Sánchez González, AlbertoGómez Hernández, Jesús2021-04-142022-02-012020-02Sánchez-González, A. & Gómez-Hernández, J. (2020). Beam-down linear Fresnel reflector: BDLFR. Renewable Energy, 146, pp. 802-815.0960-1481https://hdl.handle.net/10016/32354This paper presents a novel linear solar concentrating system named BDLFR, acronym of Beam-Down Linear Fresnel Reflector. A BDLFR system consists of a primary LFR array reflecting sunlight into a secondary hyperbolic -or elliptic- cylinder mirror that beams-downs reflected rays to its secondary focal line at ground level, where the receiver is placed. A model based on vector notation -and validated against SolTrace- predicts the optical behavior of BDLFR and generates layouts to avoid blockings. The edge ray approach is utilized to determine receiver aperture widths. As a function of beam-down curvature ratio, the BDLFR configurations that maximize solar collection are found out. Concentration ratios about 80 are reached with a tertiary re-concentrator (CPC) coupled to the receiver aperture.14eng© 2019 Elsevier Ltd.Atribución-NoComercial-SinDerivadas 3.0 EspañaBeam-down curvatureCompound parabolic concentratorFlux concentrationLayout optimizationLinear fresnel reflectorOptical efficiencyresearch articleEnergías Renovableshttps://doi.org/10.1016/j.renene.2019.07.017open access802815Renewable Energy146AR/0000025552