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 [...]