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US 9,103,719 B1Granted
Computation of glint, glare, and solar irradiance distribution
AssigneeSandia Corporation
InventorsClifford Kuofei Ho, Siri Sahib Singh Khalsa
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Abstract
Described herein are technologies pertaining to computing the solar irradiance distribution on a surface of a receiver in a concentrating solar power system or glint/glare emitted from a reflective entity. At least one camera captures images of the Sun and the entity of interest, wherein the images have pluralities of pixels having respective pluralities of intensity values. Based upon the intensity values of the pixels in the respective images, the solar irradiance distribution on the surface of the entity or glint/glare corresponding to the entity is computed.
Claims12
A method, comprising:
- receiving an electronic image of the Sun that comprises a first plurality of pixels that have a first plurality of values;
- receiving an electronic image of an entity that receives solar radiation that comprises a second plurality of pixels that have a second plurality of values;
- and
- causing a processor to compute
- a solar irradiance distribution over a surface of the entity captured in the electronic image of the entity that receives the solar radiation based at least in part upon the first plurality of values and the second plurality of values;
- wherein the solar irradiance distribution over the surface of the entity comprises a plurality of computed irradiance values that correspond to the second plurality of pixels, and further comprising utilizing the following algorithm to compute the plurality of irradiance values:
- E
- R
- ,
- i
- =
- V
- CCD
- ,
- i
-
- E
- DNI
- ρ
- R
- ,
- i
-
- tan
- 2
-
- (
- γ
- 2
- )
-
- π
-
-
- r
- sun
-
- _
-
- pixel
-
- s
- 2
- ∑
- sun
-
-
- V
- CCD
-
- _
-
- sun
- ,
- i
- ,
- where ER,i is an irradiance value for the surface of the entity that corresponds to pixel i in the electronic image of the entity, VCCD,i is a value of pixel i in the electronic image of the entity, EDNI is the direct normal irradiance at a time that the electronic image of the Sun was captured, rsun—pixels is a number of pixels in the radius of the Sun captured in the electronic image of the Sun, ρR,i is a measurement of reflectivity at a location on the surface that corresponds to pixel i in the electronic image of the entity, γ is the angle subtended by the Sun, and VCCD—sun,i is a value of pixel i in the electronic image of the Sun.
54 more elements
Dependencies are inferred from the claim text.