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Low-Cost, Highly Transparent, Flexible, Low-Emission Coating Film to Enable Electrochromic Windows with Increased Energy Savings

ITN Energy Systems is using low-cost, high volume roll-to-roll coating techniques to develop a new low-e film with high visible transmission and high infrared reflectivity. These images show ITN’s low-e film effectively blocks the flow of the infrared heat and maintains visible transmission almost as high a bare polyester film or glass surface. The product may be used with new and existing windows. Credit: ITN Energy Systems

ITN's roll-to-roll coater.
Credit: ITN Energy Systems

ITN's roll-to-roll coater. Credit: ITN Energy Systems

ITN's window film retrofit.
Credit: ITN Energy Systems

ITN's window film retrofit. Credit: ITN Energy Systems

ITN's transparent low-e film.
Credit: ITN Energy Systems

ITN's transparent low-e film. Credit: ITN Energy Systems

ITN's roll-to-roll coater.
Credit: ITN Energy Systems
ITN's window film retrofit.
Credit: ITN Energy Systems
ITN's transparent low-e film.
Credit: ITN Energy Systems

Lead Performer: ITN Energy Systems - Littleton, CO
Partners:
-- Electric Power Research Institute - Palo Alto, CA
-- Colorado School of Mines - Golden, CO
-- Stanford Linear Accelerator - Menlo Park, CA
-- Lawrence Berkeley National Laboratory - Berkeley, CA
DOE Funding: $749,679
Cost Share: $220,986
Project Term: 10/1/2013 - 9/30/2014
Funding Opportunity Announcement: Building Technologies Innovations Program 2013 (DE-FOA-0000823)

Project Objective

ITN Energy Systems is developing an integrated low-e/electrochromic (EC) window film to be applied in existing windows. While field testing of state-of-the-art EC windows shows that energy savings are maximized if a low-e coating is used in conjunction with the EC, available low-e films have a low visible transmission (~70% or less) that limits the achievable clear state and, therefore, the appearance and energy savings potential. This project will develop a novel low-e film that is optimized for compatibility with EC windows but that can also be used independently. Successful completion of the effort will produce a prototype integrated low-e, dynamic window film with an increased energy savings potential over state-of-the-art EC windows.

Project Impact

ITN Energy Systems estimates that 5 quads of energy are lost annually through windows -- depending on market adoption rates, this project could result in approximately 2 quads of energy savings annually.

Contacts

DOE Technology Manager: Bahman Habibzadeh
Performer: Brian Berland, ITN Energy Systems

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