Dual Loop line-focusing solar power plants with supercritical Brayton power cycles |
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| Authors: | L Coco-Enríquez J Muñoz-Antón JM Martínez-Val |
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| Affiliation: | GIT-Universidad Politécnica de Madrid, José Gutiérrez Abascal 2, 28006, Madrid, Spain |
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| Abstract: | This study is focused on proposing the combination of a Dual Loop solar field, with Dowtherm A and the Solar Salt as heat transfer fluids in parabolic or linear Fresnel solar collectors, coupled to supercritical Carbon Dioxide (s-CO2) Brayton power cycle. The Dual-Loop justification relies on gaining the synergies provided by the different heat transfer fluids properties. The oils advantages are related with the operating experience accumulated in numerous solar power plants deployed around the World, assuring the commercial equipment availability. Also the pipes metal corrosion with oil is much lower than with molten salt. The pipes material cost saving is significant with the oil alternative. The thermal oil main constraint is imposed by the maximum operating temperature (around 400 °C) for avoiding chemical decomposition and degradation, stablishing the plant threshold efficiency 37% due to Carnot principle. On the other hand the Solar Salt mixture (60%NaNO3 | |
| Keywords: | Dual Loop solar field Thermal oil Molten salt Supercritical Carbon Dioxide Parabolic trough Linear Fresnel |
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