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106 results on '"Hunt., Julian David"'

34. Electric truck gravity energy storage: An alternative to seasonal energy storage.

Author

Hunt, Julian David, Jurasz, Jakub, Zakeri, Behnam, Tong, Wenxuan, Nascimento, Andreas, Guo, Fei, Đurin, Bojan, Dąbek, Paweł, Wada, Yoshihide, van Ruijven, Bas, and Riahi, Keywan

Subjects
*ENERGY storage, *ALTERNATIVE fuels, *CLEAN energy, *ELECTRIC charge, *ELECTRICAL energy, *ELECTRIC trucks
Abstract

The global shift toward a sustainable and eco‐friendly energy landscape necessitates the adoption of long‐term, high‐capacity energy storage solutions. This research introduces an inventive energy storage concept involving the movement of granular materials from a lower elevation to a higher point within natural terrains such as mountains or excavated mining sites. Electrical energy is employed to charge electric batteries that elevate the granular material, thereby storing potential energy. Subsequently, this material is transported down during the electricity generation phase, and the regenerative braking mechanism converts the gravitational energy to replenish the vehicle's battery. The stored energy within these vehicles is then dispatched during peak demand periods or utilized by the vehicles for other freight transportation purposes. Our findings demonstrate a power cost of 1200 USD/kW, an energy storage expense spanning from 1 to 10 USD/kWh, a levelized cost of storage ranging from 35 to 200 USD/MWh, and a global annual potential of approximately 5.4 PWh. Electric vehicle gravity energy storage showcases its capability to bolster sustainable development by offering seasonal and multi‐year energy storage services. [ABSTRACT FROM AUTHOR]

Published
2024
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40. Ammonia Airship Cooling: An Option for Renewable Cooling in the Tropics.

Author

Hunt, Julian David, Zakeri, Behnam, Nascimento, Andreas, Guo, Fei, Freitas, Marcos Aurélio Vasconcelos de, Silva, Cristiano Vitorino, and van Ruijven, Bas

Subjects
*RENEWABLE energy sources, *COOLING, *HYDROGEN economy, *LIQUID hydrogen, *AIRSHIPS, DEVELOPING countries
Abstract

The world is warming, and the demand for cooling is increasing. Developing a future green hydrogen economy will also increase the demand for cooling for hydrogen liquefaction. This increase in cooling demand will happen mainly in tropical and developing countries due to their increase in population, improvements in quality of life, and the export of their renewable potential with liquid hydrogen. To solve this increase in demand for cooling, this paper proposes the use of ammonia airship cooling (AAC). AAC extracts cold from the tropopause (−80 °C) with airships and ammonia refrigeration cycles. The liquid ammonia is then transported back to the surface to provide low temperature cooling services (−33 °C). This cooling service is particularly interesting for lowering the electricity consumption in hydrogen liquefaction plants. If all the technological challenges mentioned in the paper are addressed, it is estimated that the cost of cooling with the technology is 8.25 USD/MWht and that AAC could reduce the electricity demand for hydrogen liquefaction by 30%. AAC is an innovative renewable cooling technology that has the potential to complement other renewable energy sources in a sustainable future. [ABSTRACT FROM AUTHOR]

Published
2024
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41. Integration of rationale management with multi-criteria decision analysis, probabilistic forecasting and semantics : application to the UK energy sector

Author

Hunt, Julian David and Bañares-Alcántara, René

Subjects
333.79, Environment, Game theory,economics,social and behavioral sciences (mathematics), Functions of a complex variable, Probability theory and stochastic processes, Logic, Cognition, Probability, Applications and algorithms, Software engineering, Game semantics, Program development and tools, Engineering & allied sciences, Chemical and process engineering, Information engineering, decision support systems, energy and water, probabilistic forecasting, semantics, decision ontology, energy ontology
Abstract

This thesis presents a new integrated tool and decision support framework to approach complex problems resulting from the interaction of many multi-criteria issues. The framework is embedded in an integrated tool called OUTDO (Oxford University Tool for Decision Organisation). OUTDO integrates Multi-Criteria Decision Analysis (MCDA), decision rationale management with a modified Issue-Based Information Systems (IBIS) representation, and probabilistic forecasting to effectively capture the essential reasons why decisions are made and to dynamically re-use the rationale. In doing so, it allows exploration of how changes in external parameters affect complicated and uncertain decision making processes in the present and in the future. Once the decision maker constructs his or her own decision process, OUTDO checks if the decision process is consistent and coherent and looks for possible ways to improve it using three new semantic-based decision support approaches. For this reason, two ontologies (the Decision Ontology and the Energy Ontology) were integrated into OUTDO to provide it with these semantic capabilities. The Decision Ontology keeps a record of the decision rationale extracted from OUTDO and the Energy Ontology describes the energy generation domain, focusing on the water requirement in thermoelectric power plants. A case study, with the objective of recommending electricity generation and steam condensation technologies for ten different regions in the UK, is used to verify OUTDO’s features and reach conclusions about the overall work.

Published
2013

50. Assessing Sustainable Ecotourism Opportunities in Western Rajasthan, India, through Advanced Geospatial Technologies.

Author

Chandel, Rajeev Singh, Kanga, Shruti, Singh, Suraj Kumar, Ðurin, Bojan, Oršulić, Olga Bjelotomić, Dogančić, Dragana, and Hunt, Julian David

Abstract

The present study focuses on finding potential sites for ecotourism development using GIS and remote-sensing-based weightage sum overlay techniques in Western Rajasthan, India. Ecotourism is one of the fastest growing and revenue-making sectors incorporating a sustainable future. Western Rajasthan has a broad scope to develop tourism-based activity in various ways, mainly through cultural heritage, historical and archaeological wonders, and rare wildlife. Weightage sum overlay analysis is a useful and simple tool to compare each thematic layer. These values are based on various factors and understanding taken during the study. For this purpose, different data types have been taken from the USGS website. Arc GIS 10.8 and ERDAS Imagine software 2015 have been utilized to process the data. This research incorporates seven thematic layers, i.e., elevation, proximity to streams, land use/cover, population density, road connectivity, proximity to protected areas, and heritage hotspots. Based on the physical and cultural characteristics of Western Rajasthan, the weightage of each thematic layer has been decided, which is finally overlaid using Arc GIS software. After processing all the thematic layers, we finally get an outcome in the form of a suitability map. The final suitability map represents five suitability classes that divide the total area into the following categories, very high (37.31%), high (26.85%), moderate (7.89%), low (0.83%), and very low (27.12%), which represents the potential of ecotourism in Western Rajasthan. [ABSTRACT FROM AUTHOR]

Published
2023
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