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Heat Resistance and Emissivity by John Smith
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Heat Resistance and Emissivity |
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Business
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We started looking at low-E glass last week and actually found some pretty interesting side issues associate with the product. It turns out that because of the high reflectivity of the glass, there are actually rare incidences of neighboring houses and cars receiving damage from the intense glare coming off of some low-E windows made by some window manufacturers. Now, this is not an every day, or every window occurrence, but it is an fascinating issue that highlights the way these window work and the reality that as new technologies emerge, it is important that we always strive to understand the ripple effects they could have. If you’re looking for a ripping good time, go read up on the issue and see what you might learn. Now as interesting as that whole issue is, there are things that beckon us onward and upward in our march through the window terminology glossary we’ve been wading through for some time. If it were a swamp, we’d be knee deep, so let’s keep on wading and see if we ever find the other side. In light of our recent discussion on reflectivity, radiation, and glazing materials, we are going to look at another pretty important term in the discussion. R-value is the next term we’re going to explore, and it has a lot to do with emissivity and heat flow. R-value is a measure of the resistance of a particular glazing material or window assembly to heat flow. It is the opposite or inverse of U-factor and is expressed in this handy-dandy measure: hr-sq ft-°/Btu. Now, were going to leave that to the scientists to unpack, but the bottom line is that a high R-value window has a higher resistance to heat flow than a lower R-value window. Similarly, a high R-value window also has a higher insulating value than a window (aluminum window or vinyl window) with a lower R-value. Essentially, the higher the R-value, the more energy efficient the window. So put that in your blender of a brain, and let it spin for a few days and we’ll see what comes out. See yah next time. For more vinyl windows, aluminum windows and replacement windows visit us at http://www.croftllc.com/ Vinyl Windows
Aluminum Windows
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Aluminum Windows, Vinyl Windows,
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