Avoiding Overheating

Avoiding Overheating

As much as 40 percent of the cooling requirements of a glass enclosed structure is a function of heat entering through the glass. Stopping heat at the glass is the most effective means of lowering temperatures, reducing cooling operating costs and increasing plant growth. In new construction, reducing heat at the window can mean the need for smaller and less expensive HVAC systems.

You can block heat using expensive computer or manually operated shades or by applying colored coatings to glass. Shades are prone to operational problems and use energy. Colored coatings need to be removed to maximize light transmission after the hottest time of the year.

For existing glass greenhouses, another option is to install clear, colorless window film that will block unwanted heat while allowing in desirable natural light. Once installed, such film may last up to 20 years. It does not need to be removed, does not change the appearance or visual clarity of the glass, does not need special care and will not fail to perform because of computer or mechanical malfunction. Affix it and forget it.

Spectrally Selective Versus Conventional Window Film

Tinted window films do reduce heat into greenhouses, but they can also reduce a significant percentage of visible light through the glass, according to V-Kool President & CEO Marty Watts.

“Most conventional window films transmit less than 34 percent of visible light, a good 36 percent less than the 70 percent necessary to be undetected by the naked eye,” he says. “The result is building interiors are correspondingly darkened, often requiring the use of illumination. This may lead to higher electricity consumption that may increase inside temperatures, requiring more air conditioning.”

Clear, spectrally selective films like V-Kool solve the light-blocking problem. These films select desirable daylight while blocking out undesirable heat. These types of films transmit 70 percent of the visible light, but block the same amount of heat compared to the darkest conventional films.

The Kool Option

V-Kool 70 clear applied window film reduces solar heat and ultraviolet radiation without significantly reducing visible light or changing the appearance of existing glass. V-Kool clear applied film blocks unwanted heat better than many tinted or mirrored films.

It is installed by professionals at a per-square-foot cost of between $9 and $12 depending on the size and difficulty of the job. V-Kool is reducing the use of air conditioning and energy in thousands of homes and in such landmark buildings as the former headquarters of Montgomery Ward in Chicago, the American Institute of Architects building in Washington and on the campus of Stanford University.

V-Kool Inc., based in Houston, is a sales and marketing distribution company of spectrally selective applied films for architectural, automotive and specialized vehicular applications. For information, visit V-Kool on the Web at www.v-kool-usa.com.

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