Rioglass 90mm PTR® 90-4G Receiver

Receiver for Parabolic Trough Collectors

Rioglass PTR 90-4G Data Sheet

Assembly

  • length: 4.060 mm ± 2,0 mm at 20°C ambient temperature
  • effective aperture length:
    ≥ 96.7 % of the bulk length at 350°C working temperature 1)

Absorber

  • outer diameter: 88,9 mm + 0,15 / – 0,35 mm
  • wall thickness: 2,5 mm + 0,25 / – 0,25 mm
  • steel-type: DIN 1.4541 or similar
  • average solar absorptance of all receivers delivered:
    αISO ≥ 0,957 (95,5%) 2)
    αASMT ≥ 0,960 (95,5%) 3)
  • absorptance of single absorber: αISO ≥ 0,945 2)
  •  average thermal emittance of all receivers delivered (400°C / 752ºF): ε ≤ 0.095) (9,5%) 4)
  • emittance of single absorber (400°C): ε ≤ 0.105 4)

Glass envelope

  • borosilicate glass 5)
  • outer diameter: 142 mm ± 2.5 mm
  • antireflective coating on ≥ 95,0% of aperture length
  • average solar transmittance of coated area of all receivers
    delivered: τ ≥ 0.970) (97 %) 2)
  • transmittance of single glass envelope in coated
    area: τ ≥ 0,960 2) (96,0 %) 2)

Weight

  • 35 kg ± 10% (unfilled)

Vacum

  • initial residual gas pressure ≤ 10-4 mbar

1) aperture length calculation based on nominal length of all Receiver components
2) according to ISO9845-1 for AM1.5 DNI-Spectrum in the range of 0,3….2,5 μm
3) according to ASTM(G173) for AM1.5 DNI-Spectrum in the range of 0,3….2,5 μm
4) for a blackbody spectrum of 400 °C
5) 100% proof test of glass-to-metal-seal