Evaluation of two fiber optic-based solar collection and distribution systems for advanced space life support

Darren A. Jack, Takashi Nakamura, Philip Sadler, Joel L Cuello

Research output: Contribution to journalArticle

7 Citations (Scopus)

Abstract

Growing plants in an enclosed controlled environment is crucial in developing bioregenerative life-support systems (BLSS) for space applications. The major challenge currently facing a BLSS is the extensive use of highly energy-intensive electric light sources, which leads to substantial energy wastes through heat dissipations by these lamps. An alternative lighting strategy is the use of a solar irradiance collection, transmission, and distribution system (SICTDS). Two types of fiber optic-based SICTDS, a Fresnel-lens Himawari and a parabolic-mirror optical waveguide (OW) lighting system, were evaluated. The overall efficiency for the OW SICTDS of 40.5% exceeded by 75% that for the Himawari of 23.2%. The spectral distributions of the light delivered by the Himawari and the OW SICTDS were almost identical and had practically no difference from that of terrestrial solar radiation. The ratios of photosynthetically active radiation (PAR) to total emitted radiation (k) of 0.39 ±0.02 for the Himawari and 0.41 ±0.04 for the OW SICTDS were statistically indistinguishable, were not significantly different from that of 0.042 ±0.01 for terrestrial solar radiation, and were comparable to that of 0.35 for a high-pressure sodium (HPS) lamp. The coefficients of variation (CV) of 0.34 and 0.39 for PPF distributions, both at 50 mm x 50 mm square grid arrays, corresponding to the Himawari and the OW SICTDS, respectively, were comparable with each other but were both significantly greater than the CV of 0.08 corresponding to the HPS lamp. The average fresh weight or dry weight of lettuce grown in the solar chamber with either the Himawari or the OW SICTDS showed no statistical difference from the average fresh weight or dry weight of lettuce grown in the reference chamber with the HPS lamp. The results of this study suggest that an SICTDS could help reduce the electric power demand in a BLSS.

Original languageEnglish (US)
Pages (from-to)1547-1558
Number of pages12
JournalTransactions of the American Society of Agricultural Engineers
Volume45
Issue number5
StatePublished - Sep 2002

Fingerprint

fiber optics
Life Support Systems
distribution system
Optical waveguides
Fiber optics
irradiance
solar radiation
Radiation
Weights and Measures
Lettuce
Electric lamps
Sodium
Lighting
Pressure
support systems
Light
Controlled Environment
Solar radiation
sodium
Lenses

Keywords

  • Advanced life support
  • Controlled environment
  • Fiber optic cable
  • Hydroponics
  • Solar collector

ASJC Scopus subject areas

  • Agricultural and Biological Sciences (miscellaneous)

Cite this

Evaluation of two fiber optic-based solar collection and distribution systems for advanced space life support. / Jack, Darren A.; Nakamura, Takashi; Sadler, Philip; Cuello, Joel L.

In: Transactions of the American Society of Agricultural Engineers, Vol. 45, No. 5, 09.2002, p. 1547-1558.

Research output: Contribution to journalArticle

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abstract = "Growing plants in an enclosed controlled environment is crucial in developing bioregenerative life-support systems (BLSS) for space applications. The major challenge currently facing a BLSS is the extensive use of highly energy-intensive electric light sources, which leads to substantial energy wastes through heat dissipations by these lamps. An alternative lighting strategy is the use of a solar irradiance collection, transmission, and distribution system (SICTDS). Two types of fiber optic-based SICTDS, a Fresnel-lens Himawari and a parabolic-mirror optical waveguide (OW) lighting system, were evaluated. The overall efficiency for the OW SICTDS of 40.5{\%} exceeded by 75{\%} that for the Himawari of 23.2{\%}. The spectral distributions of the light delivered by the Himawari and the OW SICTDS were almost identical and had practically no difference from that of terrestrial solar radiation. The ratios of photosynthetically active radiation (PAR) to total emitted radiation (k) of 0.39 ±0.02 for the Himawari and 0.41 ±0.04 for the OW SICTDS were statistically indistinguishable, were not significantly different from that of 0.042 ±0.01 for terrestrial solar radiation, and were comparable to that of 0.35 for a high-pressure sodium (HPS) lamp. The coefficients of variation (CV) of 0.34 and 0.39 for PPF distributions, both at 50 mm x 50 mm square grid arrays, corresponding to the Himawari and the OW SICTDS, respectively, were comparable with each other but were both significantly greater than the CV of 0.08 corresponding to the HPS lamp. The average fresh weight or dry weight of lettuce grown in the solar chamber with either the Himawari or the OW SICTDS showed no statistical difference from the average fresh weight or dry weight of lettuce grown in the reference chamber with the HPS lamp. The results of this study suggest that an SICTDS could help reduce the electric power demand in a BLSS.",
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