Research Project Information

Research Project Summary Information

An Intelligent Window Product - A Feasibility Study (ST10612-1)

United Environment and Energy LLC


Sunlight contains visible light and infrared light. The infrared light causes heating, and regular glass in residential and commercial building windows allows both visible and infrared light to pass through the glass. In hot weather, such as summer in New York State, this radiation from the infrared light significantly increases the temperature in the room. This effect leads to high air conditioning costs. Tinting the glass can block some of this infrared light, but also blocks a portion of the visible light and reduces the benefits from natural light.

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Project Description

An advanced process using aerosol gel coating technique will allow for large scale production of building window glass that has capability to both transmit and reflect infrared energy through the window glass, activated by a temperature trigger point. A small scale reaction will be tested and optimized into a coating process using 10cm x 5cm glass substrates. A full realm of tests, including scratch, adhesion, and durability will be administered to the window coating to check its ability to hold up under all conditions. This developed aerosol gel technique will be compared to more conventional sol gel technique results that will also be obtained during this project.


•Proposer is a New York State company, and will be developing the product in NY •Reduced summertime air conditioning loads, both demand (kW) and energy (kWH) •Attract capital investment in the technology

Project Results

A semi-automatic APCVD coating system was successfully engineered, built, and put into operation. A wet chemistry coating system was also established. Pure thermochromic materials normally have well defined phase transition temperatures. Nevertheless, when the thermochromic materials were applied to glass surfaces as a thin membrane, Contractor found that phase transition temperature was not a specific number but a temperature range. The transmittance of IR decreased and the reflectance of the IR increased from the temperatures of 80 to 98 deg F, respectively. There will be greater potential for energy benefit at higher temperatures when more IR is reflected, than relatively lower temperatures. The optimal operating conditions were determined, and glass coatings with different membrane thicknesses were prepared. The coated glass was evaluated at Cornell University, UEE, and Guardian Industries R&D Center. Two prototype windows with the intelligent coating glass were fabricated, and field tested on a building. Spectrometer measurements of the intelligent coated glass reveal blockage of 90% UV light, and was not affected by warmer ambient temperatures. A standard glass coating procedure was developed, and the economics of implementing an intelligent glass coating procedure to a standard float glass manufacturing process would increase the cost by just $0.041/sq ft (3.4%), based on a $1.20/sq ft cost of float glass.


United Environment and Energy LLC
111 Ridge Rd
Horseheads, NY 14845

Principle Investigator

Ben Wen

Universities Involved


Project Type:

Product Development

Technologies Types:

Building Systems

NYSERDA Contact Information

Gregory Pedrick


R&D -Transport & Power Systems

Contract Details

Start Date: 1/11/2010
Project Status: Active
Contract Number: ST10612-1

Last Updated: 6/25/2014