Photometrical analysis of mirrored light pipe: From state-of-the-art on experimental results (1990–2019) to the proposition of new experimental observations in high solar potential climates

Thermal and spectral impact of building integrated Mirrored Light Pipe to human circadian rhythms and thermal environment

“…Overcast sky Clear sky Intermediate sky specular reflection inside the light pipe must significantly impact the amount of energy transmitted, just as it was noticed for the illuminance in later works [8]. When we study the relationship between outdoor and indoor irradiance (Figure 9), we notice a strong positive linear correlation between the two parameters with an R 2 coefficient of 96.9% (see the red frame of Figure 9).…”

“…Reunion Island is very particular because of its high solar irradiation. As we have seen in a previous study [8] and confirmed by the literature, it is necessary to study the environment of the light pipes to understand their behavior. For this reason, we have chosen to set up an experiment to verify and validate the literature observations.…”

“…They allow the transport and distribution of daylight into dark rooms, away from traditional openings. Previous work [8,9] has shown the photometric performance of the light pipe LW Long-wavelength [-] in extreme sunlight situations (maximum global illuminance of about 200 Klux). Moreover, they seem to offer the advantage of minimizing light loss and heat gain while guaranteeing that the light retains all its healthrelated properties.…”

Technological Review of Tubular Daylight Guide System from 1982 to 2020

“…Several studies have found that light collection is the function of the light pipe to be optimized [32], [34], [66], [67]. The prospects for improvement should focus on increasing the capture of global external illuminance while ensuring low cost and maintenance.…”

Real time side-by-side experimental validation of energy and comfort performance of a zero net energy retrofit package for small commercial buildings

“…The interior of small commercial buildings is often organized into smaller spaces, with limited daylight availability beyond the spaces that happen to be illuminated by windows, which may or may not be of substantial size, especially in older buildings. Skylights are a tried and tested way of bringing daylight to interior spaces; in recent decades, tubular daylight devices (TDDs) have emerged as a viable option to achieve substantial levels of daylight illumination while minimizing the negative thermal impacts of an envelope opening on the roof (Malet-Damour, 2019). Another advantage of the minimal roof area TDDs require when compared with conventional skylights is the fact that they leave a higher proportion of roof area available for solar collection by photovoltaic panels; this is particularly important when attempting to reach zero net energy building operation.…”