by Alioune Diouf  , Yasuhiro Noro  and Fujita Goro

Received: 17 June 2025;  Published: 24 October 2025;  doi: 10.21926/jept.2504015

Recently, renewable energy projects using storage systems have gained significant attention. This innovative technology requires a comprehensive investigation to overcome the technical and economic issues, which are related to optimal storage system capacity and operational requirements. In this study, an extensive battery energy storage system (BESS) sizing method was proposed considering four variables: charging and discharging scheduling, state of charge, BESS rate energy and power capacity, and degradation effe [...]

by Arnold Hendharto Widdhiarta  , Yousuke Shimaura  , Ichiro Nagai  , Takayuki Shibata  and Yutaka Moritomo

Received: 15 February 2022;  Published: 30 March 2022;  doi: 10.21926/jept.2201011

We fabricated three thermo-rechargeable batteries using low-cost transition metal hexacyanoferrate and determined the thermal voltage (Vcell) and discharge capacity (Qcell) per unit weight of the total active material in the cathode and anode. The obtained values were compared with the calculated values, which were determined by analyzing the temperature and capacity coefficients of the redox potential.

by Mikhail Pylnev  , Hussain Al-Alawadhi  and Nouar Tabet

Received: 21 September 2022;  Published: 25 November 2022;  doi: 10.21926/jept.2204038

The most commonly used process for fabricating perovskite solar cells is based on wet chemistry, which greatly limits the choice of materials suitable for optimizing the performance of the device. We developed a new approach for the fabrication of perovskite-based solar cells. In the smart stacking process, the perovskite solar cell was assembled by stacking two pieces of perovskite films prepared separately. A working perovskite solar cell was developed with PCE = 0.78% and the perovskite layer was analyzed with X [...]

by Meenal Jain  , Meenakshi Mital  and Matt Syal

Received: 21 November 2021;  Published: 14 April 2022;  doi: 10.21926/jept.2202014

India is a rapidly developing nation and is heavily dependent on fossil fuels. Renewable energy presents an attractive solution to the growing challenges concerning energy needs. Solar energy is abundant in India, and thus, its application and use are rapidly advancing. This study assesses various government initiatives for off-grid Solar Photovoltaic/Solar Water Heating systems for commercial establishments in India and elucidates the need for improvements in their implementation, highlighting the problems in avai [...]

by Lara T. C. Mota  , Igor M. Figueredo  , F. Murilo T. Luna  , Rodrigo S. Vieira  , Célio L. Cavalcante Jr.  and M. Alexsandra S. Rios

Received: 26 September 2022;  Published: 22 December 2022;  doi: 10.21926/jept.2204042

In this study, the oxidative stability of the cottonseed oil biodiesel (CB) and soybean oil biodiesel (SB) was investigated by two methodologies, Rancimat and Differential Scanning Calorimetry (DSC), using samples fresh and aged (mid-term storage condition (100 days)). The biodiesel samples were synthesized by transesterification and characterized by specific mass, kinematic viscosity, acidity value, ester content, viscosity index, and peroxide value. The activation energy (Ea), Arrhenius pre-exponential factor (Z) [...]

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 George Z. Voyiadjis  and Peter I. Kattan

Received: 27 October 2020;  Published: 10 May 2021;  doi: 10.21926/jept.2102021

A robust mathematical method for the characterization of damage in carbon nanotubes is presented the presentation here is limited to elasticity. In this regard, the second and third order elastic stiffnesses are employed. All this is based on damage mechanics. The hypotheses of elastic strain equivalence and elastic energy equivalence are utilized. A new damage variable is proposed that is defined in terms of the surface area. This is in contrast to the classical damage variable which is defined in terms of the cro [...]

by Owen Sedej  , Eric Mbonimpa  , Trevor Sleight  and Jeremy Slagley

Received: 18 February 2022;  Published: 18 August 2022;  doi: 10.21926/jept.2203027

Waste-to-Energy technologies have the potential to dramatically improve both the natural and human environment. One type of waste-to-energy technology that has been successful is gasification. There are numerous types of gasification processes and in order to drive understanding and the optimization of these systems, traditional approaches like computational fluid dynamics software have been utilized to model these systems. The modern advent of machine learning models has allowed for accurate and computationally ef [...]

by Abdel Zaro  , Spencer Jones  and Ethan Languri

Received: 31 August 2023;  Published: 16 November 2023;  doi: 10.21926/jept.2304035

In this paper, an efficient industrial wastewater and leachate evaporation method is proposed and tested experimentally. The goal of this study is to investigate whether the addition of a carbon foam (CF) porous layer can lead to energy savings by evaporating more water mass per unit of energy input. The standard boiling evaporator layout was redesigned by placing the heating element in the upper region of the tank and CF underneath the heat source. The CF purposed to localize the energy in an area by the water' [...]

by Jamie A. Chin  and Wilson C. Chin

Received: 12 February 2022;  Published: 23 May 2022;  doi: 10.21926/jept.2202018

Flows in multi-branch piping systems are modeled for linear Newtonian and nonlinear Power Law, Bingham Plastic and Herschel-Bulkley fluids. The nonlinear models are often used to describe multiphase fluids consisting of liquid and solid phases, including cement slurries and drilling muds in petroleum engineering. Rheological and heterogeneous multiphase effects are important to blood flows in single and bifurcated arteries, capillaries and veins – biological applications are also emphasized to highlight their incre [...]

by Lotta Lounasmeri

Received: 26 November 2021;  Published: 06 April 2022;  doi: 10.21926/jept.2202012

This paper examines the building of a new nuclear plant as a greenfield operation in Pyhäjoki, Finland. A newly-founded energy company, Fennovoima, was granted a license by the Finnish parliament to build a new power plant in 2010. In the years following this Decision in Principle the project faced several obstacles. Through interviews with key actors, this paper identifies the interests and core beliefs associated with building the plant. It posits that, in Finland, the underlying ideas and values surrounding nucl [...]

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 Cherechi Ndukwe  , M. Tariq Iqbal  , Jahangir Khan  and Mohsin Jamil

Received: 18 April 2022;  Published: 26 June 2022;  doi: 10.21926/jept.2202022

One important aspect toward proper and stable functioning of a communication-based controlled microgrid is data transmission. Consequently, an analysis of the effect of data transmission delay is of significance for any chosen communication protocol. This paper focuses on the effect of employing LoRa for data transfer at the secondary control level of a standalone DC microgrid. It analyses the effect of LoRa transmission delay on the dynamic performance of DC microgrids. This paper simulates a community DC microgri [...]

by Vincent Anayochukwu Ani

Received: 06 August 2023;  Published: 24 January 2024;  doi: 10.21926/jept.2401002

Energy is a prerequisite to running health facilities and is, therefore, key to the success of the service. Karshi primary healthcare centre (PHC) facility is confronted with an unreliable power supply that leads to a high cost of generating power from diesel to operate its equipment. This facility needs a sustainable and reliable electricity supply and therefore a change in their energy system to enable it improve its quality of healthcare delivery services. A solar energy-based electricity generation system that [...]

by Carsten Croonenbroeck  and David Hennecke

Received: 06 February 2024;  Published: 15 March 2024;  doi: 10.21926/jept.2401008

We address the Wind Farm Layout Optimization (WFLO) problem and tackle the optimal placement of several turbines within a specific (wind farm) area by incorporating additional aspects of an economically driven target function. With this, we contribute three refinements for WFLO research: First, while many research contributions optimize the turbines' locations subject to maximum energy production or energy efficiency, we instead pursue a strategy of maximizing a profit objective. This enables us to incorporate inne [...]

by Koorosh Goudarzi  and Mohammad Reza Zare

Received: 19 April 2022;  Published: 08 June 2022;  doi: 10.21926/jept.2202020

Passenger and commercial internal combustion engines have relatively large dissipated thermal energy sources that can be used for initiating thermodynamic refrigeration cycles at low temperatures while improving engine efficiency. Researchers have focused on combined power-refrigeration cycles in past studies. This paper presents the operation and performance of a new combined refrigeration system driven by waste heat recovery within the internal combustion engines. For this purpose, the effects of several paramete [...]

by Minggao Zhou  , Yongren Feng  , Yongzeng Xue  , Yanmin Zhou  , Yongchao Chen  and Wilson C. Chin

Received: 12 April 2023;  Published: 27 November 2023;  doi: 10.21926/jept.2304038

An early formation tester operating a “sink probe” that extracts fluids from the borehole, also measures pressures at its location; pressures are additionally collected at two passive sensors, one situated 180 deg away and the second about meter axially. These positions are not conducive to accurate permeability predictions, since pressure transient signals used for inverse analysis attenuate very rapidly. Closer probe spacings offer formation evaluation advantages at low mobilities because Darcy pressure dissipati [...]

by Journal of Energy and Power Technology Editorial Office

Received: 05 January 2022;  Published: 06 January 2022;  doi: 10.21926/jept.2201001

The editors of Journal of Energy and Power Technology would like to express their sincere gratitude to the following reviewers for assessing manuscripts in 2021. We greatly appreciate the contribution of expert reviewers, which is crucial to the journal's editorial process. We aim to recognize reviewer contributions through several mechanisms, of which the annual publication of reviewer names is one. Reviewers receive a voucher entitling them to a discount on their next LIDSEN publication and can download a cer [...]

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 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 Hamidreza Shamsi  , Ehsan Haghi  , Manh-Kien Tran  , Sean Walker  , Kaamran Raahemifar  and Michael Fowler

Received: 11 March 2022;  Published: 25 December 2022;  doi: 10.21926/jept.2204043

Road traffic is a significant source of air pollution that has a harmful impact on human health. To reduce the health and environmental impacts of fossil fuel consumption in the transportation sector, many countries have implemented policies to promote the deployment of electric vehicles (EVs). A vital factor to consider when designing policies to support EV use is the monetized health impacts of fossil fuel consumption. This research aims to investigate the health benefit of replacing internal combustion engine ve [...]

by Rafael B. Oliva  , Andrés Zappa  , Mariano Amadio  and Guillermo Catuogno

Received: 31 October 2024;  Published: 05 May 2025;  doi: 10.21926/jept.2502009

This work addresses the main results of a test site for small wind turbines (SWTs) located in Patagonia, and the development of the measurement systems involved, including the uncertainties calculations according to applicable IEC standards. Due to market evolution for over a decade, the test systems evolved from battery-charging SWTs to grid-connected units. The test site, developed and managed by state-owned INTI (National Institute for Industrial Technology), was established in 2012 and received support from the [...]

by Nanimpo Kansongue  , Stephen Vertigans  and James Njuguna

Received: 22 December 2024;  Published: 13 October 2025;  doi: 10.21926/jept.2504014

This work investigates the potential of renewable energy to significantly reduce Togo’s energy deficit, offering a critical analysis of the country’s current energy landscape. It evaluates the availability and viability of renewable energy sources—particularly solar and small-scale hydropower—and examines the mismatch between energy supply and growing demand. The study highlights Togo’s heavy reliance on biomass and energy imports from neighbouring countries such as Ghana, Côte d’Ivoire, and Nigeria, which exacerba [...]

by Zeel Maheshwari  and Rama Ramakumar

Received: 29 August 2021;  Published: 21 January 2022;  doi: 10.21926/jept.2201006

Rural and remote communities are more vulnerable to damage caused by extreme events as compared to urban areas. Natural disasters can disrupt basic supplies such as domestic water supply and cooking needs in addition to electricity outages. The recognition of the interlinked nature of food, water and energy has gained momentum over the past few years. Smart Integrated Renewable Energy System (SIRES) has been proposed to handle basic needs such as cooking, domestic and irrigation water supply, and electricity to rem [...]

by Daming Zhang

Received: 21 January 2022;  Published: 07 March 2022;  doi: 10.21926/jept.2201008

In this paper, a method for operating AC microgrids in both off-grid or standalone and grid-connected modes is proposed to minimize the use of energy storage by increasing the number of PV panels and curtailing their output power. When the intensity of daylight decreases, power is imported from the main grid through an AC/DC/AC converter or solid-state transformers in parallel to compensate for the shortage. By using a three-phase transformer in Δ-Y connection with Y’s neutral connected to its local grounding syste [...]