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Highly Improved Thermionic Energy Converter

De, Dilip Kumar and Olawole, C. Olukunle and Oyedepo, Sunday Olayinka and Joel, E. S. and Olawole, O. F. and Emetere, Moses and Omeje, Maxwell and Ikono, U. I. and Nguyen, H. M. (2019) Highly Improved Thermionic Energy Converter. In: International Conference on Engineering for Sustainable World, 2019, Online.

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Thermionic energy converter (TEC) has recently received significant attention, for it holds potential for clean energy generation with a very high theoretical conversion efficiency (60%). For the latter to be achieved, some of the key hurdles are to be overcome. This paper discusses all these key hurdles along with modelling of solar energy conversion using a TEC with nano-materials and metals, using the modified Richardson-Dushman equation, which best describes the thermionic emission current density from these materials. Using two scenarios: allowing natural heat radiation from the back surface of the collector and using controlled heat collection from the collector to maintain it at a fixed temperature. We then discuss results of simulation of the conversion efficiency as a function of temperatures of emitter and collector, work functions and Fermi energy of emitter and collector at absolute zero temperature, solar insolation, the radius of parabolic concentrator and emissivity of radiating surfaces. We discuss the impact of neglecting the radiation losses on the efficiency evaluation as has been done by other workers recently. We suggest some innovative ways to reduce significantly the space charge effect to make a solar TEC a reality.

Item Type: Conference or Workshop Item (Paper)
Uncontrolled Keywords: Thermionic energy converter; solar energy; modelling; modified Richardson-Dushman equation; metals; nanomaterials; high conversion efficiency; clean energy, parabolic concentrator.
Subjects: Q Science > QC Physics
Divisions: Faculty of Engineering, Science and Mathematics > School of Physics
Depositing User: Patricia Nwokealisi
Date Deposited: 04 Jun 2024 14:57
Last Modified: 04 Jun 2024 14:57

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