Abstract

The use of controlled beams of sunlight for lighting interior parts of a building is proposed as an economically attractive and practical option in a solar energy context. Sun tracking concentrators introduce beams of sunlight through holes in the roof. Inside, the beams can be relayed throughout the building by means of mirrors and lenses. Ideally cool lighting is obtained by using dielectric mirrors to separate the visible and ir parts of the solar spectrum. The ir can be used to generate electricity and usable heat in solar cells. Results of a preliminary experiment are given.

© 1977 Optical Society of America

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References

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  1. Astronaut. Aeronaut. 13, November1975. This issue contains a series of review articles on solar energy.
  2. W. Basich, A. Epstein Company; private communication.
  3. Made by Carson Astronomical Instruments, Inc.
  4. R. P. Stromberg, Sol. Energy 17, 359 (1975).
    [CrossRef]
  5. B. W. Marshall, Sandia Laboratories Report SAND75-0097, July1975.
  6. R. W. Harrigan, Sandia Laboratories Report SAND75-0542, 1975.
  7. D. G. Schueler, J. G. Fossum, E. L. Burgess, F. L. Vook, in Eleventh IEEE Photovoltaic Specialists Conference Record; Catalog No. 75CHO948-OED (IEEE, New York, 1975), p. 327.
  8. John N. Ott, Health and Light (Simon & Schuster, New York, 1976).

1975 (2)

Astronaut. Aeronaut. 13, November1975. This issue contains a series of review articles on solar energy.

R. P. Stromberg, Sol. Energy 17, 359 (1975).
[CrossRef]

Basich, W.

W. Basich, A. Epstein Company; private communication.

Burgess, E. L.

D. G. Schueler, J. G. Fossum, E. L. Burgess, F. L. Vook, in Eleventh IEEE Photovoltaic Specialists Conference Record; Catalog No. 75CHO948-OED (IEEE, New York, 1975), p. 327.

Fossum, J. G.

D. G. Schueler, J. G. Fossum, E. L. Burgess, F. L. Vook, in Eleventh IEEE Photovoltaic Specialists Conference Record; Catalog No. 75CHO948-OED (IEEE, New York, 1975), p. 327.

Harrigan, R. W.

R. W. Harrigan, Sandia Laboratories Report SAND75-0542, 1975.

Marshall, B. W.

B. W. Marshall, Sandia Laboratories Report SAND75-0097, July1975.

Ott, John N.

John N. Ott, Health and Light (Simon & Schuster, New York, 1976).

Schueler, D. G.

D. G. Schueler, J. G. Fossum, E. L. Burgess, F. L. Vook, in Eleventh IEEE Photovoltaic Specialists Conference Record; Catalog No. 75CHO948-OED (IEEE, New York, 1975), p. 327.

Stromberg, R. P.

R. P. Stromberg, Sol. Energy 17, 359 (1975).
[CrossRef]

Vook, F. L.

D. G. Schueler, J. G. Fossum, E. L. Burgess, F. L. Vook, in Eleventh IEEE Photovoltaic Specialists Conference Record; Catalog No. 75CHO948-OED (IEEE, New York, 1975), p. 327.

Astronaut. Aeronaut. (1)

Astronaut. Aeronaut. 13, November1975. This issue contains a series of review articles on solar energy.

Sol. Energy (1)

R. P. Stromberg, Sol. Energy 17, 359 (1975).
[CrossRef]

Other (6)

B. W. Marshall, Sandia Laboratories Report SAND75-0097, July1975.

R. W. Harrigan, Sandia Laboratories Report SAND75-0542, 1975.

D. G. Schueler, J. G. Fossum, E. L. Burgess, F. L. Vook, in Eleventh IEEE Photovoltaic Specialists Conference Record; Catalog No. 75CHO948-OED (IEEE, New York, 1975), p. 327.

John N. Ott, Health and Light (Simon & Schuster, New York, 1976).

W. Basich, A. Epstein Company; private communication.

Made by Carson Astronomical Instruments, Inc.

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Figures (2)

Fig. 1
Fig. 1

System proposed to distribute direct sunlight throughout a building for lighting. Mirror F is a dielectric filter which reflects the visible part (4000–7000 Å) of the solar spectrum and transmits the ir. Cool sunlight reflected from F is spread around the room by mirrors and diffusers; part of the sunlight is relayed by lens L2 to light the next story.

Fig. 2
Fig. 2

This photograph shows two overlapping images of the sun, a broad spot of white sunlight on the diffuser placed over the desk, and a color dispersed image of the sun at right. The sunlighting system can perform through certain types of clouds, which can be seen running across the sun’s disk.

Equations (4)

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r t = 0.65 × 9 GJ / yr × $ 2 / GJ = $ 12 / yr .
r e = 0.20 × 0.65 × 9 GJ / yr × $ 10 / GJ = $ 12 / yr .
r i = 0.45 × 0.65 × 9 GJ / yr × $ 60 / GJ = $ 158 / yr .
0.7 r i = $ 110 / yr ,

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