Application of external horizontal shading slats for daylighting through north-facing windows
Article Sidebar
Main Article Content
Abstract
Shading slats allow for illumination of indoor spaces by the use of natural daylight while preventing the penetration of undesirable beam solar radiation. Extensive research has been performed on the use of shading slats on south-facing windows in tropical climate. However, studies on the use of this shading device for north-facing windows are rare, owing to the prevailing assumption that they are not beneficial for north-oriented facades at higher latitudes. This study investigated the operation and energy-saving potential of adjustable external horizontal slats installed on north-facing windows of office buildings in a tropical climate. Full-scale experiments were performed and the results were used to validate a simulation model. Simulations were performed to estimate the energy consumption in offices of varying dimensions over a full year. The appropriate slat adjustment angles for each month were determined and total lighting and air conditioning energy savings of up to 50% were estimated in comparison to the use of unshaded windows with heat-reflective glass.
Downloads
Article Details
References
Alzoubi, H. H., and Al-Zoubi, A. H. (2010). Assessment of building façade performance in terms of daylighting and the associated energy consumption in architectural spaces: vertical and horizontal shading devices for southern exposure facades. Energy Conversion and Management, 51(8), 1592-1599.
Aste, N., Compostella, J., and Mazzon, M. (2012). Comparative energy and economic performance analysis of an electrochromic window and automated external venetian blind. Energy Procedia, 30, 404-413.
Chaiwiwatworakul, P., Chirarattananon, S., and Matuampunwong, D. (2012). Energy saving potential from daylighting through external multiple-slat shaded window in the tropics. International Journal of Renewable Energy Research, 2(3), 376-383.
Chaiwiwatworakul, P., Mettanant, V., and Fathoni, A. M. (2016). Energy analysis of the daylighting from a double-pane glazed window with enclosed horizontal slats in the tropics. Energy and Buildings, 128, 413-430.
Cheng, C. L., Chen, C. L., Chou, C. P., and Chan, C. Y. (2007). A mini-scale modeling approach to natural daylight utilization in building design. Building and Environment, 42(1), 372-384.
Chirarattananon, S., and Hien, V. D. (2011). Thermal performance and cost effectiveness of massive walls under Thai climate. Energy and Buildings, 43(7), 1655-1662.
Datta, G. (2001). Effect of fixed horizontal louver shading devices on thermal performance of building by TRNSYS simulation. Renewable Energy, 23(3-4), 497-507.
Hammad, F., and Abu-Hijleh, B. (2010). The energy savings potential of using dynamic external louvers in an office building. Energy and Buildings, 42(10), 1888-1895.
Hien, V. D., and Chirarattananon, S. (2005). Triangular subdivision for the computation of form factors. Leukos, 2(1), 41-59.
González, J., and Fiorito, F. (2015). Daylight design of office buildings: optimisation of external solar shadings by using combined simulation methods. Buildings, 5(2), 560-580.
Kirimtat, A., Koyunbaba, B. K., Chatzikonstantinou, I., and Sariyildiz, S. (2016). Review of simulation modeling for shading devices in buildings. Renewable and Sustainable Energy Reviews, 53, 23-49.
Li, D. H. W., and Tsang, E. K. W. (2008). An analysis of daylighting performance for office buildings in Hong Kong. Building Environment, 43(9), 1446-1458.
Nielsen, M. V., Svendsen, S., and Jensen, L. B. (2011). Quantifying the potential of automated dynamic solar shading in office buildings through integrated simulations of energy and daylight. Solar Energy, 85(5), 757-768.
O'Brien, W., Kapsis, K., and Athienitis, A. K. (2013). Manually-operated window shade patterns in office buildings: A critical review. Building Environment, 60, 319-338.
Perez, R., Ineichen, P., Seals, R. Michalsky, J., and Stewart, R. (1990). Modeling daylight availability and irradiance components from direct and global irradiance. Solar Energy, 44(5), 271-289.
Stazi, F., Marinelli, S., Di Perna, C., and Munafò, P. (2014). Comparison on solar shadings: monitoring of the thermo-physical behaviour, assessment of the energy saving, thermal comfort, natural lighting and environmental impact. Solar Energy, 105, 512-528.
Tzempelikos, A., and Athienitis, A. K. (2007). The impact of shading design and control on building cooling and lighting demand. Solar Energy, 81(3), 369-382.
Yao, J., Chow, D. H. C., Zheng, R. Y., and Yan, C. W. (2016). Occupants’ impact on indoor thermal comfort: A co-simulation study on stochastic control of solar shades. Journal of Building Performance Simulation, 9(3), 272-287.