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Solar concentrating mirror

A technology of solar concentrating and reflecting mirrors, which is applied in the directions of solar thermal energy, solar collectors, and solar ray concentration, and can solve problems such as failure of solar concentrating mirrors and decline in concentrating efficiency

Inactive Publication Date: 2011-06-08
3M INNOVATIVE PROPERTIES CO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Deterioration of these materials will result in reduced concentrating efficiency and potentially complete failure of the solar concentrating mirror

Method used

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  • Solar concentrating mirror
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Examples

Experimental program
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Effect test

example 1

[0090] Using the same PEN and PMMA materials as in Comparative Example 1, a multilayer optical film was prepared with a birefringent layer made of PEN and a second polymer layer made of PMMA. PEN and PMMA were coextruded through a multilayer polymer melt manifold to produce a multilayer melt stream with 275 alternating birefringent and second polymer layers. In addition, a pair of non-optical layers, also composed of PEN, were coextruded as protective skin layers on either side of the optical layer stack. The multilayer coextruded melt stream was cast onto chilled rolls at 22 meters per minute, resulting in a multilayer cast web approximately 725 microns (29 mils) thick. The multilayer cast web was then heated in a tenter oven at 145°C for 10 seconds and then biaxially oriented to a draw ratio of 3.8 x 3.8. The oriented multilayer film was further heated to 225°C for 10 seconds to increase the crystallinity of the PEN layer. The reflectance of the multilayer visible mirror f...

example 2

[0092] Multilayer mirrors can be prepared with a birefringent layer made of PEN and a second polymer layer made of polyoxamide silicone (SPOX) from 3M Company, St. Pau, MN. PEN and SPOX layers were coextruded through a multilayer polymer melt manifold to produce a multilayer melt stream with 550 alternating first and second optical layers. In addition to the birefringent layer and the second polymer layer, a pair of non-optical layers also composed of PEN can be coextruded as protective skin layers on either side of the optical layer stack. The multilayer coextruded melt stream can be cast onto chilled rolls at 22 meters per minute, resulting in a multilayer cast web approximately 1400 microns (55 mils) thick. The multilayer cast web can then be heated in a tenter oven at 145°C for 10 seconds and then biaxially oriented to a draw ratio of 3.8 x 3.8. The oriented multilayer film can be further heated to 225°C for 10 seconds to increase the crystallinity of the PEN layer. The ...

example 3

[0094]Multilayer mirrors can be prepared with a birefringent layer made of PET and a second polymer layer made of SPOX (both from 3M Company). PEN and SPOX can be coextruded through a multilayer polymer melt manifold to produce a multilayer melt stream with 550 alternating birefringent and second polymer layers. Additionally, a pair of non-optical layers also composed of PEN can be coextruded as protective skin layers on either side of the optical layer stack. The multilayer coextruded melt stream can be cast onto chilled rolls at 22 meters per minute, resulting in a multilayer cast web approximately 1400 microns (55 mils) thick. The multilayer cast web can then be heated in a tenter oven at 95°C for 10 seconds and then biaxially oriented to a draw ratio of 3.8 x 3.8. The oriented multilayer film can be further heated to 225°C for 10 seconds to increase the crystallinity of the PEN layer. The reflectance of this multilayer visible mirror film can be measured with a LAMBDA 95...

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PUM

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Abstract

An article that is suitable for use as a solar concentrating mirror for enhancing the use of solar collection devices, such as solar cells. The article includes a multilayer optical film and a compliant UV protective layer. The article addresses degradation issues in solar concentration devices, provides specific bandwidths of electromagnetic energy to the solar cell while eliminating or reducing undesirable bandwidths of electromagnetic energy that may degrade or adversely affect the solar cell, and renders a compliant sheet of material that may be readily formed into a multitude of shapes or constructions for end use applications. A solar collection device comprising the article and optionally comprising a celestial tracking mechanism is also disclosed.

Description

technical field [0001] The present invention relates to wavelength selective mirrors suitable for use as solar concentrators to improve the efficiency and operation of solar cells. Background technique [0002] Conventional solar concentrating mirrors are typically used to direct a wide bandwidth of solar energy onto solar cells or solar thermal conversion elements. However, certain wavelengths of electromagnetic radiation reflected from the solar concentrating mirrors onto the solar elements can adversely affect the solar elements. For example, wavelengths in the infrared spectrum can undesirably increase the temperature of some solar cells. As such, solar cells lose efficiency and degrade over time from excessive heat exposure. Long-term exposure to ultraviolet (UV) light also often leads to premature degradation of components of solar cells. [0003] Materials employed in the construction of solar concentrating mirrors may include compositions that are adversely affect...

Claims

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Application Information

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IPC IPC(8): F24J2/10H01L31/052G02B5/08F24S23/70F24S23/71
CPCF24J2002/1071F24J2/1057Y02E10/52G02B5/3083F24J2/16G02B5/0841G02B1/105F24J2/14H01L31/0522H01L31/0547F24S23/74F24S2023/86F24S23/82F24S23/77G02B1/14
Inventor 蒂莫西·J·赫布林克特蕾西·L·安德森苏珊娜·C·克利尔安德鲁·K·哈策尔史蒂芬·A·约翰逊爱德华·J·奇威尔迈克尔·F·韦伯余大华
Owner 3M INNOVATIVE PROPERTIES CO
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