04 - LIDSEN Publishing Inc.丨The Open Access Publisher

Volume 5,Issue 4

Open Access Original Research

Stability Analysis of Autonomous Microgrid Operated at Constant-Frequency with the Consideration of Reactive Power Balance

Daming Zhang and

Xiuhui Tang

Received: 01 September 2023; Published: 29 November 2023; doi: 10.21926/jept.2304039

Abstract

Large-scale autonomous microgrids have potential application values as they can increase renewable energy penetration level without compromising the stability of the existing large power systems. Before their widespread implementation, critical issues like stability analysis etc need to be solved. This paper analyses the stability in an autonomous microgrid operated at constant frequency with the consideration of reactive power balance. Difference equations of reactive power for the grid-forming [...]

Open Access Original Research

Array Formation Testing with Multiple Azimuthal and Axial Pressure Transducers

Minggao Zhou ,

Yongren Feng ,

Yongzeng Xu ,

Yanmin Zhou ,

Yongchao Chen and

Wilson Chin

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

Abstract

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 Darc [...]

Open Access Research Article

Saving is Losing: Pumping Cost vs. GHG Emissions in Water Distribution Systems

Brian D. Barkdoll

Received: 26 May 2023; Published: 21 November 2023; doi: 10.21926/jept.2304037

Abstract

Global climate change has necessitated the reduction of GHG emissions. Water distribution system (WDS) pumping adds to these emissions and, therefore, should be reduced. Under electricity hourly cost tariffs, utilities are incentivized to pump during the nighttime hours. This can have a deleterious effect, however, on GHG emissions. To quantify this effect, a modeling study of twelve real WDSs was performed with an electricity tariff. The systems all had the typical tank-level-based [...]

Open Access Concept Paper

Net Zero Corridors: A Case Study Approach from Perth, Australia to Decarbonize Urban Power and Transport

Peter Newman and

Marie Verschuer

Received: 27 February 2023; Published: 17 November 2023; doi: 10.21926/jept.2304036

Abstract

The transition to net zero cities is a pivotal challenge in the face of climate change. This research introduces a novel methodology termed "Net Zero Corridors," which emphasizes a bottom-up approach to decarbonize urban power and transport systems. By focusing on urban corridors, this method integrates distributed power systems with urban transport, offering a localized solution to the broader challenge of urban decarbonization. Drawing from urban fabric theory and urban m [...]

Open Access Original Research

Efficient Industrial Wastewater and Leachate Evaporation Utilizing Heat Localization in Porous Media

Abdel Zaro ,

Spencer Jones and

Ethan Languri

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

Abstract

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 a [...]

Open Access Original Research

An Adsorption-Desorption Heat Engine for Power Generation from Waste Heat

Mikhail Granovskiy

Received: 17 October 2023; Published: 14 November 2023; doi: 10.21926/jept.2304034

Abstract

According to the United States Department of Energy, waste heat recovery would allow up to a 20% reduction in greenhouse gases (GHG) emission. Most of the waste energy is discharged as a low-grade heat at temperatures less than 250°C. Therefore, the development of new technologies and the enhancement of existing ones to convert low-grade heat into electrical or mechanical energy are of great importance. The working principle of adsorption-desorption heat pumps with cyclic switching between adsor [...]

Open Access Original Research

Technical Analysis of Sawdust-to-Power: A Paradigm Shift in Waste Management in a Typical Developing Economy

Kesiena Owebor ,

Smith Otuagoma ,

Ogheneakpobo Eyenubo ,

Arthur Uranta ,

Friday Ukrakpor ,

Kesiena Ezewu and

Ebimene Ebisine

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

Abstract

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 th [...]

Open Access Research Article

Na⁺ Mobility in PEO-Based Composite Solid-State Electrolytes by NMR

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

Abstract

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 relaxati [...]

Open Access Review

Enhancement Techniques for the Reduction of Heating and Cooling Loads in Buildings: A Review

kamal Ismail ,

Fatima Lino ,

Jorge 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

Abstract

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 technique [...]

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