Effects of Interior and Exterior Shading Elements on the Indoor Thermal Environment for Buildings in a Semiarid Climate
Publication: Journal of Architectural Engineering
Volume 31, Issue 1
Abstract
In semiarid climates, buildings with extensive glazing often become overheated by direct solar radiation in the summer. Careful selection of shading devices (SDs) is crucial to mitigate this issue. This study is a comprehensive evaluation of the indoor thermal performance of various internal and external SDs in a semiarid Indian city. A total of 150 simulations using EnergyPlus were conducted for windows with no shading (NS), fixed shading elements [egg-crates (ECs) and overhangs (OVs)], and movable SDs [louvers (LVs) and internal blinds (BLs)]. Such parameters as the window/wall ratio (WWR), the window facade direction, the slat angle of LVs and BLs, and the OV depth were varied. Indoor thermal performance was assessed for windows facing south and west before the monsoon (May) and in winter (December). Results indicated that LVs and BLs with a 45° slat angle offered superior thermal conditions, reducing mean radiant temperature (MRT) and indoor air temperature by up to 3.0°C and 1.5°C, respectively, for west-facing windows with larger WWRs in summer. Moreover, LVs at 45° showed better reduction in cooling energy consumption than NS conditions (from 7.5% to 16.8% for west-facing windows) at varied WWRs compared with other SDs. Increasing the OV depth to 1 m reduced window heat gain rates but had minimal impact on indoor air temperature and MRT. This study has implications for buildings in similar climates, where summers are hot and winters are mild.
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Data Availability Statement
Some or all data, models, or code that support the findings of this study are available from the corresponding author on reasonable request.
References
Aldawoud, A. 2013. “Conventional fixed shading devices in comparison to an electrochromic glazing systems in hot, dry climate.” Energy Build. 59: 104–110. https://doi.org/10.1016/j.enbuild.2012.12.031.
ASHRAE. 2010. Ventilation for acceptable indoor Air quality. ASHRAE 62.1. Peachtree Corners, GA: American Society of Heating, Refrigerating and Air-Conditioning Engineers.
ASHRAE. 2017. Thermal environmental conditions for human occupancy. ASHRAE 55. Peachtree Corners, GA: American Society of Heating, Refrigerating and Air-Conditioning Engineers.
Atzeri, A., F. Cappelletti, and A. Gasparella. 2014. “Internal versus external shading devices performance in office buildings.” Energy Procedia 45: 463–472. https://doi.org/10.1016/j.egypro.2014.01.050.
Datta, G. 2001. “Effect of fixed horizontal louver shading devices on thermal performance of building by TRNSYS simulation.” Renewable Energy 23: 497–507. https://doi.org/10.1016/S0960-1481(00)00131-2.
Ebrahimpour, A., and M. Maerefat. 2011. “Application of advanced glazing and overhangs in residential buildings.” Energy Convers. Manage. 52: 212–219. https://doi.org/10.1016/j.enconman.2010.06.061.
Evola, G., F. Gullo, and L. Marletta. 2017. “The role of shading devices to improve thermal and visual comfort in existing glazed buildings.” Energy Procedia 134: 346–355. https://doi.org/10.1016/j.egypro.2017.09.543.
Freewan, A. A. Y. 2014. “Impact of external shading devices on thermal and daylighting performance of offices in hot climate regions.” Sol. Energy 102: 14–30. https://doi.org/10.1016/j.solener.2014.01.009.
Ghosh, A., and S. Neogi. 2018. “Effect of fenestration geometrical factors on building energy consumption and performance evaluation of a new external solar shading device in warm and humid climatic condition.” Sol. Energy 169: 94–104. https://doi.org/10.1016/j.solener.2018.04.025.
Hernández, F. F., J. M. C. López, J. M. P. Suárez, M. C. G. Muriano, and S. C. Rueda. 2017. “Effects of louvers shading devices on visual comfort and energy demand of an office building. A case of study.” Energy Procedia 140: 207–216. https://doi.org/10.1016/j.egypro.2017.11.136.
India Census. 2011. “Primary Census Abstract Indicators Search upto town/village level.” Accessed October 8, 2024. https://censusindia.gov.in/census.website/data/data-visualizations/PopulationSearch_PCA_Indicators.
IS (Indian Standard). 1978. Guide for heat insulation of non industrial buildings [CED 12: Functional requirements in buildings]. Indian Standard 3792. New Delhi, India: IS.
Kaushik. H. 2020. “City's built-up area up 80% in 11 years.” Times of India, June 11, 2020. Accessed October 8, 2024. https://timesofindia.indiatimes.com/city/ahmedabad/citys-built-up-area-up-80-in-11-years/articleshow/76310224.cms.
Kaushik H., and N. Parikh. 2023. “Ahmedabad worst in green cover erosion in last decade.” Times of India, March 21, 2023. Accessed October 8, 2024. https://timesofindia.indiatimes.com/city/ahmedabad/ahmedabad-worst-in-green-cover-erosion-in-last-decade/articleshow/98846731.cms.
Kim, G., H. S. Lim, T. S. Lim, L. Schaefer, and J. T. Kim. 2012. “Comparitive advantage of an exterior shading device in thermal performance for residential buildings.” Energy Build. 46: 105–111. https://doi.org/10.1016/j.enbuild.2011.10.040.
Kim, J. T., and G. Kim. 2010. “Advanced external shading device to maximize visual and view performance.” Indoor Built Environ. 19 (1): 65–72. https://doi.org/10.1177/1420326X09358001.
Kirmitat, A., B. K. Koyunbaba, I. Chatzikonstantinou, and S. Sariyildiz. 2016. “Review of simulation modeling for shading devices in buildings.” Renewable Sustainable Energy Rev. 53: 23–49. https://doi.org/10.1016/j.rser.2015.08.020.
Koç, S. G., and S. M. Kalfa. 2021. “The effects of shading devices on office building energy performance in Mediterranean climate regions.” J. Build. Eng. 44: 102653. https://doi.org/10.1016/j.jobe.2021.102653.
Köppen, W., and R. Geiger. 1930. Handbuch der klimatologie. Berlin: Gebrüder Borntraeger.
Kunwar, N., K. S. Cetin, U. Passe, X. Zhou, and Y. Li. 2019. “Full-Scale experimental testing of integrated dynamically-operated roller shades and lighting in perimeter office spaces.” Sol. Energy 186: 17–28. https://doi.org/10.1016/j.solener.2019.04.069.
Kunwar, N., K. S. Cetin, U. Passe, X. Zhou, and Y. Li. 2020. “Energy savings and daylighting evaluation of dynamic venetian blinds and lighting through full-scale experimental testing.” Energy 197: 117190. https://doi.org/10.1016/j.energy.2020.117190.
Mandalaki, M., K. Zervas, T. Tsoutsos, and A. Vazakas. 2012. “Assessment of fixed shading devices with integrated PV for efficient energy use.” Sol. Energy 86 (9): 2561–2575. https://doi.org/10.1016/j.solener.2012.05.026.
Marsh, A. J. 2015. “Software development.” Andrew’s blog. Accessed March 30, 2024. https://andrewmarsh.com/software/.
Mettanant, V., and P. Chaiwiwatworaku. 2014. “Automated vertical blinds for daylighting in tropical regions.” Energy Procedia 52: 278–286. https://doi.org/10.1016/j.egypro.2014.07.079.
Palmero-Marrero, A. I., and A. C. Oliveira. 2010. “Effect of louver shading devices on building energy requirements.” Appl. Energy 87: 2040–2049. https://doi.org/10.1016/j.apenergy.2009.11.020.
Tewari, P., S. Mathur, J. Mathur, S. Kumar, and V. Loftness. 2019. “Field study on indoor thermal comfort of office buildings using evaporative cooling in the composite climate of India.” Energy Build. 199: 145–163. https://doi.org/10.1016/j.enbuild.2019.06.049.
Thorsson, S., T. Honjo, F. Lindberg, I. Eliasson, and E. M. Lim. 2007. “Thermal comfort and outdoor activity in Japanese urban public places.” Environ. Behav. 39 (5): 660–684. https://doi.org/10.1177/0013916506294937.
Tzempelikos, A. 2008. “The impact of venetian blind geometry and tilt angle on view, direct light transmission and interior illuminance.” Sol. Energy 82 (12): 1172–1191. https://doi.org/10.1016/j.solener.2008.05.014.
Tzempelikos, A., and H. Shen. 2013. “Comparative control strategies for roller shades with respect to daylighting and energy performance.” Build. Environ. 67: 179–192. https://doi.org/10.1016/j.buildenv.2013.05.016.
Ye, Y., P. Xu, J. Mao, and Y. Ji. 2016. “Experimental study on the effectiveness of internal shading devices.” Energy Build. 111: 154–163. https://doi.org/10.1016/j.enbuild.2015.11.040.
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Published In
Journal of Architectural Engineering
Volume 31 • Issue 1 • March 2025
Copyright
© 2024 American Society of Civil Engineers.
History
Received: Apr 4, 2023
Accepted: Aug 5, 2024
Published online: Oct 18, 2024
Published in print: Mar 1, 2025
Discussion open until: Mar 18, 2025
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