Determinação do fator solar de vidros por meio de medições laboratoriais, simulações computacionais e cálculos normatizados
DOI:
https://doi.org/10.46421/encac.v17i1.4161Keywords:
Solar Heat Gain Coefficient, Laboratory measurements, Computational simulationAbstract
Solar Heat Gain Coefficient (SHGC) is a thermal property of glass and transparent elements, defined as the ratio between the amount of solar energy that passes through the glass by the amount of solar energy that reaches it. SHGC can be determined by means of mathematical models, computer simulations, or field and laboratory measurements. This paper compares the SHGC obtained by means of laboratory measurements, using the PoWEM equipment, with values determined by using the WINDOW software and calculated according to ISO 9050 standard. Two solar control glasses and one clear glass, used as a reference, were selected. The SHGCs obtained by means of laboratory measurements were lower than the other methods due to solar simulator and equipment's limitations. Despite it, there was a good approximation of the behavior of the glasses regarding the increase in air velocity. The heat transfer coefficient on exterior surface is fixed, so the SHGC obtained for each glass based on ISO 9050 remains the same, regardless the air velocity. The SHGC results based on ISO 9050 were similar to those measured by PoWEM under conditions of higher air velocities.
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