Posted by wit windows on Friday, September 2, 2011
Under: R-5
What is an R-5 Window?
R-5 windows
are highly insulating windows with a whole-window R-value of 5 (or a
U-factor of around 0.2) and are the top tier of energy-efficient windows
for cold and mixed climates available today.
What is an R-value and U-factor?
An
R-value indicates an insulation's resistance to heat flow. So, the
higher the R-value, the greater the insulating effectiveness. U-factor
is the inverse of R-value. So, the lower the U-factor, the better the
thermal performance of the insulation..
Research indicates that R-5 windows can reduce the average heat loss through windows by as much as 40 percent.
Qualifications
In accordance with October 27, 2009 draft specification
requirements provided by the U.S. DOE, to be considered for the R-5
Volume Purchase Program, all units must achieve a maximum 0.22 U-value for operable units and 0.20 U-factor for fixed, which will likely mandate triple-glazed insulating glass. Additionally, they must be certified to ASTM E2190 for insulating glass durability, NFRC 100/200 for U-factor/Solar Heat Gain and AAMA/WDMA/CSA 101/IS2/A440-05 for air, water and structural performance. All windows must be offered at a fixed price and provide a 20-year warranty on the glass.
The U.S. Department of Energy (DOE) Building Technologies Program launched the R-5 Windows Volume Purchase Program that gives manufacturers an opportunity to be listed as preferred vendors.
In : R-5
Tags:
u.s. department of energy r-5 volume purchase program
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r-5
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