A Highly Stable and Sustainable Low-Temperature Selective Absorber: Structural and Ageing Characterisation
Solar absorbers in a three-layer configuration have been prepared by dip-coating onto aluminium substrates. They are constituted by two spinel layers with one silica layer on the top and values of solar absorptance above 0.950 and thermal emittance below 0.04 were obtained. The effects of using diff...
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| Format: | Article |
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MDPI AG
2022-05-01
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| Series: | Materials |
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| Online Access: | https://www.mdpi.com/1996-1944/15/10/3427 |
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| author | Meryem Farchado Gema San Vicente Nuria Germán César Maffiotte Ángel Morales |
| author_facet | Meryem Farchado Gema San Vicente Nuria Germán César Maffiotte Ángel Morales |
| author_sort | Meryem Farchado |
| collection | DOAJ |
| description | Solar absorbers in a three-layer configuration have been prepared by dip-coating onto aluminium substrates. They are constituted by two spinel layers with one silica layer on the top and values of solar absorptance above 0.950 and thermal emittance below 0.04 were obtained. The effects of using different sintering conditions of the upper silica layer on the optical behaviour and durability tests have been studied. Results obtained in accelerated ageing methods, such as thermal stability tests and condensation tests, clearly show that the proposed selective absorber exhibits excellent thermal stability and very good humidity resistance. The results show that the protective action is due not only to the silica layer but also to the alumina layer produced during the absorber preparation. The phase composition of the individual layers was independently confirmed using X-ray diffraction and corroborated by X-ray Photoelectron Spectroscopy. Spinel-like phases were obtained in both the first and second layers. The ageing study shows that the three-layer configuration proposed has a very high potential, in terms of both durability and optical behaviour, for solar thermal low-temperature applications. |
| first_indexed | 2024-03-10T03:31:55Z |
| format | Article |
| id | doaj.art-79675ba5ef314bc4a02e350ae68b4c18 |
| institution | Directory Open Access Journal |
| issn | 1996-1944 |
| language | English |
| last_indexed | 2024-03-10T03:31:55Z |
| publishDate | 2022-05-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Materials |
| spelling | doaj.art-79675ba5ef314bc4a02e350ae68b4c182023-11-23T11:55:17ZengMDPI AGMaterials1996-19442022-05-011510342710.3390/ma15103427A Highly Stable and Sustainable Low-Temperature Selective Absorber: Structural and Ageing CharacterisationMeryem Farchado0Gema San Vicente1Nuria Germán2César Maffiotte3Ángel Morales4Unidad de Materiales para Tecnologías Termosolares de Concentración, Plataforma Solar de Almería, Departamento de Energía, Centro de Investigaciones Energéticas, Medioambientales y Tecnológicas (CIEMAT), Avda. Complutense 40, 28040 Madrid, SpainUnidad de Materiales para Tecnologías Termosolares de Concentración, Plataforma Solar de Almería, Departamento de Energía, Centro de Investigaciones Energéticas, Medioambientales y Tecnológicas (CIEMAT), Avda. Complutense 40, 28040 Madrid, SpainUnidad de Materiales para Tecnologías Termosolares de Concentración, Plataforma Solar de Almería, Departamento de Energía, Centro de Investigaciones Energéticas, Medioambientales y Tecnológicas (CIEMAT), Avda. Complutense 40, 28040 Madrid, SpainDivisión de Materiales de Interés Energético, Departamento de Tecnología, Centro de Investigaciones Energéticas, Medioambientales y Tecnológicas (CIEMAT), Avda. Complutense 40, 28040 Madrid, SpainUnidad de Materiales para Tecnologías Termosolares de Concentración, Plataforma Solar de Almería, Departamento de Energía, Centro de Investigaciones Energéticas, Medioambientales y Tecnológicas (CIEMAT), Avda. Complutense 40, 28040 Madrid, SpainSolar absorbers in a three-layer configuration have been prepared by dip-coating onto aluminium substrates. They are constituted by two spinel layers with one silica layer on the top and values of solar absorptance above 0.950 and thermal emittance below 0.04 were obtained. The effects of using different sintering conditions of the upper silica layer on the optical behaviour and durability tests have been studied. Results obtained in accelerated ageing methods, such as thermal stability tests and condensation tests, clearly show that the proposed selective absorber exhibits excellent thermal stability and very good humidity resistance. The results show that the protective action is due not only to the silica layer but also to the alumina layer produced during the absorber preparation. The phase composition of the individual layers was independently confirmed using X-ray diffraction and corroborated by X-ray Photoelectron Spectroscopy. Spinel-like phases were obtained in both the first and second layers. The ageing study shows that the three-layer configuration proposed has a very high potential, in terms of both durability and optical behaviour, for solar thermal low-temperature applications.https://www.mdpi.com/1996-1944/15/10/3427solar selective absorberspineldip-coatingstructural propertiesdurability |
| spellingShingle | Meryem Farchado Gema San Vicente Nuria Germán César Maffiotte Ángel Morales A Highly Stable and Sustainable Low-Temperature Selective Absorber: Structural and Ageing Characterisation Materials solar selective absorber spinel dip-coating structural properties durability |
| title | A Highly Stable and Sustainable Low-Temperature Selective Absorber: Structural and Ageing Characterisation |
| title_full | A Highly Stable and Sustainable Low-Temperature Selective Absorber: Structural and Ageing Characterisation |
| title_fullStr | A Highly Stable and Sustainable Low-Temperature Selective Absorber: Structural and Ageing Characterisation |
| title_full_unstemmed | A Highly Stable and Sustainable Low-Temperature Selective Absorber: Structural and Ageing Characterisation |
| title_short | A Highly Stable and Sustainable Low-Temperature Selective Absorber: Structural and Ageing Characterisation |
| title_sort | highly stable and sustainable low temperature selective absorber structural and ageing characterisation |
| topic | solar selective absorber spinel dip-coating structural properties durability |
| url | https://www.mdpi.com/1996-1944/15/10/3427 |
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