Uncertainty and sensitivity analyses of energy and visual performances of ofﬁce building with external venetian blind shading in hot-dry climate
Lazarus, I. J.
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Copyright: 2016. Eslevier. 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 South African Journal of Applied Energy , Vol 184. Pp 155-170. http://www.sciencedirect.com/science/article/pii/S0306261916314313
Fenestration has become an integral part of the buildings and has a signiﬁcant impact on the energy and indoor visual performances. Inappropriate design of the fenestration component may lead to low energy efﬁciency and visual discomfort as a result of high solar and thermal heat gains, excessive daylight and direct sunlight. External venetian blind has been identiﬁed as one of the effective shading devices for con-trolling the heat gains and daylight through fenestration. This study explores uncertainty and sensitivity analyses to identify and prioritize the most inﬂuencing parameters for designing glazed components that include external shading devices for ofﬁce buildings. The study was performed for hot-dry climate of Jodhpur (Latitude 26 1800N, longitude 73 0100E) using EnergyPlus, a whole building energy simulation tool providing a large number of inputs for eight façade orientations. A total 150 and 845 data points (for each orientation) for input variables were generated using Hyper Cubic Sampling and extended FAST methods for uncertainty and sensitivity analyses respectively. Results indicated a large uncertainty in the lighting, HVAC, source energy consumptions and useful daylight illuminance (UDI). The estimated coefﬁcients of variation were highest (up to 106%) for UDI, followed by lighting energy (up to 45%) and HVAC energy use (around 33%). The sensitivity analysis identiﬁed window to wall ratio, glazing type, blind type (orientation of slats) and slat angle as highly inﬂuencing factors for energy and visual perfor-mances regardless of façade orientation. The other inﬂuencing parameters are interior surface absorp-tance of wall and front surface solar reﬂectance of blind slat; however, the magnitude of inﬂuence varied with façade orientation.
Singh, R.; Lazarus, I. J. and Kishore, V.V.N. 2016. Uncertainty and sensitivity analyses of energy and visual performances of ofﬁce building with external venetian blind shading in hot-dry climate. Applied Energy. 184: 155-170.