Q thru Double pane

Q thru Double pane - A Study of Double Pane Windows and...

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A Study of Double Pane Windows and Heat Flux Allen Liu University of California, San Diego Jacobs School of Engineering Department of Mechanical and Aerospace Engineering MAE221A December 7 th , 2007 Abstract: Double-pane windows act as the most frequent form of heat flux reduction among home owners. Their functionality, importance, and cost effectiveness will be discussed throughout this paper. A history of the development of window technology will be reviewed and a simplified example double-pane window will be studied. Although the installation of double-pane windows is an affective way to reduce the amount of heat lost or gained during extreme weather conditions, it is a long term investment that requires many years of use before the initial cost is regained.
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I. Introduction: All houses, apartments, and town houses big or small have windows. They are necessary to let in natural light from the sun as well as fresh air into a building. But did you know windows are the leading cause of heat loss during cold winters and heat gain during the summer? We all need windows in our homes, but with so many windows to choose from, which window is the best kind? Most home owners look for affordable windows that are esthetically attractive, let in plenty of light, and most importantly, home owners look for windows that will be energy-efficient. But with an expensive initial installation cost, it is important to choose the right window. With modern window technology gradually evolving over the past century, today’s new trend of window installation is the double-pane window. A typical window, in terms of heat flux, is practically equivalent to a hole in a wall. While a hole in the wall would allow cold or hot air to flow into a building, glass (1.1 W/m k) windows make up for the unwanted circulation with a thermal conductivity over 40 times greater than air (.025 W/m k) 1 . Manufacturers boast that double-pane windows have an improved R coefficient, reducing the heat flux lost or gained by a window. As a result, energy costs can be reduced by 15-30%. In addition to improving thermal insulation, double pane windows increase the resale value of a home and reduce noise from the outside environment. 2 Improvements in energy efficiency as well as an increased resale value of a home make double pane windows a beneficial investment in long term home ownership. Figure 1: A perpendicular cross section of a double pane window.
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II. Importance: Due to the increase cost of energy, the global market is becoming increasingly concerned with energy conservation. With the global temperature increasing one degree centigrade over the past century, reducing global warming is another reason to improve methods of energy conservation. Many countries have taken means to construct energy efficient buildings in residential and commercial sectors. The German government, for example, requires that double pane windows must be used and forbids the use of single pane windows. In North America, as
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This note was uploaded on 09/24/2010 for the course MMAE 592 taught by Professor Alexanderostrogorsky during the Spring '10 term at Illinois Tech.

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Q thru Double pane - A Study of Double Pane Windows and...

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