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Light redirecting film useful with solar modules

A technology of light redirection and solar photovoltaics, which is applied in the directions of solar thermal energy, solar collectors, solar heating systems, etc., and can solve problems such as reflected light escape

Inactive Publication Date: 2019-08-27
3M INNOVATIVE PROPERTIES CO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in cases where the photovoltaic module installation relative to the sun position creates asymmetric conditions (e.g., non-tracking photovoltaic module installations, longitudinal vs. Some reflected light escapes from the PV module

Method used

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  • Light redirecting film useful with solar modules
  • Light redirecting film useful with solar modules
  • Light redirecting film useful with solar modules

Examples

Experimental program
Comparison scheme
Effect test

example 1

[0097] Master tools were produced by the flying shear system and method described in US Patent No. 8,443,704 (Burke et al.) and US Application Publication No. 2009 / 0038450 (Campbell et al.). Using this method, a groove with a 45-degree offset angle and a 120-degree crown angle is cut in the base tool.

[0098] Using the base tool described in US Patent No. 6758992 (Solomon et al.), by making a polymerizable resin (e.g. , UV-curable acrylate resin) to produce microstructured films. While the base tool is in contact with the polymer film, ultraviolet radiation is used to cure the resin into the shape provided by the structure of the base tool. The off-angle of the basic tool design used to make these prisms caused the prisms to have an off-angle of 45° relative to the web axis of the PET film.

[0099] A reflective coating was applied to the microscopic prisms in a manner similar to that described in U.S. Patent No. 4,307,150 (Roche et al.). The opaque mirror metal surface is...

example 2

[0101] The base tool was created using the flying shear system and method described in Example 1. A groove with a -82° offset angle and a 120° apex angle was cut in the base tool.

[0102] Microreplicated membranes were fabricated as described in Example 1. This microreplicated film had prisms with an off-angle of -82° relative to the web direction of the film.

[0103] A reflective coating was applied to the microscopic prisms as described in Example 1. An opaque mirror-like metal surface is vapor-coated onto microscopic prisms to a thickness of approximately 80nm using high-purity (99.88+%) aluminum.

[0104] result

[0105] Light redirecting film articles were analyzed using an Eldim EZContrast L80 instrument with parallel beam reflection option (Eldim S.A., Hérouville-Saint-Clair, France). The instrument illuminates the sample with a narrow-angle source while collecting reflected light in order to analyze its angular distribution. 3M Solar Light Redirecting Film (LRF)...

example 3

[0110] Example 3: Tracking System Modeling

[0111] Where photovoltaic module 300 is part of a one-dimensional tracking photovoltaic module installation, photovoltaic module 300 will track the movement of the sun. The axis of the tracking system is usually aligned in the north-south direction, and the rotation occurs in the morning from east to afternoon in the afternoon, as shown in Figure 19. The panels are usually arranged on these trackers in a landscape orientation (such that when parallel to the ground, the long dimension of the photovoltaic modules is aligned east-west, with the Figure 19A marked as "L"). This orientation allows the collection area ratio to be arranged in an orthogonal (vertical) orientation (in Figure 19B The panels marked "P") are larger. The results of ray tracing modeling for various declination angles presented in Table 2 indicate that the 50° polarizing light redirecting film article provides the highest annual energy improvement for 30° nort...

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Abstract

The invention discloses a light redirecting film useful with solar modules. The light redirecting film defines a longitudinal axis, and including a base layer, an ordered arrangement of a plurality ofmicrostructures, and a reflective layer. The microstructures project from the base layer, and each extends across the base layer to define a corresponding primary axis. The primary axis of at least one of the microstructures is oblique with respect to the longitudinal axis. The reflective layer is disposed over the microstructures opposite the base layer. When employed, for example, to cover portions of a PV module tabbing ribbon, or areas free of PV cells, the films of the present disclosure uniquely reflect incident light.

Description

[0001] This application is a divisional application of a patent application (application date: October 12, 2016, application number 201610892657.2, title of the invention is "light redirecting film for solar modules"). technical field [0002] The present disclosure relates to reflective microstructured films, and their use in solar modules. Background technique [0003] Renewable energy is energy derived from renewable natural resources such as sunlight, wind, rain, tides and geothermal heat. As technology advances and the global population grows, the demand for renewable energy has increased dramatically. Today, although fossil fuels provide the vast majority of energy consumption, these fuels are non-renewable. The global dependence on these fossil fuels brings not only concerns about their depletion, but also environmental concerns associated with the emissions resulting from burning these fuels. Because of these problems, countries around the world have been advocatin...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01L31/054H01L31/0236H01L31/048H01L31/05G02B5/04G02B19/00F24S23/00
CPCH01L31/048H01L31/02366H01L31/0488H01L31/0508H01L31/0512H01L31/0547G02B19/0019G02B19/0042G02B5/045Y02E10/52
Inventor M·B·奥尼尔马家颖
Owner 3M INNOVATIVE PROPERTIES CO
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