G-box: a transportable device for in-situ measure of window's Solar Heat Gain Coefficient

Gallinelli, Peter and Camponovo, Reto and Crivellin, Dimitri and Margot, Sylvie and Pahud, Daniel and Belliardi, Marco (2014) G-box: a transportable device for in-situ measure of window's Solar Heat Gain Coefficient. In: Energie- und Umweltforschung im Bauwesen Schweizerisches Status-Seminar 2014, 4-5 September 2014, ETH, Zurich.

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The main objective of the project is the development of a transportable calorimeter, easily reproducible on the basis of a prototype, which allows for the assessment of the g-value of glazing and window systems, i.e. the fraction of incident solar energy that is transmitted inside. Unlike standard calorimeters for laboratory Solar Heat Gain Coefficient (SHGC or gvalue)assessment, the device is temporarily mounted on existing facades to measure their real behavior (single skin, double skin, opaque glass facades), including their possible solar protections. The project includes measurements on representative facades in real operating conditions. Advantages and limitations of the g-box device are characterized. Dynamic effect of shadows, such as the slat position of a venetian blind, can be shown by the g-box. An overestimation of the g-value makes more in-depth studies necessary to improve the measurement and analysis procedure of the device. This latter already presents very good and satisfactory characteristics.

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