Influence of environmental conditions on the determination of the solar heat gain coefficient of glazing
DOI:
https://doi.org/10.46421/entac.v20i1.6223Keywords:
Solar heat gain coefficient, Glasses, Environmental conditionsAbstract
The solar heat gain coefficient (SHGC) of glasses can be determined using mathematical models, computer simulations, or field and laboratory measurements. Standardized procedures establish specific environmental conditions, such as internal and external temperature, solar radiation intensity, and convection coefficients, since these parameters influence the SHGC. However, when environmental variables do not comply with standards, doubts may arise regarding the accuracy of the results. The objective of this article is to analyze the influence of outdoor temperature, indoor temperature, and solar radiation intensity on the determination of the SHGC. The evaluation of the SHGC was performed using the WINDOW software, maintaining a constant standard simulation configuration in each simulation, except for the environmental condition analyzed, which varied within a predetermined range. Three 4 mm thick glasses were evaluated: one clear and two solar control glasses. The clear glass showed greater stability in response to environmental variations, with minimal changes in the SHGC. The solar control glasses were more sensitive to changes, exhibiting a maximum SHGC variation of up to 9.84%. All three glasses showed a decrease in SHGC as internal temperature increased. Furthermore, solar radiation intensity had a limited impact on the SHGC, with maximum variations of up to 2.5% in the solar control glasses and little change in the clear glass.
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