Bonus Problem - Lester Dabu and Lyndon Smith MEM 345 Dr Cho...

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Lester Dabu and Lyndon Smith MEM 345 Dr. Cho June 1, 2017 The emissivity of a window refers to its tendency to radiate absorbed heat, which is one of the three methods by which heat is transferred. When solar energy or sunlight, hits an non- coated window, a large percentage of the energy can be transmitted through the glass and a very little amount is reflected and absorbed as shown in figure 1. Conversely, installing a film on the glass can dramatically change how it reflects, transmits and absorbs solar energy. The level of absorption and reflectance is dependent on how the film is constructed. In this report we propose using a material called Aerogel is a synthetic porous ultralight material derived from a gel . Using the Aerogel as a film in Low-Emissivity double glazed application will have the desired effect as our calculations will show. Figure 1. Large Percentage of energy transmited throuh non-coated glass The thermal conductivity(k) of glass is given as 0.9 W/m . k, the temperature of the sun T sun

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