Special Issue "Select papers from International Conference on Renewable Energy—ICREN 2019"

A special issue of Energies (ISSN 1996-1073).

Deadline for manuscript submissions: closed (30 September 2019).

Special Issue Editor

Prof. Dr. Carlo Renno
Website
Guest Editor
Department of Industrial Engineering, University of Salerno, Via Giovanni Paolo II, 132, 84084 Fisciano (Salerno), Italy
Interests: thermal systems; refrigeration systems; solar energy; concentrating photovoltaic and thermal (CPV/T) systems; solar cooling
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Special Issue Information

Dear Colleagues,

Renewable Energy forms one of the pillars for delivering global sustainable environment and the commitment to climate change targets. The renewable energy industry has matured, with huge investments being ploughed into it globally. Global new investment in renewable energy (excluding large hydro-electric projects) was around US$241.6 billion in 2016, with over 138.5 GW of added renewable power capacity worldwide. This capacity is equivalent to 55% of all the generating capacity and was approximately double that in fossil fuel generation in 2016. The International Conference on Renewable Energy series addresses research and development in renewable energy technologies, including energy efficiency. It is an annual meeting planned to be held in different countries, initially within Europe, with Asia, the Middle East, Africa, and Latin America being highlighted as target regions for the conference.

The next in the series of the International Conference on Renewable Energy is the ICREN2019, focusing on international participation, including experienced and young researchers with an interest in renewable energy studies. The conference will be held at the UNESCO Headquarters in Paris, France on 24–26 April 2019 and will provide an unsurpassed venue to nurture debate in this globally important area.

ICREN2019 will include articles and presentations on the latest research on renewable energy technologies, grid interactions, energy efficiency, data analytics, economics and finance, environmental and social impact, as well as policy and climate change implications.

Prof. Carlo Renno
Guest Editor

Manuscript Submission Information

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Keywords

  • Renewable energy technologies—solar, wind, wave, tidal, geothermal, bioenergy, hydropower
  • Energy storage concepts and materials
  • Renewable energy integrations and energy networks
  • Innovation in energy efficiency and architecture
  • Energy access, gender, and development
  • Economics social and environmental and policy aspects
  • Energy and climate change

Published Papers (3 papers)

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Research

Open AccessArticle
Design and Optimization of a Multi-Element Hydrofoil for a Horizontal-Axis Hydrokinetic Turbine
Energies 2019, 12(24), 4679; https://doi.org/10.3390/en12244679 - 09 Dec 2019
Abstract
Hydrokinetic turbines are devices that harness the power from moving water of rivers, canals, and artificial currents without the construction of a dam. The design optimization of the rotor is the most important stage to maximize the power production. The rotor is designed [...] Read more.
Hydrokinetic turbines are devices that harness the power from moving water of rivers, canals, and artificial currents without the construction of a dam. The design optimization of the rotor is the most important stage to maximize the power production. The rotor is designed to convert the kinetic energy of the water current into mechanical rotation energy, which is subsequently converted into electrical energy by an electric generator. The rotor blades are critical components that have a large impact on the performance of the turbine. These elements are designed from traditional hydrodynamic profiles (hydrofoils), to directly interact with the water current. Operational effectiveness of the hydrokinetic turbines depends on their performance, which is measured by using the ratio between the lift coefficient (CL) and the drag coefficient (CD) of the selected hydrofoil. High lift forces at low flow rates are required in the design of the blades; therefore, the use of multi-element hydrofoils is commonly regarded as an adequate solution to achieve this goal. In this study, 2D CFD simulations and multi-objective optimization methodology based on surrogate modelling were conducted to design an appropriate multi-element hydrofoil to be used in a horizontal-axis hydrokinetic turbine. The Eppler 420 hydrofoil was utilized for the design of the multi-element hydrofoil composed of a main element and a flap. The multi-element design selected as the optimal one had a gap of 2.825% of the chord length (C1), an overlap of 8.52 %C1, a flap deflection angle (δ) of 19.765°, a flap chord length (C2) of 42.471 %C1, and an angle of attack (α) of –4°. Full article
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Open AccessArticle
Life Cycle Cost of Building Energy Renovation Measures, Considering Future Energy Production Scenarios
Energies 2019, 12(14), 2719; https://doi.org/10.3390/en12142719 - 16 Jul 2019
Cited by 4
Abstract
A common way of calculating the life cycle cost (LCC) of building renovation measures is to approach it from the building side, where the energy system is considered by calculating the savings in the form of less bought energy. In this study a [...] Read more.
A common way of calculating the life cycle cost (LCC) of building renovation measures is to approach it from the building side, where the energy system is considered by calculating the savings in the form of less bought energy. In this study a wider perspective is introduced. The LCC for three different energy renovation measures, mechanical ventilation with heat recovery and two different heat pump systems, are compared to a reference case, a building connected to the district heating system. The energy system supplying the building is assumed to be 100% renewable, where eight different future scenarios are considered. The LCC is calculated as the total cost for the renovation measures and the energy systems. All renovation measures result in a lower district heating demand, at the expense of an increased electricity demand. All renovation measures also result in an increased LCC, compared to the reference building. When aiming for a transformation towards a 100% renewable system in the future, this study shows the importance of having a system perspective, and also taking possible future production scenarios into consideration when evaluating building renovation measures that are carried out today, but will last for several years, in which the energy production system, hopefully, will change. Full article
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Open AccessArticle
Active Charge Equalizer of Li-Ion Battery Cells Using Double Energy Carriers
Energies 2019, 12(12), 2290; https://doi.org/10.3390/en12122290 - 15 Jun 2019
Cited by 2
Abstract
In this work, a new active balancing circuit is proposed. This circuit consists of a cell-access network and an energy-transfer network. The cell-access network requires 2n + 6 switches, where n is the number of cells, and creates an energy-transfer path between [...] Read more.
In this work, a new active balancing circuit is proposed. This circuit consists of a cell-access network and an energy-transfer network. The cell-access network requires 2n + 6 switches, where n is the number of cells, and creates an energy-transfer path between unbalanced cells and the energy-transfer network. The energy-transfer network has double energy carriers and simultaneously implements cell-to-pack and pack-to-cell balancing operations without overlapping. As a result, a high power rate and fast balancing operation can be achieved by using two energy carriers in a single balancing circuit. The prototype of a proposed balancing circuit was built for six cells and then tested under various conditions; all cells in the state of charge (SOC) region of 70% to 80% were equalized after 93 min, and one charging/discharging period in the SOC region of 10% to 90% was increased by 8.58% compared to the non-balancing operation. These results show that the proposed circuit is a good way to balance charges among batteries in a battery pack. Full article
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