Broadband reflectors, concentrated solar power systems, and methods of using the same

A power generation system, reflective technology, applied in the field of concentrating solar power generation systems, to achieve the effects of low weight, improved power collection capability, and low cost

Inactive Publication Date: 2012-01-25
3M INNOVATIVE PROPERTIES CO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Power towers are not as advanced as trough systems, but offer higher solar conc...

Method used

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  • Broadband reflectors, concentrated solar power systems, and methods of using the same
  • Broadband reflectors, concentrated solar power systems, and methods of using the same
  • Broadband reflectors, concentrated solar power systems, and methods of using the same

Examples

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example 1

[0127] A UV reflective multilayer optical film was prepared utilizing a first optical layer made of polyethylene terephthalate (PE) obtained from Eastman Chemical (Kingsport, TN) as EASTAPAK 7452 and a second optical layer. PET1) produced from a copolymer of 75% by weight methyl methacrylate and 25% by weight ethyl acrylate (available as PERSPEX CP63 from Ineos Acrylics, Inc. (Memphis, Tenn.)) ( coPMMA1) produced. PET1 and CoPMMA1 were coextruded through a multilayer polymer melt manifold to form a stack of 223 optical layers. The layer thickness profile (layer thickness value) of this UV reflector is tuned to be approximately linear, where the first (thinnest) optical layer is tuned to have an approximately 1 / 4 wavelength optical thickness (refractive index) for 340 nanometer (nm) light. times the physical thickness) and progress toward the thickest layer adjusted to have an optical thickness of about 1 / 4 wavelength thick for 420 nm light. The layer thickness distribution o...

example 2

[0131] A UV reflective multilayer optical film was prepared using a first optical layer produced from PET1 and a second optical layer produced from CoPMMA1. PET1 and CoPMMA1 were coextruded through a multilayer polymer melt manifold to form 223 optical layers. The layer thickness profile (layer thickness values) of this UV reflector is tuned to be approximately linear, with the first (thinnest) optical layer tuned to have about 1 / 4 wavelength optical thickness (refractive index times physical thickness) for 340nm light And progress towards the thickest layer, which is tuned to have an optical thickness about 1 / 4 wavelength thick for 420 nm light. The layer thickness distribution of such films can be tuned to provide improved spectral properties using the shaft rod apparatus taught in US Patent No. 6,783,349 (Neavin et al.) in conjunction with layer distribution information obtained using microscopy techniques.

[0132] In addition to these optical layers, non-optical protecti...

example 3

[0138] A UV reflective multilayer optical film was prepared using a first optical layer produced from PET1 and a second optical layer produced from CoPMMA1. PET1 and CoPMMA1 were coextruded through a multilayer polymer melt manifold to form 223 optical layers. The layer thickness profile (layer thickness values) of this UV reflector is tuned to be approximately linear, with the first (thinnest) optical layer tuned to have about 1 / 4 wavelength optical thickness (refractive index times physical thickness) for 340nm light And progress towards the thickest layer, which is tuned to have an optical thickness about 1 / 4 wavelength thick for 420 nm light. The layer thickness distribution of such films can be tuned to provide improved spectral properties using the shaft-and-rod device taught in US Patent No. 6,783,349 (Neavin et al.) by combining layer distribution information obtained with microscopy techniques.

[0139] In addition to these optical layers, non-optical protective skin...

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PUM

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Abstract

Broadband reflectors include a UV-reflective multilayer optical film and a VIS/IR-reflective layer. In various embodiments, the VIS/IR reflective layer may be a reflective metal layer or a multilayer optical film. Concentrated solar power systems and methods of harnessing solar energy using the broadband reflectors and optionally comprising a celestial tracking mechanism are also disclosed.

Description

[0001] Cross References to Related Applications [0002] This patent application claims the benefit of U.S. Provisional Patent Application No. 61 / 141,338, filed December 30, 2008, and U.S. Provisional Patent Application No. 61 / 178,123, filed May 14, 2009, and incorporates the disclosures of the aforementioned provisional patent applications Incorporated herein by reference in its entirety. technical field [0003] The present invention relates to reflectors suitable for reflecting a wide range of electromagnetic radiation, concentrating solar power systems comprising said reflectors and methods of using them. Background technique [0004] Concentrated solar power (CSP, also known as "concentrated solar power") technology uses sunlight directed toward a heat transfer fluid that heats up and whose thermal energy is then transferred (eg, for heating) or converted into Electrical energy (eg, through the use of turbine generators). Conventional CSP reflectors are made of silve...

Claims

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Application Information

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IPC IPC(8): F24J2/10G02B5/08H01L31/052B32B7/023F24S10/70F24S20/20F24S23/00F24S23/70F24S23/74F24S23/77F24S50/20
CPCH01L31/0522Y02E10/52F24J2/541Y02E10/45F24J2002/1076H01L31/0422F24J2/14Y02E10/41Y02E10/46F24J2/16Y02E10/47F24J2/1057F24J2/07F24J2002/5486F24J2002/5468H02S20/00H01L31/0547F24S2025/601F24S23/00G02B5/0841F03G6/06Y10T428/31757Y10T428/31928Y10T428/24942Y10T428/31913Y10T428/3154Y10T428/31909Y10T428/31786Y10T428/31692Y10T428/3175Y10T428/31681F24S20/20F24S23/82F24S23/74F24S23/77F24S10/70F24S50/20F24S30/425F24S2023/87F24S2030/136F24S2030/16F24S20/00Y02E10/44B32B7/023B32B2331/00B32B7/12B32B2255/205B32B15/088B32B27/34B32B2250/42B32B2551/00B32B2377/00B32B2551/08B32B15/20B32B15/082B32B27/308B32B2327/00B32B15/08B32B27/302B32B2333/12B32B15/18B32B2311/12B32B2367/00B32B27/325B32B15/09B32B2311/24B32B2383/00B32B2255/10B32B2307/416B32B2325/00B32B27/304B32B2323/00B32B2311/08B32B27/36B32B15/085B32B2311/30B32B27/306B32B27/283G02B19/0019G02B17/006G02B19/0042G02B6/0011F24S10/00F24S23/70Y02E10/40F03G6/061F03G6/063
Inventor 蒂莫西·J·赫布林克苏珊娜·C·克利尔劳伦斯·R·吉尔伯特迈克尔·F·韦伯余大华陈定远奥德丽·A·谢尔曼
Owner 3M INNOVATIVE PROPERTIES CO
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