Research Article
Numerical, Modeling of a Solar Cooker of Box Type to Solar Concentrator
Thierry Serge Gbembongo*,
Vinci de Dieu Bokoyo Barandja,
Emile Boris Kenza
Issue:
Volume 12, Issue 1, April 2024
Pages:
1-9
Received:
15 May 2023
Accepted:
14 July 2023
Published:
18 January 2024
Abstract: A numerical computer code simulating the operation of a solar cooker of box type to solar concentrator was established. The computer code was used to study the effect of the thermal performance of the cooker. The aim of this work is to present a mathematical model of this solar cooker model in comparison with other models, and to analyze the various parameters that influence the cooker's thermal performance. The equations governing heat transfer in this solar cooker are deduced from the analogy between heat transfer and electrical transfer. These equations are discretized and solved by an implicit finite-difference method, using Gauss' algorithm coupled with an iterative procedure. he results show that an optimum solar flux of 900W/m² was used to determine the various optimum parameters. We deduce that the mirror is a good reflector, and for optimal dimensions of the parallelepiped enclosure [60cm*50cm*50cm], the thermal efficiency of the cooker varies from 42 to 45%. The influence of different pot wall materials shows that copper is a good conductor, and the influence of pot wall dimensions shows that a thin wall (3mm) increases thermal conductivity.
Abstract: A numerical computer code simulating the operation of a solar cooker of box type to solar concentrator was established. The computer code was used to study the effect of the thermal performance of the cooker. The aim of this work is to present a mathematical model of this solar cooker model in comparison with other models, and to analyze the variou...
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Research Article
A Roadmap for Detroit to Bolster E-bus Adoption by 2033
Pengyu Tang*,
Ziyang Zhang,
Xinhang Li,
Yixi Wu
Issue:
Volume 12, Issue 1, April 2024
Pages:
10-16
Received:
15 December 2023
Accepted:
3 January 2024
Published:
18 January 2024
Abstract: Compared with internal combustion engine vehicles, electronic vehicles are quiet and comfortable, with no noise from the engine, no consumption of fossil fuels, and no emission of smelly air pollutants. The only drawback of electronic vehicles is they take a long time for the batteries to be charged. This could be solved by optimizing bus routes, building more charge stations, and adopting fast charge technology. In this paper, the ecological and financial consequences of replacing diesel buses with electronic buses is analyzed. As the result shows it not only saves energy and reduces the emission of air pollutants, but also minimizes the operational costs and therefore greatly increases the profits. A model based on revenue and expenditure is built, which is capable of plotting a detailed roadmap, with the specific number of electronic buses to upgrade, and the forecast of corresponded financial implication on expenses and income year by year. Based on the model, two different kinds of path of transition are analyzed. The first kind is to do it slowly and upgrade only a limited number of electronic buses every year, especially in the beginning years. This kind of plan would minimize the external funding needed during the transition, but cannot repay the external funding by the end of 10 years. The other kind is to upgrade as many electronic buses as the external funding could provide at the beginning. Although it would cause a heavy burden on fiscal revenue, the transition can be achieved faster and make more profits by the end of 10 years, eventually able to repay the external funding.
Abstract: Compared with internal combustion engine vehicles, electronic vehicles are quiet and comfortable, with no noise from the engine, no consumption of fossil fuels, and no emission of smelly air pollutants. The only drawback of electronic vehicles is they take a long time for the batteries to be charged. This could be solved by optimizing bus routes, b...
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Research Article
Application Prospect of Carbon Dioxide Hydrogenation to Methanol Technology in the New Electric Power Systems
Xin Nie*
Issue:
Volume 12, Issue 1, March 2024
Pages:
17-25
Received:
14 February 2024
Accepted:
12 March 2024
Published:
2 April 2024
Abstract: The new electric power systems based on new energy is a power system that is supported by source-grid-load-storage interaction and multi-energy complementarity, in order to reduce the carbon emission level of the new electric power systems, it is necessary to change the existing energy structure of the system through different energy carriers. Through technology comparison and analysis, seawater in-situ electrolysis hydrogen production technology can make full use of offshore renewable energy, which can effectively reduce the production cost of hydrogen production by electrolysis. With the development and industrial application of the third-generation low-energy phase change absorber, the technology of carbon dioxide capture by phase change solvent has great application prospects. The industrial application of carbon dioxide hydrogenation to methanol can rely on the existing mature C1 chemical system, and the new carbon dioxide hydrogenation to methanol device can improve the effective utilization rate of carbon dioxide and reduce the emission of tail gas. On this basis, the application scheme of carbon dioxide hydrogenation to methanol technology in the new power system is proposed: centered on the power grid, renewable energy is used to generate electricity, and part of the electricity is sent to the grid; part of the electricity is sent to the seawater in-situ electrolysis hydrogen production unit to produce hydrogen; the main product hydrogen is stored in the hydrogen storage equipment, and the by-product oxygen is used comprehensively; the carbon dioxide generated in the process of fossil fuel power generation is captured by phase change solvent, and then the new carbon dioxide hydrogenation to methanol device is used to synthesize carbon dioxide and hydrogen into methanol under the action of catalyst, part of the methanol is converted into hydrogen by cracking and stored, and the other part of methanol is directly used as the fuel of internal combustion power locomotives, when the power output of the grid is insufficient, methanol can be used as fuel for internal combustion generators, which are used to generate electricity and sent to the grid, and the stored hydrogen can also be used as fuel for hydrogen fuel cells, which are used to generate electricity and sent to the grid.
Abstract: The new electric power systems based on new energy is a power system that is supported by source-grid-load-storage interaction and multi-energy complementarity, in order to reduce the carbon emission level of the new electric power systems, it is necessary to change the existing energy structure of the system through different energy carriers. Thro...
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