Experimental assessment of different compact flow channel geometries on pressurised gas solar receivers
Pressurised gas receivers using optimised compact flow channels exhibit promising thermal performance in concentrated solar thermal systems, paving the way to integrate solar energy in high efficiency thermodynamic power cycles and industrial heat processes. This work is focused on the experimental...
| Autores: | , , , |
|---|---|
| Formato: | artículo |
| Fecha de publicación: | 2025 |
| País: | España |
| Recursos: | Universidad Nacional de Educación a Distancia |
| Repositorio: | e-spacio. Repositorio Institucional de la UNED |
| Idioma: | inglés |
| OAI Identifier: | oai:e-spacio.uned.es:20.500.14468/30352 |
| Acesso em linha: | https://hdl.handle.net/20.500.14468/30352 |
| Access Level: | acceso abierto |
| Palavra-chave: | 3322 Tecnología energética Compact channel Experimental characterisation Pressurised gas Solar receive Concentrated solar thermal Parametric analysis |
| Resumo: | Pressurised gas receivers using optimised compact flow channels exhibit promising thermal performance in concentrated solar thermal systems, paving the way to integrate solar energy in high efficiency thermodynamic power cycles and industrial heat processes. This work is focused on the experimental characterisation of several compact absorber samples, in order to verify previous numerical analysis aimed at maximising thermal efficiency while simultaneously minimising pressure drop. Four variants of plain rectangular channel absorber samples were fabricated varying channel height, breadth and wall thickness. Each absorber sample was experimentally studied by varying mass flow rate, inlet pressure and incident radiation flux. The experimental campaign verified important findings and predictions of a previously developed numerical model including that the maximum thermal efficiency and pressure drop occurs at the smallest channel size besides the positive effect of taller and narrower channels. The maximum thermal efficiency observed was 95.8% with the corresponding pressure drop measured at 6.3% of the inlet pressure. This performance, in terms of thermal efficiency and relative pressure drops, is on par and even surpasses the state-of-the-art receivers of its type. Such high thermal efficiencies (above 90%) and low relative pressure drops (below 3%) were also observed for other operating conditions and absorber geometries as well. |
|---|