INFLUÊNCIA DA VELOCIDADE DO VENTO NO FATOR SOLAR DE VIDRO S DE CONTROLE SOLAR MONOLÍTICOS E LAMINADOS

Abstract

The solar factor of glazing is the fraction of incident solar radiation admitted through a glass system, both directly transmitted and absorbed and subsequently released inward. Solar factor is directly influenced by the wind speed, which affects the heat exchanges with the external environment, which are dependent of radiative and convective heat transfer between the surfaces exposed to the external environment. The main objective of this work is to analyse the influence of wind speed (0 to 10m/s) in the solar factor of six solar control glasses, monolithic (4mm) and laminated (8mm), and one reference clear glass (4mm). Solar factor was calculated by computational simulation in WINDOW software, using optical proprieties and thermal emittance obtained in spectrometric measurements in laboratory. For all glasses, the increase in wind speed caused a decrease in the solar factor due to the increase in the exterior surface convective heat transfer coefficient, and this reduction was more significant in high absorption glazing, whose relative variation reached 40%.