Get immediate access to thousands of

 high quality papers and essays.
Mega Essays Home  |   Questions?  |   Acceptable Use  |   Customer Care  |   Site Search
    Enter Essay Topic:

   

    Subjects:
Acceptance Essays
Arts
Custom Papers
English
Foreign
History
Miscellaneous
Movies
Music
Novels
People
Politics
Religion
Science
Sports
Technology

    Login:
Member Login
Join Now!
Click here to Join Now!
by: Credit Card
Click here to Join Now!
by: Online Check
Click here to Join Now!
by: Phone 1-900

advances in glazing materials

Current Options In Widow’s Energy Efficiency 5

Understanding How Energy Moves Through Windows 5

Tomorrow’s Options for More Efficient Windows 8

1. How energy flows through windows: Radiation 6

2. How energy flows through windows: Convection ………………………………...…….6

3. How energy flows through windows: Conduction……………………………………….7

4. Three Routes to Switchable Windows. 10

Until recently, clear glass was the primary glazing material used in windows. Although

glass is durable and allows a high percentage of sunlight to enter buildings, it has very little

resistance to heat flow. During the past two decades, though, glazing technology has

Research and development into types of glazing have created a new generation of mat

. . .
How much does energy cost: in Califiornia for example where the rate for electricity per kilowatt-hour will be the most expensive in the nation, one can justify spending a lot more on energy efficient windows than if you live in Colorado where is cheap.

Visible Light Transmittance – A measure of the amount of that portion of the total solar radiation visible to the human eye.

Infrared Radiation – Invisible radiation that humans perceived as heat. Three Routes to Switchable Windows

Lawrence Berkley Laboratory’s Selkowitz thinks that electrochromics should be far easier to sell than low-e, or emissivity, windows, which already appear in more that 25 percent of the new commercial and residential windows. But the energy performance of hard-coat low-e films is slightly poorer than

that of soft-coat films.

Gray- and bronze-tinted windows reduce the penetration of both light and heat into

buildings in equal amounts (i. This first generation of superwindows now

available have a center-of-glass R-value of 8 or 9, but have an overall window R-value of

only about 4 or 5 because of edge and frame losses. The coatings typically face air spaces within windows and reduce heat flow-between

the panes of glass. (Wilson, 1993)

Spectrally Selective Coatings

Spectrally selective (optical) coatings are considered to be the next generation of low-e technologies. Your microclimate: One might live in a part of the country that is generally warm, but your house might be in a cold spot-for example, on the noth side of a hill where is it always windy. Soft-coat low-e films degrade when

exposed to air and moisture, are easily damaged, and have a limited shelf life, so they are

carefully applied by manufacturers in insulated multiple-pane windows. Heat- absorbing glass reflects only a small percentage of light and therefore does not have the mirror-like appearance of reflective glass. Glass absorbs radiant heat, or long wavelength infrared radiation, warming up in the process. (Wilson, 1993)

Tomorrow’s Options for More Efficient Windows

Superwindows

"Superwindows" now coming on the market can attain high thermal resistance by combining multiple low-e coatings; low-conductance gas fills; barriers between panes, which reduce convective circulation of the gas fill; and insulating frames and edge spacers.

Common topics in this essay:
Glazings Low-e, Superwindows Superwindows, Heat-Absorbing Glazings, Laboratorys Selkowitz, Coatings Spectrally, Switchable Windows, Reflective Coatings, According Krahn, Glazings Windows, Coat Low-e, spectrally selective, energy flows windows, energy flows, flows windows, spectrally selective coatings, selective coatings, low-e films, efficient windows, tinted glass, heat flow, heat transfer, visible light, resistance heat flow, flows windows radiation, reduce heat transfer,

See the rest of the paper. Join Now!

Approximate Word count = 1793
Approximate Pages = 7 (250 words per page double spaced)

Already a member? Click here

Click here to Join Now!
by: Credit Card
Click here to Join Now!
by: Online Check
Click here to Join Now!
by: Phone 1-900



CREDIT CARD
ONLINE CHECK
JOIN BY PHONE



Get immediate access to over 100,000
high quality term papers and essays!!!

Webmasters make $$$!



All papers are for research and references purposes only!
Copyright (c) 2001-2008 Mega Essays LLC
All rights reserved. DMCA NEW