Abstract
The thermal transmittance of the building envelope greatly affects the heating and cooling load and is measured in accordance with ISO 9869-1. This method estimates the in situ U-value by measuring heat flux through the test wall and the temperature difference between the internal and external environments. Thermal transmittance can be calculated from data measured over five days under stable environmental conditions. However, if the environmental conditions are unstable, the minimum test period may be longer than 10 days to obtain reliable results. Therefore, in this method, the temperature difference between the inside and outside of the wall should be 10℃ or more, and the influence of solar radiation should be minimized. For a south-facing wall, the heat flux fluctuation is so large that it takes twice as long to be a convergence condition proposed by ISO 9869-1. This study aimed to analyze heat flow characteristics through a south-facing wall directly exposed to solar radiation and its convergence condition for thermal transmittance calculation.
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