renewable energy sources; thermal expansion
Abstract:
... We have designed and prepared SrMo1-xGaxO3-δ (x = 0.1 and 0.2) perovskite oxides. Their performance as anode materials in intermediate-temperature solid-oxide fuel cells (IT-SOFC) has been investigated. The characterization of these oxides included X-ray (XRD) and neutron powder diffraction (NPD) for x = 0.1 and 0.2. At room temperature, SrMo1-xGaxO3-δ perovskites are defined in the Pm-3m space gr ...
DOI:
10.1016/j.renene.2017.04.023