Computational model and optimisation of a vacuum diode thermionic generator for application in concentrating solar thermal power

Post, Alexander D.; King, Bruce V.; Kisi, Erich H.

Title: Computational model and optimisation of a vacuum diode thermionic generator for application in concentrating solar thermal power
Creator: Post, Alexander D.; King, Bruce V.; Kisi, Erich H.
Relation: Applied Thermal Engineering Vol. 117, p. 245-253
Publisher Link: http://dx.doi.org/10.1016/j.applthermaleng.2017.02.022
Publisher: Elsevier
Resource Type: journal article
Date: 2017
Description: A complete model of a thermionic generator has been developed in order to optimise the technology for application in the solar thermal generation of electricity. Steady state current densities predicted by the model have been shown to agree with published experimental thermionic data. Two separate genetic algorithm optimisations have been carried out for both power density and efficiency, in which electrode temperatures and work functions, external circuit resistance and electrode separation were varied. The result of these optimisations were two configurations separately exhibiting a maximum power density of 1.66 W/cm², and a maximum efficiency of 7.69% for parameter ranges applicable to concentrating solar thermal power. Examination of the optimum simulation parameters indicated that future developments in lowering collector work functions, increasing emitter service temperature and decreasing attainable electrode separations will all positively impact device performance.
Subject: genetic algorithm; thermionics; energy conversion; optimisation; plasmas; concentrating solar thermal
Identifier: http://hdl.handle.net/1959.13/1399192
Identifier: uon:34559
Identifier: ISSN:1359-4311
Language: eng
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