Selective emitters

Details Selective emitters Selective emitters

1990-03-30

1992-01-14

Weisstuch, Aaron

Batteries: thermoelectric and photoelectric

Photoelectric

Cells

H01C 31058

Patent

active

050807242

ABSTRACT:
This invention relates to a small particle selective emitter for converting thermal energy into narrow band radiation with high efficiency. The small particle selective emitter is used in combination with a photovoltaic array to provide a thermal to electrical energy conversion device. An energy conversion apparatus of this type is called a thermo-photovoltaic device.
In the first embodiment, small diameter particles of a rare earth oxide are suspended in an inert gas enclosed between concentric cylinders as shown in FIG. 1. The rare earth oxides are used because they have the desired property of large emittance in a narrow wavelength band and small emittance outside the band. However, it should be emphasized that it is the smallness of the particles that enhances the radiation property. As shown in FIG. 1, the small particle selective emitter is surrounded by a photovoltaic array.
In an alternate embodiment, the small particle gas mixture is circulated through a thermal energy source as shown in FIG. 2. This thermal energy source can be a nuclear reactor, solar receiver, or combustor of a fossil fuel.

REFERENCES:
patent: 3751303 (1973-08-01), Kittl
patent: 3929510 (1975-12-01), Kittl
patent: 4584426 (1986-04-01), Nelson
patent: 4707560 (1987-11-01), Hottel et al.
patent: 4746370 (1988-05-01), Woolf
patent: 4750943 (1988-06-01), Nelson
patent: 4776895 (1988-10-01), Goldstein
patent: 4836862 (1989-06-01), Pelka et al.

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