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Open Access

ISSN 2690-1692

© 2023 by the authors; CC BY 4.0 licence

Journal of Energy and Power Technology , Volume 5 , Issue 3 (2023)

Pages: 171

Published: October 2023

(This book is a printed edition that was published in Journal of Energy and Power Technology)

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Cover Story: Multiprobe tools in oil and gas exploration predict real-time permeability, compressibility and pore pressure during and after drilling. The original 1990s breakthrough, developed by one of the authors, has been extended to cover overbalanced and underbalanced borehole pressure conditions. The model also provides useful error bounds important to modern field applications.View this paper.

Volume 5,Issue 3

Open Access Original Research

Generalized Normal Distribution Optimization Algorithm for Economic Dispatch with Renewable Resources Integration

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

Abstract

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 [...]

Open Access Original Research

A Comparative Study of R134a and Propane (R290) as Refrigerants in Heat Pump Water Heaters

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

Abstract

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 o [...]

Open Access Original Research

Overall Reaction Rate Study of Thermal Methane Cracking in Non-Isothermal Conditions

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

Abstract

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 ind [...]

Open Access Original Research

Exploring the Potential of Phase Change Material for Thermal Energy Storage in Building Envelopes

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

Abstract

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 embed [...]

Open Access Original Research

Volt-Var Control for Utility-Scale Solar PV Plants to Downsize SVCs and Curtailment Effects

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

Abstract

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 [...]

Open Access Original Research

Study and Characterization of a Spherical Solar Collector. Part II: Comparative Analysis with Flat-Plate Devices

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

Abstract

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 [...]

Open Access Review

Improving the Performance of Solar Thermal Energy Storage Systems

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

Abstract

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 alternativ [...]

Open Access Research Article

Permeability, Compressibility and Pressure Prediction in Supercharged Wireline and FTWD Environments

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

Abstract

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 [...]

Open Access Research Article

Study and Characterization of a Spherical Solar Collector. I. Efficiency and Thermal Losses Coefficient

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

Abstract

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 c [...]
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