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Smart Windows that Modulate Incoming Light and Heat for More Efficient Energy Usage

IP Title

Infrared-modulating Electroactive Devices with Visible Region Transparancy (All Other Except SWNT)

Detailed Technology Description

None

Application Date

Dec 19, 2013

Application No.

9,411,209

Others

*Abstract

Electrochromic Device Can Be Applied to Existing Windows or Manufactured into New Window Fixtures

These smart windows automatically adjust their absorbance of infrared (IR) light to manage temperatures inside buildings with minimal changes to visible natural light. Annually, about 4 percent of U.S. energy consumption results from window inefficiencies due partly to high transmission of solar radiation that causes undesired heat in buildings, thus increasing cooling costs. Historically, blinds or curtains have been used to reduce indoor solar heat or to insulate heat from escaping, but this simultaneously increases indoor lighting costs and lowers worker productivity, which is otherwise increased by aesthetically pleasing views and the presence of natural light. Likewise, available electrochromic windows control incoming light and heat by darkening or becoming opaque. No available system can affect incoming solar radiation without also darkening the space. All electrochromic windows, in addition, require the removal of current windows and installation of new, a costly and laborious process. Researchers at the University of Florida, however, have developed smart windows that can modulate incoming IR radiation without affecting incoming visible light, therefore maximizing worker productivity and minimizing heat gains inside the building. The embodiments of this discovery include both means of applying active electrochromic laminate to existing windows as well as incorporating the mechanism into the manufacture of new windows. The window will modulate infrared light with minimal change in visible light, allowing for savings on heating, cooling, and lighting costs.

Application

Dynamic smart windows that minimize energy costs while optimizing natural light

Advantages

• Minimizes incoming IR radiation without significantly impacting visible natural light, lowering cooling costs during warm months
• Automatically attenuates absorbance to appropriate levels, potentially lowering heating costs during cool months
• Optimizes natural light and aesthetics, increasing worker productivity and sense of well-being
• Uses alternate electrode materials, including transmissive carbon nanotube films, increasing the conductivity and flexibility of the electrochromic window

Technology

These photochromic windows control infrared transmissions with little change of visible light transmission through the cell by including a minimally color changing polymer (MCCP) and a non-color changing polymer (NCCP) at the electrode contacts. The active MCCP and NCCP electrochromic cell used in these smart windows is flexible, robust, and highly transparent, and remains highly transparent even in the IR region. "Sticky" electroactive polymers, when applied to windows, can promote stabilization and attachment to the electrode contacts, thus enhancing the electrical conductivity of the windows as well. As an aesthetically pleasing active electrochromic laminate, it has the potential to transform existing glass windows into smart windows. New windows could include these electrochemical cells to protect against IR without affecting visible light.

*IP Issue Date

Aug 9, 2016

*IP Publication Date

May 21, 2015

*Principal Investigator

Name: John Reynolds

Department:

Name: Aubrey Dyer

Department:

Country/Region

USA