by Antonio Vázquez-López  , Marina García-Carrión  , Erlend Hall  , Anisa Yaseen  , Ilknur Kalafat  , María Taeño  , Junjie Zhu  , Xinyu Zhang  , Elif Arici  , Omer Suat Taskin  , David Maestre  , Emilio Nogales  , Pedro Hidalgo  , Julio Ramírez-Castellanos  , Bianchi Méndez  , Neslihan Yuca  , Smagul Karazhanov  , Erik S. Marstein  and Ana Cremades

Received: 09 November 2020;  Published: 08 May 2021;  doi: 10.21926/jept.2102020

Hybrid composites based on inorganic nanomaterials embedded into a polymer matrix have were synthesized and characterized. Oxide semiconductor nanoparticles (SnO, SnO2, TiO2, Ga2O3, and NiO) and Si nanoparticles were employed as inorganic counterparts in the hybrid composite, while a conductive polymer (PEDOT:PSS) with diverse additives was used as the organic matrix. The composites were spin-coated on Si or glass substrates. The potential use of these materials in photovoltaic devices to improve Si surface passiva [...]

by Nobuyuki Imanishi  , Tao Zhang  , Daishuke Mori  , Sou Taminato  , Yashuo Takeda  and osamu yamamoto

Received: 21 February 2021;  Published: 08 May 2021;  doi: 10.21926/jept.2102019

Because lithium metal exhibits high specific capacity and low potential, it is the best candidate for fabricating anodes for batteries. Rechargeable batteries fabricated using lithium anode exhibit high capacity and high potential cathode; these can be potentially used to fabricate high energy density batteries (>500 Wh kg-1) that can be used for the development of next-generation electric vehicles. However, the formation and growth of lithium dendrites and the low coulombic efficiency recorded during lithiu [...]

by Yi-Chun Hsu  , Min-Ze Lu  and Chang-Ming Liaw

Received: 18 December 2020;  Published: 28 April 2021;  doi: 10.21926/jept.2102018

This paper proposes a Wind Turbine Emulator (WTE) using an Indirect Field Oriented (IFO) Induction Motor (IM). The IM drive can be controlled as a conventional prime mover in speed mode, or a wind turbine in torque-speed mode via robust observed torque control. This paper presents key issues for establishing a high-performance IFO IM drive. Further, this study develops a wind turbine load Interior Permanent-Magnet Synchronous Generator (IPMSG) followed by a three-phase Vienna Switch-Mode Rectifier (SMR). It receive [...]

by Oleksandr Skrylnyk  , Emilie Courbon  , Nicolas Heymans  and Marc Frère

Received: 18 December 2020;  Published: 14 April 2021;  doi: 10.21926/jept.2102017

Hybrid solar thermal systems are considered to be a promising solution for delivering clean thermal energy for the building sector, especially while combining them with other renewable energy sources. Usually, solar energy production does not match the thermal energy demand, and hence the energy storage must be integrated. Thermochemical energy storage is adapted particularly to be used along with solar thermal applications. In this article, the design of the combined solar thermochemical energy storage system is p [...]

by Chen-Wei Yang  , Min-Ze Lu  , Wei-Ming Ma  and Chang-Ming Liaw

Received: 23 December 2020;  Published: 07 April 2021;  doi: 10.21926/jept.2102016

This paper presents a three-phase full-bridge boost switch-mode rectifier (SMR) fed switched-reluctance motor (SRM) drive with energy storage buffer. First, the power circuits and control schemes of the two power stages are properly designed. Except for having good line drawn power quality, the boostable DC-link voltage of the SRM drive can enhance the SRM driving performance in wide speed range. And the recovered regenerative braking energy can be sent back to the grid successfully. Then, a battery storage system [...]

by Anna Castaldo  , Emilia Gambale  and Giuseppe Vitiello

Received: 19 January 2021;  Published: 02 April 2021;  doi: 10.21926/jept.2102015

This study deals with the production of zinc silicate thin films employing a solid-state reaction at temperatures ranging from 300 °C to 560 °C, to develop new inorganic, n-type materials with seemingly incompatible properties as low work function, high mobility, and high visible transmittance. Depending on a careful reaction control, zinc silicates can preserve reagents (silicon and/or ZnO) as nanoaggregate guests, exhibiting tunable light absorption and emission properties that make them useful for differ [...]

by Shih-Ang Hsu

Received: 21 December 2020;  Published: 24 March 2021;  doi: 10.21926/jept.2101014

In order to improve offshore wind power operation and maintenance (O&M), particularly during tropical and non-tropical cyclones, short-term forecasts or nowcasts up to 6 hours of meteorological and oceanographic (met-ocean) parameters including wind, waves, currents and turbulence intensity are needed. On the basis of numerous air-sea and wind-wave interaction experiments, datasets are analyzed including those from simultaneous measurements of wind and waves during Hurricane Wilma. Formulas are presented for nowcas [...]

by Peter Leary  and Peter Malin

Received: 30 November 2020;  Published: 19 March 2021;  doi: 10.21926/jept.2101013

In interest of accurately modelling wellbore production in convective geothermal systems, we draw attention to two approaches to numerical simulation of crustal fluid flow. The historical "strong" approach simulates the fluid mass conservation condition on a localised finite difference mesh approximation to poroelastic continua. The more flexible "weak" approach globally enforces fluid mass conservation by in effect integrating over all numerical mesh cells. Strong formulation crustal flow simulation emerged from n [...]

by Aurore Raoux  , Ilan Robin  , Jean-Philippe Pezy  , Anne-Claire Bennis  and Jean-Claude Dauvin

Received: 08 October 2020;  Published: 17 March 2021;  doi: 10.21926/jept.2101012

The French coast of the Atlantic and English Channel (EC) is promising for the development of Marine Renewable Energy (MRE), including wind, wave, and tidal stream, due to the high velocity of currents in some parts of the area. This paper, focusing on wind and tidal energy, discusses how the implementation of MRE converters influences biodiversity, and vice versa, through biofouling and reef effects. The understanding of these interactions requires the knowledge of the hydro-sedimentary conditions and the macrofau [...]

by Aly Mousaad Aly  and Milad Rezae

Received: 26 December 2020;  Published: 04 March 2021;  doi: 10.21926/jept.2101011

During their lifecycle, wind turbines can be subjected to multiple hazard loads, such as high-intensity wind, earthquake, wave, and mechanical unbalance. Excessive vibrations, due to these loads, can have detrimental effects on energy production, structural lifecycle, and the initial cost of wind turbines. Vibration control by various means, such as passive, active, and semi-active control systems provide crucial solutions to these issues. We developed a novel control theory that enables semi-active controller tuni [...]