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A receiver system for harnessing solar radiation. Embodiments of a receiver system include a receiver including one or more receiver elements, each receiver element including: a plurality of transparent tubes including a first tube and at least one second tube at least partially within the first tub

A receiver system for harnessing solar radiation. Embodiments of a receiver system include a receiver including one or more receiver elements, each receiver element including: a plurality of transparent tubes including a first tube and at least one second tube at least partially within the first tube; a first passage interposed between the first tube and the at least one second tube, the first passage having an inlet and an outlet; a second passage within the at least one second tube, the second passage having an inlet and an outlet; and an absorber in the at least one second tube, the absorber adapted to absorb the solar radiation. In some embodiments, a receiver further includes a housing having at least one transparent portion, the housing configured to enclose the plurality of receiver elements, whereby a third passage is formed between the first tube and the housing.

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1. A receiver system for harnessing solar radiation, the receiver system comprising: a tower mounted solar receiver comprising: a plurality of substantially rigid transparent tubes comprising: an outer transparent tube; andan inner transparent tube at least partially within the outer transparent tub

1. A receiver system for harnessing solar radiation, the receiver system comprising: a tower mounted solar receiver comprising: a plurality of substantially rigid transparent tubes comprising: an outer transparent tube; andan inner transparent tube at least partially within the outer transparent tube;a gas passage within the plurality of transparent tubes, the gas passage having a first gas inlet and a first gas outlet;a first heat absorber, the first heat absorber disposed in the gas passage, wherein the first heat absorber is comprised of at least one elongated strand having at least one fold;a casing wall having a closed geometric shape, and a window wall disposed within a perimeter of the casing wall, the plurality of transparent tubes being disposed between the casing wall and the window wall; anda heat exchange gas passage interposed between the casing wall and the window wall and outside of the plurality of transparent tubes, the heat exchange gas passage having a second gas inlet and a second gas outlet. 2. The receiver system of claim 1, wherein the first heat absorber comprises at least one material selected from the group consisting of nickel alloys, silicon carbide, carbon steel, and copper. 3. The receiver system of claim 1, wherein the at least one elongated strand of the first heat absorber has a pattern of the at least one fold that is irregular or pseudo-random. 4. The receiver system of claim 1, wherein the first heat absorber has an exterior finish having a solar radiation absorption coefficient between about 0.5 and 1. 5. The receiver system of claim 4, wherein an exterior surface of the first heat absorber comprises black paint. 6. The receiver system of claim 2, wherein the first heat absorber comprises a first absorber member of a first material and a second absorber member of a second material different than the first material. 7. The receiver system of claim 6, wherein: the first absorber member comprises at least one material selected from the group consisting of carbon steel and copper,the second absorber member comprises at least one material selected from the group consisting of nickel alloys and silicon carbide. 8. The receiver system of claim 1, wherein the first heat absorber occupies a volume between about 1 percent and about 20 percent of a volume of the gas passage, and a ratio of a first heat absorber surface area to a first heat absorber frontal area is at least 6 to 1. 9. The receiver system of claim 8, wherein the first heat absorber occupies a volume of about 10 percent of the volume of the gas passage. 10. The receiver system of claim 1, wherein a longitudinal axis of at least one of the substantially rigid transparent tubes is tiltable relative to one or more heliostats directing the solar radiation toward the at least one substantially rigid transparent tube. 11. The receiver system of claim 1, wherein substantially rigid transparent tubes of the plurality of substantially rigid transparent tubes have longitudinal axes tilted at different angles from one another relative to one or more heliostats directing the solar radiation toward the substantially rigid transparent tubes. 12. A receiver system for harnessing solar radiation, the receiver system comprising: a tower mounted solar receiver comprising: a transparent window wall;an opaque casing wall having a closed geometric shape, wherein the window wall is disposed within a perimeter of the casing wall;one or more transparent receiver elements disposed between the window wall and the casing wall;a heat exchange gas passage interposed between the window wall and the casing wall and outside of the one or more receiver elements, the heat exchange gas passage having a first gas inlet and a first gas outlet;a gas passage within each of the one or more transparent receiver elements, the gas passage having a second gas inlet and a second gas outlet; anda first heat absorber, the first heat absorber disposed in the gas passage and having a porous structure. 13. The receiver system of claim 12, wherein each of the one or more transparent receiver elements comprises: a transparent inner tube, wherein the gas passage is disposed within the transparent inner tube;a transparent outer tube, wherein the transparent outer tube is disposed about the transparent inner tube; andan intertube heat exchange gas passage between the transparent outer tube and the transparent inner tube, the intertube heat exchange gas passage having a third gas inlet and a third gas outlet. 14. The receiver system of claim 13, wherein the third gas outlet is coupled to the second gas inlet, whereby a gas can flow from the intertube heat exchange gas passage to the gas passage.