Low – E Retrofit Films and Glazing Systems How does it work? How is this sustainable? Benefits Pitfalls Application/Suggestions at the University of Florida

For Hot Climates, Films or Coatings Are Placed On the Outside of the Glazing System How Does It Work?

Glazing surfaces absorb or reflect long wave infrared radiation

This cuts done on the amount of solar heat gain, But also on the amount of visible light that enters the building

How Is This Sustainable? “Low-e windows. According to the American Council for an Energy Efficient Economy, an $8 million low-e coating plant could produce a minimum of 40 million square feet of residential windows per year for the 10-year nominal life of the coating system. The resulting savings over ordinary double glazing during the first ten years of operation is equivalent to 36 million barrels of oil”. “Off-shore oil. Invest $300 million in an offshore oil platform, which is capable of producing an identical amount of oil over the 10-year nominal life of the oil field”.

What are the Benefits? -Increased insulation levels -No need for seals or special construction (easy installation) -Reduces overall heat gain of the building -Reduces energy consumption and operating costs -Blocks out harmful ultra-violet light

What are the disadvantages? -Films block out much of the solar spectrum making internal lighting difficult -Films absorb greater amounts of heat, which is then radiated inward -Window warranties often become void upon application because the excess heat can cause breakage -limited life span, particularly when applied to the outside of the window

Application at the University of Florida