Passive radiative cooling of a body
| DWPI Title: Metallic waveguide for providing specified spectral and spatial thermal radiation emissivity response, has metallic waveguide main portion to establish direction of spectral and thermal radiation emissivity response along waveguide axis |
| Abstract: A metallic waveguide tuned to an infrared region of interest provides spectral and spatial control over emitted/absorbed thermal radiation. The ratio of the depth of the waveguide to the smallest lateral dimension thereof is such that that the lateral dimension provides spectral selectivity and that the waveguide is deep enough for a fixed lateral dimension to establish directionality but is not so deep that it incurs severe ohmic losses. A panel with an array of such waveguides directs thermal radiation from a body in a specific direction and with a spectral response that is the result of the physical dimensions of the individual waveguides that make up the waveguide array and the arrangement of the waveguides in the array. The waveguide axis may be obliquely oriented with respect to the substrate normal so as to impart non-normal directionality to the emitted radiation with respect to the substrate normal surface. |
| Use: Metallic waveguide for providing specified spectral and spatial thermal radiation emissivity response to prescribed infrared (IR) region during passive radiative cooling of body in satellite. |
| Advantage: The heat radiation is enabled to pass through metal waveguides. |
| Novelty: The metallic waveguide (103) has a depth and a smallest lateral dimension. A ratio of the depth of the metallic waveguide to the smallest lateral dimension is such that the smallest lateral dimension of the metallic waveguide provides spectral selectivity. The metallic waveguide main portion is deep enough for the smallest lateral dimension to establish directionality of the specified spectral and thermal radiation emissivity response along an axis of the waveguide but is not so deep that ohmic loss causes the metallic waveguide to reabsorb radiation intended to be emitted. The specified spectral thermal emissivity response is such that the metallic waveguide rejects waves of wavelengths greater than about two times a width of metallic waveguide. |
| Filed: 11/24/2015 |
| Application Number: US14950298A |
| Tech ID: SD 13494.0 |
| This invention was made with Government support under Contract No. DE-NA0003525 awarded by the United States Department of Energy/National Nuclear Security Administration. The Government has certain rights in the invention. |
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