Effect of internal woven roller shade and glazing on the energy and daylighting performances of an ofﬁce building in the cold climate of Shillong
Lazarus, I. J.
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Copyright: 2015. Elsevier. Due to copyright restrictions, only the abstract is available. For access to the full text item, please consult the publisher's website. The definitive version of the work is published in Applied Energy, Vol 159, 317-333 http://dx.doi.org/10.1016/j.apenergy.2015.09.009
The energy and visual performances of the façades are deﬁned by many parameters including façade size, properties of glazings and shadings, and their arrangements as well as control strategies. In this study, a number of combinations of internal woven roller shades and four double glazings have been proposed and assessed in integrated manner in order to improve the energy efﬁciency and visual comfort in new or existing ofﬁce buildings. Ofﬁce rooms facing south, east, north and west have been simulated for cold climate, by varying glazed areas and proposed glazing and shading alternatives. Results have been calculated, compared and analyzed in terms of the energy consumptions, energy saving potentials, daylight autonomy, useful daylight illuminance and discomfort glare free time, for each of the combina-tions. Simulation results show that the choice of glazing and shading alternatives can have substantial impact on energy and visual performances of the ofﬁce space. Regardless of façade orientation, the max-imum energy saving is achieved for a window-to-wall ratio (WWR) of 30%. Saving potential decreases signiﬁcantly for larger glazed area and for each façade orientation. For all façade orientations and glazed areas (except for 30% WWR in the north wall), a bare low-e coated double glazing (U = 1.616 W/m2 K, SHGC = 0.209, sv = 0.301) is found to be the most energy efﬁcient choice. For 30% north glazing, the energy efﬁciency can be maximized with a different bare low-e coated double glazing (U = 1.628 W/m2 K, SHGC = 0.370, sv = 0.581). Moreover, glare affected time, daylight autonomy and useful daylight illuminance in the ofﬁce spaces with these glazing choices are estimated P50%, between 46% and 99%and in the range of 53–88% respectively. Also, the visual comfort can further be improved just by deploy-ing even a highly transparent fabric (50% transmittance, 20% reﬂectance, 45% average openness) as an interior roller shade with these glazing choices.
Singh, R.; Lazarus, I.J. and Kishore, V.V.N. 2015. Effect of internal woven roller shade and glazing on the energy and daylighting performances of an ofﬁce building in the cold climate of Shillon. Applied Energy. 159: 317-333.