by Kesiena Owebor  , Smith Orode Otuagoma  , Ogheneakpobo Jonathan Eyenubo  , Arthur Gogo Uranta  , Friday Erhimudia Ukrakpor  , Kesiena Ezewu  and Ebimene Ezekiel Ebisine

Received: 01 August 2023;  Published: 08 November 2023;  doi: 10.21926/jept.2304033

The proper management of sawdust is critical to socioeconomic development. In this research, waste-to-energy has been proposed to utilize sawdust in selected timber markets in Port Harcourt, namely, Illoabuchi Timber Market, Marine Base Timber Market, and Mile 3 Timber Market. A quantitative approach has been taken to estimate the sawdust generation, energy potential, power generation capacities, and pollutant reduction of indiscriminate combustion of sawdust. The findings suggest that, annually, 171 ktons, 42 kton [...]

by Fariba Moradipour  , Andreas Markert  , Thomas Rudszuck  , Niklas Röttgen  , Gerald Dück  , Martin Finsterbusch  , Felix Gerbig  , Hermann Nirschl  and Gisela Guthausen

Received: 04 August 2023;  Published: 02 November 2023;  doi: 10.21926/jept.2304032

Charge transfer and mobility are essential for electrochemical processes in batteries, which need to be understood in detail for optimization, especially in the case of all-solid-state batteries. Wide line NMR is well-known in solid-state NMR and allows the quantification of ion mobility in ordered crystalline and amorphous structures. Temperature-dependent 23Na-NMR is sensitive to ion mobility via longitudinal relaxation, but also via line analysis and transverse relaxation. As 23Na is a spin 3/2 nucleus, 23Na-NMR [...]

by Kamal A.R. Ismail  , Fatima A.M Lino  , Jorge R. Henriquez  , Mohamed Teggar  , Abdelghani Laouer  , Muslum Arici  , Amani Benhorma  and Daniel Rodríguez

Received: 12 June 2023;  Published: 19 October 2023;  doi: 10.21926/jept.2304031

The building sector is rated as a big consumer of electric energy and emissions, responsible for about 40% of final electric energy consumption. As a result, the Paris Agreement 2015 set a goal for buildings and the construction sector to reach a nearly zero-carbon stage by 2050. This urged most countries to create regulations for the construction sector and invest in energy efficiency programs. The present paper aims to present an updated review of building energy-saving solutions and techniques to contribute to c [...]

by Sadmanul Hoque  , Md. Rashidul Islam  , Md Shafiullah  , Saymun Adnan  and Md. Samiul Azam

Received: 18 June 2023;  Published: 28 September 2023;  doi: 10.21926/jept.2303030

In an electric power system operation, the main goal of economic dispatch (ED) is to schedule the power outputs of committed generating units efficiently. This involves consideration of relevant system equality and inequality constraints to meet the required power demand at the lowest possible operational cost. This is a challenging optimization problem for power system operators that can be dealt with efficient meta-heuristic algorithms. This article uses a recent meta-heuristic approach named the generalized norm [...]

by Ann Lee  and Shaokoon Cheng

Received: 26 March 2023;  Published: 18 September 2023;  doi: 10.21926/jept.2303029

In the context of decarbonization efforts, heat pump water heaters (HPWHs) offer an attractive solution over conventional electric resistance type hot water systems due to their 2-3 times higher efficiency. However, the high manufacturing costs and taxes associated with using hydrofluorocarbon (HFC) refrigerant make HPWHs expensive. As a means to tackle this issue, this paper explores the use of propane (R290) as a refrigerant in HPWHs. The study involves an experimental comparison of R290 and R134a, with refrigera [...]

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 Zachary Brozzesi  , Darson Dezheng Li  and Ann Lee

Received: 16 June 2023;  Published: 08 September 2023;  doi: 10.21926/jept.2303027

Buildings, with their significant energy consumption, pose a pressing concern for the future. Inadequate heating, ventilation, and air-conditioning (HVAC) systems further exacerbate thermal management difficulties and energy requirements. To address these challenges, Phase Change Materials (PCMs) offer valuable potential for sustainable energy reduction within the building sector, leveraging passive cooling and heating techniques. Numerical study has been conducted to explore the impact of embedding PCM within the [...]

by Ken Shimomukai  , Haruka Maeda  , Zahirah binti Muhammad Azman  , Sandro Sitompul  and Goro Fujita

Received: 09 March 2023;  Published: 03 August 2023;  doi: 10.21926/jept.2303026

One way to increase solar photovoltaic penetration in the grid is the management of voltage fluctuations. This is because a photovoltaic plant cannot be interconnected to the grid if it causes voltage violations. Voltage violation is where voltage exceeds the acceptable range. Often, grid operators request photovoltaic plant owners to regulate voltage sufficiently with expensive and space-consuming static Var compensators. Unfortunately, this sometimes makes the project less feasible. This paper argues that there a [...]

by Carlos Armenta-Déu

Received: 18 May 2023;  Published: 27 July 2023;  doi: 10.21926/jept.2303025

The paper analyses the performance of a spherical solar collector compared to the efficiency of a flat-plate solar collector, which is the type of solar collector that does not use a tracking system in collecting solar radiation for energy conversion. Spherical solar collector benefits from a constant value of the angle of incidence, which optimizes the solar radiation that strikes the absorber of the solar device and maximizes the energy collection. Besides, the spherical geometry has a larger area for equal dimen [...]

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 Xiaofei Qin  , Yongren Feng  , Lejun Wu  , Zhongjian Tan  , Yanmin Zhou  and Wilson Chin

Received: 12 April 2023;  Published: 10 July 2023;  doi: 10.21926/jept.2303023

In conventional wireline and LWD/MWD formation testing, downhole predictions for rock and fluid properties are based on simplified Darcy flow models, but only for mathematical expediency. These require initially constant pressures that are uniform throughout the reservoir. This limitation precludes common applications in overbalanced drilling, so that supercharge or near-well invasion effects - associated with rapidly decreasing pressures at the sandface where pressures are measured - are completely ignored. Such 1 [...]

by Carlos Armenta-Déu

Received: 21 April 2023;  Published: 04 July 2023;  doi: 10.21926/jept.2303022

This paper studies and characterizes a solar collector with spherical geometry to produce hot water for sanitary and domestic applications and other facilities. The new geometry enlarges the solar collector surface and allows full sun tracking during the day without needing a solar tracking system. Although this geometry has been in use for some time, its market penetration is low due to the lack of perfect knowledge of solar collector behavior and the benefits compared with conventional solar collectors. The studi [...]

by Journal of Energy and Power Technology Office

Received: 25 June 2023;  Published: 28 June 2023;  doi: 10.21926/jept.2302021

by Alpha Chukwumela Ajie  , Mohammed Moore Ojapah  and Endurance Ogheneruona Diemuodeke

Received: 07 February 2023;  Published: 20 June 2023;  doi: 10.21926/jept.2302020

With their higher sustainability index, biofuels, environmentally-friendly and renewable nature is a viable alternative energy source in the transportation sector. This study presents the effect of waste cooking oil (WCO) biodiesel on performance, combustion, and emission from a compression ignition engine. The biodiesel was blended with diesel in varying proportions of 5% biodiesel and 95% diesel (designated as B5), 10% biodiesel in diesel (B10), 15% biodiesel in diesel (B15), 20% biodiesel in diesel (B20), 50% bi [...]

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 Gerasimos Rigatos  , Masoud Abbaszadeh  , Bilal Sari  and Pierluigi Siano

Received: 07 December 2022;  Published: 11 May 2023;  doi: 10.21926/jept.2302018

The article aims at optimizing six-phase induction generator-based renewable energy systems (6-phase IGs or dual star induction generators) through a novel nonlinear optimal control method. Six-phase induction generators appear to be advantageous compared to three-phase synchronous or asynchronous power generators, in terms of fault tolerance and improved power generation rates. The dynamic model of the six-phase induction generator is first written in a nonlinear and multivariable state-space form. It is proven th [...]

by Mahmoud F. Elmorshedy  , Abualkasim Bakeer  and Dhafer Almakhles

Received: 14 February 2023;  Published: 09 May 2023;  doi: 10.21926/jept.2302017

The special design of linear induction machines (LIMs) leads to adverse effects caused by the longitudinal and end effects. These effects make the thrust control of the LIMs most attractive because its value decreases sharply with the speed increase. Thus, finite-state model predictive control (FS-MPC) is developed to increase the performance of the LIMs. However, the variable switching frequency is the main drawback of this control. Consequently, the main objectives of this paper are to propose FS-MPC with a const [...]

by Regiani Aparecida de Almeida  , Ricardo Vicente de Paula Rezende  , Flavia Aparecida Reitz Cardoso  and Lucio Cardozo Filho

Received: 17 December 2022;  Published: 18 April 2023;  doi: 10.21926/jept.2302016

In this work with CFD simulations, the evaluation of the supercritical anti-solvent (SAS) process for producing nanoparticles from an expanded solution of ethanol/solute in carbon dioxide is reported. The influence of the solution and antisolvent flow rates on mean particle size, the flow dynamic, and the supercritical mixture's jet velocity must be well established in the literature and analyzed. The high flow rate of the anti-solvent resulted in increased mean particle sizes for all studied cases. At the lowe [...]

by Aniebiet D. Udoh  , Ogheneruona E. Diemuodeke  , Mohammed M. Ojapah  , Fidelis I. Abam  and Joseph C. Ofodu

Received: 29 December 2022;  Published: 13 April 2023;  doi: 10.21926/jept.2302015

The quest to decarbonize the energy space to avert the negative climate change consequences calls for using low/zero-carbon energy conversion technologies in the energy generation space. The Organic Rankine Cycle is a low/zero-carbon energy conversion technology for recovering waste heat from low to medium-temperature heat sources and for biomass conversion. Therefore, this paper presents the thermodynamic optimization, with an artificial bee colony algorithm, of different ORC configurations, including simple organ [...]

by Jeff Callaghan

Received: 19 October 2022;  Published: 07 April 2023;  doi: 10.21926/jept.2302014

During February 2022 major riverine flooding occurred in an area which has the fastest population growth in Australia. This extended from the Mary River in Southeast Queensland (SEQ) to the Clarence River in Northeast NSW (NENSW). Two centres within this area were devastated by floods unprecedented in living memory. One was the Brisbane Metropolitan area where all-time record daily rainfall in the suburbs flooded creeks. This creek flooding was much worse than that caused by the Brisbane River itself where Wivenhoe [...]

by Ibikunle Olalekan OGUNDARI

Received: 08 September 2022;  Published: 03 April 2023;  doi: 10.21926/jept.2302013

This study examined the techno-economic specifications for a Waste-to-Suburban Cooking Energy critical infrastructure project in Southwestern Nigeria. Technological and project economic data for the W2E project were obtained from strategic sources and energy project foresight/analysis framework used. The results showed residential upgraded biogas-for-cooking demand of approximately 10,243 m3/month, and municipal solid waste (MSW) input of approximately 80 tonnes/month. The planned biogas plant had estimated costs o [...]

by Gerald Jandl  , Rainer Horn  , Richard Schroeder  , Kai-Uwe Eckhardt  and Peter Leinweber

Received: 23 November 2022;  Published: 22 March 2023;  doi: 10.21926/jept.2301012

The increasing number of biogas plants with various digested organic materials and output of digestates calls for more detailed investigations of their suitability as soil amendments. In a trial in Northern Germany two replicate plots each were treated with fresh or prolonged fermented digestate to investigate the influence of digestates on the composition of soil organic matter (SOM). The relative proportions of relevant SOM compound classes were determined by pyrolysis-field ionization mass spectrometry (Py-FIMS) [...]

by Silvio Simani  , Saverio Farsoni  and Paolo Castaldi

Received: 02 February 2023;  Published: 21 March 2023;  doi: 10.21926/jept.2301011

In agreement with the Editor-in-Chief, the editorial office, and the authors, this article has been removed and marked as retracted because its content and data contained plagiarism from an unpublished study. Please refer to the Removal Statement.

by Junmo Moon  , Satita Thiangtham  , Ruijie Zheng  , Sicheng Liu  , Chayanaphat Chokradjaroen  , Yasuyuki Sawada  and Nagahiro Saito

Received: 04 December 2022;  Published: 20 February 2023;  doi: 10.21926/jept.2301010

Crystalline lithium fluoride (LiF) has been intensively pursued as potential alternative solid electrolytes (SEs) owing to its excellent chemical and electrochemical oxidation stability, and good deformability. However, due to its low ion conductivity, LiF is still challenging for practical SE applications. Herein, Li-Zr-F composite-based SE by liquid-mediated synthesis is proposed to be studied. methanol (CH3OH) was mainly evaluated as a liquid-mediated precursor for synthesizing Li-Zr-F composites under the stoic [...]

by Daming Zhang

Received: 06 December 2022;  Published: 17 February 2023;  doi: 10.21926/jept.2301009

To increase power level in an autonomous microgrid, higher voltage is necessary. In this paper, detailed Matlab/Simulink modeling of a microgrid operated at medium-voltage level and at constant frequency has been conducted. Modified boost converter and medium-frequency transformer isolated DC/DC converter are adopted for both solar energy and wind energy harnessing in order for them to be connected with the microgrid. This paper further adopted a differential evolution (DE)-based method to carry out load flow analy [...]