Beam-down linear Fresnel reflector: BDLFR Articles uri icon

publication date

  • February 2020

start page

  • 802

end page

  • 815


  • 146

International Standard Serial Number (ISSN)

  • 0960-1481

Electronic International Standard Serial Number (EISSN)

  • 1879-0682


  • This 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.


  • Renewable Energies


  • beam-down curvature; compound parabolic concentrator; flux concentration; layout optimization; linear fresnel reflector; optical efficiency