Window Technology Optimizes Daylighting and Reduces Solar Heat Gain

In 2010, lighting space heating and cooling accounted for 56% of the energy use in commercial and residential buildings. The amount of energy consumed primarily depends on a building's insulative properties, which include the windows. Furthermore, the optical properties of windows (light transmission) dictate the amount of energy needed for lighting. For a number of years there has been a potential market for variable tint, energy control windows with acceptable cost, performance, and durability characteristics. Research has focused on developing window technologies that reduce or enhance the effects of solar heat gain, prevent sunlight glare, and are compatible with daylighting schemes.

Pleotint, LLC, has developed and commercialized a high-performance window with dynamic sunlight control, high insulation value, and low solar heat gain. The window is called Suntuitive- sunlight-responsive thermochromic (SRT) window system. Pleotint developed the sunlight responsive thermochromic technology and tested the technology’s performance and viability with assistance from DOE's Inventions and Innovation Program. The product is marketed in North America through an alliance with PPG Industries. Pleotint's SRT window is dynamic because it reversibly changes light transmission throughout the day based on the heat provided by the sun. This feature allows the windows to optimize the incoming brightness and heat load in both residences and commercial buildings. Every day of the year, every time of the day, and on every orientation on a building, the windows tint simply based on the intensity of direct sun without using wires, power supplies, or controls. The interlayer is made of the most common safety glass lamination polymer, polyvinyl butyral, which can be produced in rolls and shipped to window fabricators throughout the world, allowing dynamic windows to be produced almost anywhere safety glass laminates are made.

Pleotint currently holds nine U.S. patents for thermochromic windows and electrochromic materials. The first commercial sale for a large commercial building installation took place 2011 and further confirmed the comfort and heat control benefits in this building as well as at other retrofit sites where Pleotint's technology was used.


<h4>Overview</h4><ul><li>Developed and commercialized by <a href="">Pleotint, LLC</a>, through a marketing alliance with PPG Industries.</li><li>Commercialized in 2011.</li><li>Multiple installations throughout United States.</li></ul><h4>Applications</h4><p>Can be used to control daylighting and reduce energy consumption.</p><h4>Capabilities</h4><ul><li>Optimizes daylighting and provides visible light transmission between 50% and 10%.</li><li>Achieves solar heat gain coefficient as low as 0.11.</li><li>Provides dynamic window tinting without wires, power supplies, or controls.</li></ul><h4>Benefits</h4><h5>Comfort and Convenience</h5><p>Provides sound reduction and impact resistance, decreases glare, and minimizes fading from solar ultraviolet radiation without compromising visibility.</p><h5>Energy Savings</h5><p>Achieves 17% &ndash; 30% building heating and cooling energy savings depending on climate.</p><h5>Installation</h5><p>Installs like any conventional glazing without special requirements.</p><h5>Manufacturability</h5><p>Provides a thermochromic interlayer that can be supplied to laminators and window manufacturers worldwide.</p><h4>Contact Information</h4><p>Curtis Liposcak<br />(608) 216-5373<br /><a href=""></a><br /><a href="">Pleotint, LLC</a></p>