Abstract
A thermal evaluation of a four configurations of double glass window (DGW) coupling to a room is presented. The DGW consists of two vertical semitransparent walls separated by a 12mm air gap. The effect of varying the ambient temperature and the incident solar radiation in the warm climate conditions in México is analyzed. Numerical simulations were conducted for four configurations; Case 1: clear glass+air gap+clear glass (Reference); Case 2: clear glass+air gap+absorbent glass; Case 3: clear glass+air gap+Low-e glass; and Case 4: clear glass+air gap+reflective glass. Optical transmittance and specular reflectance were measured individually and in one sample piece for each case. The results showed that Case 4 reduces the heat flux to the indoors by up to 73%, with respect to Case 1. Moreover, Cases 2 and 3 had a similar behavior, obtaining a reduction of indoor heat flow close to 33.5% with respect to Case 1. Case 4 is the best option for energy savings in a warm climate, where it is possible to save up to $20.29 USD per kWh per year, in comparison to Case 1. In addition, the payback period for Case 4 is 3.7years. Therefore, the use of reflective double pane window is highly recommended in Mexican warm climates.
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