by Agnes C. Nkele  , Imosobomeh L. Ikhioya  , Chinedu P. Chime  and Fabian I. Ezema

Received: 29 May 2023;  Published: 18 July 2023;  doi: 10.21926/jept.2303024

In recent times, renewable energy resources have been greatly researched because of the increasing concern to minimize global warming and meet energy demands. Energy storage systems have become useful tools for sustainability and meeting energy needs. Solar energy has proven in recent times to be the primary and most prevalent option due to its environmental friendliness, availability, and minimal pollution. Effective utilization of available energy resources has led to developing new alternative energy devices lik [...]

by Mahdi Yousefi  , Scott Donne  , Shabnam Bahremand Abrasi  and Mohammad Yousefi

Received: 10 April 2023;  Published: 13 September 2023;  doi: 10.21926/jept.2303028

The thermal cracking of methane (TMC) is a significant reaction occurring above 850°C, which proceeds in two stages: non-isothermally and isothermally. However, most existing studies have focused on obtaining reaction rates under isothermal conditions [1], limiting their applicability to practical industrial reactor conditions. This novel research aims to determine the overall thermal decomposition rate of methane to hydrogen and carbon in adiabatic conditions, covering the range of unstable industrial reactor temp [...]

by Clara L.e Silva  , Bárbara H.S. Miranda  , Maria L. Vilela  , Jair F. Rodrigues  , Thainá G. Cunha  , Jhonatan A. Dias  , Gabriela A. Soares  , Vinicius Freitas  , Rodrigo de Q. Vilaça  , Luana Wouk  and Diego Bagnis

Received: 07 March 2022;  Published: 04 July 2022;  doi: 10.21926/jept.2203023

The lifetime and stability of organic photovoltaics (OPVs) are the key factors that influence the technology used to scale up and commercialize OPVs. High-performing and reliable devices are used to fabricate the devices of choice. Materials and methods that can be used to prevent the degradation of organic materials, enabling better OPV applications, are being increasingly researched in recent years. Herein, we present the surface modification process of a commercial, flexible barrier film based on polyethylene te [...]

by Minghan Bao  , Nagi Abdussamie  and Faisal AlThobiani

Received: 03 December 2022;  Published: 09 February 2023;  doi: 10.21926/jept.2301008

Analysing the structural response of offshore wind turbines (OWTs) requires a robust method to estimate environmental loadings associated with extreme weather conditions. This study aimed to accurately predict wind loadings on a non-rotating OWT using a Computational Fluid Dynamics (CFD) code, Ansys Fluent package. The inlet velocity boundary condition was defined as a uniform inlet wind speed and then as a Normal Wind Profile (NWP). Three large wind speeds of 25 m/s, 40 m/s and 50 m/s were tested with the aid of t [...]

by Alla V. BALUEVA  , Ilia N. Dashevskiy  and Christian Sims

Received: 18 April 2022;  Published: 30 August 2022;  doi: 10.21926/jept.2203028

Due to the increasing need to further develop the world gas and oil industry and the increased public attention to clean energy sources, studying and preventing Hydrogen Induced Cracking is one of the main safety concerns in nuclear power plants, oil pipelines and platforms. In this article, the growth and incubation times for internal Hydrogen Induced Cracks (HIC) are examined. Specifically, these times are modeled in two separate phases - the first phase (I) is a long time approximation, when the crack growth is [...]

by C. Shah Kabir

Received: 28 March 2023;  Published: 12 June 2023;  doi: 10.21926/jept.2302019

Investigations on two-phase gas/liquid flow in pipes have been under study for nearly six decades. These studies have significantly assisted in managing fluid flow in the wellbore and surface networks, leading to the separation of phases and transmission of oil and gas into the market. This study summarizes some of the main lessons learned in flow through wellbores. Besides understanding some of the fundamental principles, we focused on the practical items of interest: Conventional production scenarios for oil and [...]

by Nicholas J Cook

Received: 14 April 2021;  Published: 25 June 2021;  doi: 10.21926/jept.2102027

A refined and extended version of the Offset Elliptical Normal mixture model has been developed to parameterise the seasonal diurnal wind vector automatically. Automated using R scripts, the method eliminates any potential risk of confirmation bias posed by the manual supervision in the original method. Refinements to the method include the latest algorithms for clustering of Gaussian mixtures, with Bayesian regularisation to set the number of components and to limit the predisposition to overfit. A new extension u [...]

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 Zhen Liu  , Li Yang  , Abhishek Lahiri  , James F Rohan  and Frank Endres

Received: 26 December 2021;  Published: 27 March 2022;  doi: 10.21926/jept.2201010

Herein, we report the coating of nanostructured germanium using a polypyrrole (PPy) polymer coat as a composite anode material for the fabrication of lithium-ion batteries. The Ge/PPy composites were synthesized following the direct electrochemical deposition method in an ionic liquid (IL). The results revealed that the coating of PPy on Ge helped realize stable battery cycling and reversible capacities, which were not observed in uncoated Ge. The PPy layers could effectively inhibit side reactions between the elec [...]

by Syuma Ichida  , Daisuke Mori  , Sou Taminato  , Tao Zhang  , Yasuo Takeda  , Osamu Yamamoto  and Nobuyuki Imanishi

Received: 17 February 2022;  Published: 15 March 2022;  doi: 10.21926/jept.2201009

Acidic aqueous lithium-air batteries are attractive candidates for use as energy sources in electric vehicles because of their high energy and power densities and ability to operate under ambient conditions. An aqueous lithium-air battery with an acetic acid catholyte has a high theoretical energy density of 1,478 Wh kg-1, and the reaction product is soluble in the catholyte. In this study, we have studied the cell performance of a Li/interlayer electrolyte/NASICON-type solid lithium-ion conductor/acetic acid catho [...]