Global optimization of solar thermophotovoltaic systems

Datas Medina, Alejandro and Algora del Valle, Carlos (2013). Global optimization of solar thermophotovoltaic systems. "Progress in Photovoltaics: Research and Applications", v. 21 (n. 5); pp. 1040-1055. ISSN 1062-7995.


Title: Global optimization of solar thermophotovoltaic systems
  • Datas Medina, Alejandro
  • Algora del Valle, Carlos
Item Type: Article
Título de Revista/Publicación: Progress in Photovoltaics: Research and Applications
Date: August 2013
Volume: 21
Freetext Keywords: solar thermophotovoltaic; detailed balance; energy balance; multijunction solar cells; sunlight concentration; spectral control; selective absorber
Faculty: Instituto de Energía Solar (IES) (UPM)
Department: Electrónica Física
Creative Commons Licenses: Recognition - No derivative works - Non commercial

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n this paper, we present a theoretical model based on the detailed balance theory of solar thermophotovoltaic systems comprising multijunction photovoltaic cells, a sunlight concentrator and spectrally selective surfaces. The full system has been defined by means of 2n + 8 variables (being n the number of sub-cells of the multijunction cell). These variables are as follows: the sunlight concentration factor, the absorber cut-off energy, the emitter-to-absorber area ratio, the emitter cut-off energy, the band-gap energy(ies) and voltage(s) of the sub-cells, the reflectivity of the cells' back-side reflector, the emitter-to-cell and cell-to-cell view factors and the emitter-to-cell area ratio. We have used this model for carrying out a multi-variable system optimization by means of a multidimensional direct-search algorithm. This analysis allows to find the set of system variables whose combined effects results in the maximum overall system efficiency. From this analysis, we have seen that multijunction cells are excellent candidates to enhance the system efficiency and the electrical power density. Particularly, multijunction cells report great benefits for systems with a notable presence of optical losses, which are unavoidable in practical systems. Also, we have seen that the use of spectrally selective absorbers, rather than black-body absorbers, allows to achieve higher system efficiencies for both lower concentration and lower emitter-to-absorber area ratio. Finally, we have seen that sun-to-electricity conversion efficiencies above 30% and electrical power densities above 50 W/cm2 are achievable for this kind of systems.

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Deposited by: Memoria Investigacion
Deposited on: 27 Jul 2014 10:25
Last Modified: 22 Sep 2014 11:43
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