A Comparative Analysis of the Visual Comfort Performance between a PCM Glazing and a Conventional Selective Double Glazed Unit

Luigi Giovannini, Francesco Goia, Valerio R. M. Lo Verso and Valentina Serra
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Luigi Giovannini: TEBE Research Group, Department of Energy, Politecnico di Torino, C.so Duca degli Abruzzi 24, 10129 Turin, Italy
Francesco Goia: Department of Architecture and Technology, Faculty of Architecture and Design, Norwegian University of Science and Technology, Alfred Getz’ vei 3, 7491 Trondheim, Norway
Valerio R. M. Lo Verso: TEBE Research Group, Department of Energy, Politecnico di Torino, C.so Duca degli Abruzzi 24, 10129 Turin, Italy
Valentina Serra: TEBE Research Group, Department of Energy, Politecnico di Torino, C.so Duca degli Abruzzi 24, 10129 Turin, Italy

Sustainability, 2018, vol. 10, issue 10, 1-20

Abstract: The performance of a Double Glazing Unit (DGU) with a Phase Change Material (PCM) layer embedded in the cavity was analyzed in terms of the visual comfort perceived by the occupants. The analysis was carried out through a set of simulations, performed by the Radiance engine managed through Honeybee. As an input for the simulations, the visible transmittance T v of PCM in solid (diffusing) state was used, based on previous laboratory measurements. The simulations were run for several specific times of the year: The two solstices and the autumn equinox, for different hours during the day. Other variables investigated were the site (Östersund, 63.2° N; Turin, 45.2° N; Abu Dhabi, 24.4° N), the room orientation (south; west), and the sky conditions (clear sky with sun; overcast). For comparative purpose, the simulations were repeated for the same boundary conditions in a room equipped with a selective glazing, with a T v of 0.5. For each case, the visual comfort perceived by the occupants has been analyzed in terms of Daylight Glare Probability ( DGP ) in two different points in the room and of “Spatial Useful Illuminance” (percent of work plane points where the illuminance lies in the range 100–3000 lx). The results showed that the glazed package with PCM in most cases admits more daylight into the room, resulting into an increased glare ( DGP values), but also in lower Spatial Useful Illuminance values.

Keywords: visual comfort; glare; phase change material (PCM); daylight simulation; Daylight Glare Probability; Spatial Useful Illuminance; Radiance simulations (search for similar items in EconPapers)
JEL-codes: O13 Q Q0 Q2 Q3 Q5 Q56 (search for similar items in EconPapers)
Date: 2018
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (2)

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