by Tyler Campbell  and Sergey Stolbov

Received: 16 February 2020;  Published: 20 April 2020;  doi: 10.21926/jept.2002003

In the search for new efficient photo-catalysts for hydrogen production through water splitting, the main attention has been paid to tuning the band gap width and its position with respect to vacuum level. However, actual electro-catalytic activity for the water oxidation reaction on a catalyst surface is no less important than those quantities. In this work we evaluate from first principles the thermodynamics of the reaction on relatively new candidates for water splitting: two-dimensional C2N and that doped with [...]

by Ryosuke Oochi  , Kengo Aoyama  and Akira Ueda

Received: 27 November 2019;  Published: 12 February 2020;  doi: 10.21926/jept.2001002

In order to achieve advancement in zero-emission geothermal power generation for fixing the CO2 in the geothermal fluids to the carbonate minerals after binary power generation and reinjection of the fluid into the reservoir, batch-type experiments and geochemical simulations of CO2-andesitic pyroclastic rock interaction (tuff from Oku-Aizu geothermal area) were performed at 150 °C with and without CO2 gas for 15 days. Despite the low Ca content (0.9% wt.%) in the rock, the Ca2+ concentrations in the solutions [...]

by Nikolai A. Zarkevich

Received: 30 September 2019;  Published: 06 January 2020;  doi: 10.21926/jept.2001001

Most power plants produce electricity by converting a mechanical motion into alternating current (AC). Photovoltaic solar panels convert an electromagnetic flux of light into direct current (DC). In general, electric energy can be harvested from a flux in the environment or from a change of the environment itself. One can produce electricity from mechanical, chemical, thermal, electromagnetic (light), or another physical flux, or from a change of temperature, chemical composition, or a physical field: gravitationa [...]

by Misirkhan A. Talybov  , Lala A. Azizova  and Ilmutdin M. Abdulagatov

Received: 24 September 2019;  Published: 24 December 2019;  doi: 10.21926/jept.1904006

Background: In the present study, vapor-pressures of three geothermal fluids from Baden-Baden geothermal field (Kirchenstollen, Friedrichstollen, and Murquelle, southeastern region of Germany) were measured over the temperature range of 274-413 K. The combined expanded uncertainty of the temperature and vapor-pressure measurements at 95% confidence level with a coverage factor of k = 2 were estimated to be 0.01 K and 1-3 Pa at low and 10-30 Pa at high temperatures, respectively. The measured values of vapor-pressur [...]

by Anna Karmazina  and Brent S. Steel

Received: 18 November 2019;  Published: 24 December 2019;  doi: 10.21926/jept.1904005

The 2013 Pacific Coast Action Plan on Climate and Energy signed by the Governors of Oregon, California, and Washington and the Premier of British Columbia, launched a broadly announced public commitment to reduce greenhouse gas emissions through multiple strategies. Those strategies include the development and increased use of renewable energy sources. The initiative recognized that citizens are both a central component to abating greenhouse gas emissions with regard to their energy use behaviors, and are important [...]

by Iman Rahimi  , Reza Behmanesh  and Abdollah Ahmadi

Received: 21 May 2019;  Published: 15 November 2019;  doi: 10.21926/jept.1904004

The aim of this paper is the scientometric analysis of articles on “scheduling in renewable energy” that have been published between 2000 and 2017. For this purpose, the terms “scheduling in renewable energy” and “unit commitment in renewable energy” have been searched. We have found 1009 articles in the Scopus database which include the terms mentioned above. VOSviewer and CiteSpace, as two well-known the scientometric analysis tools, have been used. Keywords analysis and citation analysis are two analysis methods [...]

by Ugo Chiocchini  and Giovanni Savarese

Received: 14 May 2019;  Published: 05 September 2019;  doi: 10.21926/jept.1903003

Background: The Regione Lazio-Direzione Regionale dello Sviluppo Economico e delle Attività Produttive (RL–DRSEAP), carrying out its public functions to govern the use of mineral resources (including thermal water), planned the exploitation of the Viterbo hydrothermal system on the basis of a conceptual hydrogeological model (CHM). The CHMs of the Viterbo area and that of the neighboring Tuscany region, characterized by the same geological and hydrogeological setting, are discussed, suggesting the unreliability of [...]

by Babkir Ali

Received: 30 May 2019;  Published: 07 August 2019;  doi: 10.21926/jept.1903002

The main objective of this paper is to study the sustainability of power generation from an abandoned oil and gas well in the province of Alberta, Canada. Economic and environmental indicators were used for the sustainability assessment. A conceptual design for a pilot plant was developed, and the main parameters were determined. An abandoned oil and gas well represents the thermal power source through circulating water into an organic Rankine cycle (ORC) unit to generate electricity. The thermal power is extracted [...]

by Babkir Ali

Received: 23 May 2019;  Published: 23 July 2019;  doi: 10.21926/jept.1903001

This paper is intended to evaluate the economic viability of producing solar photovoltaic modules in Sudan. The simple payback period and the net present value were used as economic indicators to study comparatively different annual production capacities. Initial and operating costs were developed and analyzed for the product lifecycle. The number of working shifts in the base case is doubled to achieve a production rate of 20 MW/year and double shift with double quantity of machines is executed to reach a producti [...]