Moraekip, E. (2025). Thermochromic Glass Facades: A Sustainable Solution for Improving Buildings Energy Efficiency A Simulation-Based Study of an Office Building in Cairo, Egypt. JES. Journal of Engineering Sciences, 53(2), 126-152. doi: 10.21608/jesaun.2025.343887.1390
Eslam Mohamed Moraekip. "Thermochromic Glass Facades: A Sustainable Solution for Improving Buildings Energy Efficiency A Simulation-Based Study of an Office Building in Cairo, Egypt". JES. Journal of Engineering Sciences, 53, 2, 2025, 126-152. doi: 10.21608/jesaun.2025.343887.1390
Moraekip, E. (2025). 'Thermochromic Glass Facades: A Sustainable Solution for Improving Buildings Energy Efficiency A Simulation-Based Study of an Office Building in Cairo, Egypt', JES. Journal of Engineering Sciences, 53(2), pp. 126-152. doi: 10.21608/jesaun.2025.343887.1390
Moraekip, E. Thermochromic Glass Facades: A Sustainable Solution for Improving Buildings Energy Efficiency A Simulation-Based Study of an Office Building in Cairo, Egypt. JES. Journal of Engineering Sciences, 2025; 53(2): 126-152. doi: 10.21608/jesaun.2025.343887.1390
Thermochromic Glass Facades: A Sustainable Solution for Improving Buildings Energy Efficiency A Simulation-Based Study of an Office Building in Cairo, Egypt
Architecture Engineering Department - Faculty of Engineering and Technology - Badr University in Cairo (BUC) - Cairo, Egypt
Abstract
The built environment enhances human life, prompting architects and engineers to adopt innovative technologies for better building performance. Thermochromic glass has gained attention as a sustainable solution for improving energy efficiency by adjusting solar heat gains based on external temperatures. This study examines the energy performance of thermochromic glass in an office building in Cairo's new administrative capital, known for its hot-arid climate, using advanced simulation tools to compare its thermal and optical properties to conventional glazing systems including Design Builder Software Ltd. and Energy Plus, to analyze two distinct building scenarios: one with conventional glazing and the other using thermochromic glass technology. Both scenarios incorporated typical occupancy patterns, heating, ventilating, and air conditioning systems, to evaluate energy consumption, thermal comfort, and daylight performance. Study findings indicate that thermochromic glass significantly reduces cooling energy demand by limiting solar heat gain during peak temperatures while maintaining adequate daylight levels. It recorded remarkable reductions in solar heat gain through the building's external glazing system, achieving reductions of up to 90.18 % compared to buildings with conventional glazing. This translates to annual energy savings of up to 51.16 % compared to conventional glazing, highlighting its potential to decrease energy loads in areas with extreme heat. Additionally, this system enhances indoor thermal comfort by minimizing overheating and decreasing reliance on artificial cooling systems. The findings highlight the viability of thermochromic glass as a cost-effective and environmentally friendly technology for sustainable building design in hot-arid climates.
[1] Aburas, M., Heidepriem, H. E., Lei, L., Li, M., Zhao, J., Williamson, T., . . . Soebarto, V. (2021).Smart windows – Transmittance tuned thermochromic coatings for dynamic control of building performance (Paper) (Vol. 235). USA: Journal of Energy and Buildings - Elsevier Ltd. doi:10.1016/j.enbuild.2021.110717
[2] Aksamija, A. (2016).Integrating Innovation in Architecture - Design, Methods, and Technology for Progressive Practice and Research (Book). West Sussex, United Kingdom: John Wiley and Sons Ltd.
[3] Behera, A. (2022).Advanced Materials - An Introduction to Modern Materials Science (Book). Cham, Switzerland: Springer Nature Switzerland AG. doi:10.1007/978-3-030-80359-9
[4] Costanzo, V., Evola, G., & Marletta, L. (2016).Thermal and visual performance of real and theoretical thermochromic glazing solutions for office buildings (Paper) (Vol. 149). USA: Journal of Solar Energy Materials and Solar Cells - Elsevier Ltd. doi:10.1016/j.solmat.2016.01.008
[5] Design Builder Software Limited - Energy Plus. (Building Performance Simulation Software). (V. 7.0.0.116 - V. 9.4.0). Stroud, United Kingdom, Stroud, United Kingdom: Design Builder Software Limited - Energy Plus. Retrieved 2024, from https://designbuilder.co.uk/
[6] Detsi, M., Atsonios, I., Mandilaras, I., & Founti, M. (2024).Effect of Smart Glazing with Electrochromic and Thermochromic Layers on Building’s Energy Efficiency and Cost (Paper) (Vol. 319). Zografou, Greece: Journal of Energy and Buildings - Elsevier Ltd. doi:10.1016/j.enbuild.2024.114553
[7] Es-sakali, N., Kaitouni, S. I., Laasri, I. A., Mghazli, M. O., Cherkaoui, M., & Pfafferott, J. (2024). Static and Dynamic Glazing Integration for Enhanced Building Efficiency and Indoor Comfort with Thermochromic and Electrochromic Windows (Paper) (Vol. 52). Rabat, Morocco: Thermal Science and Engineering Progress - Elsevier Ltd. doi:10.1016/j.tsep.2024.102681
[8] Giovannini, L., Favoino, F., Pellegrino, A., Verso, V. R., Serra, V., & Zinzi, M. (2019).Thermochromic glazing performance: From component experimental characterisation to whole building performance evaluation (Paper) (Vol. 251). USA: Journal of Applied Energy - Elsevier Ltd. doi:10.1016/j.apenergy.2019.113335
[9] Jin, Q., Long, X., & Liang, R. (2022).Numerical analysis on the thermal performance of PCM-integrated thermochromic glazing systems (Paper) (Vol. 257). USA: Journal of Energy and Buildings - Elsevier Ltd. doi:10.1016/j.enbuild.2021.111734
[10] Kitsopoulou, A., Bellos, E., Sammoutos, C., Lykas, P., Vrachopoulos, M. G., & Tzivanidis, C. (2024).A detailed investigation of thermochromic dye-based roof coatings for Greek climatic conditions (Paper) (Vol. 84). USA: Journal of Building Engineering - Elsevier Ltd. doi:10.1016/j.jobe.2024.108570
[11] Kokogiannakis, G., Darkwa, J., & Aloisio, C. (2014).Simulating Thermochromic and Heat Mirror Glazing Systems in Hot and Cold Climates (Paper) (Vol. 62). USA: Energy Procedia - Elsevier Ltd. doi:10.1016/j.egypro.2014.12.363
[12] Li, W., Tao, T., Xu, J., & Chen, Z. (2024).Thermal performance of thermochromic smart windows in different indoor environments (Paper) (Vol. 324). USA: Journal of Energy and Buildings - Elsevier Ltd. doi:10.1016/j.enbuild.2024.114941
[13] Liu, S., Liu, Z., Wang, J., Ding, X., & Meng, X. (2023). Effect of the material color on optical properties of thermochromic coatings employed in buildings (Paper) (Vol. 45). USA: Journal of Case Studies in Thermal Engineering - Elsevier Ltd. doi:10.1016/j.csite.2023.102916
[14] Lyons, A. (2014).Materials for Architects and Builders (Book) (Fifth Edition ed.). Oxford, United Kingdom: Routledge - Taylor and Francis Group.
[15] Moraekip, E. M. (2013).Sustainable Architecture Between Theory and Application in Egypt (Book). Berlin, Germany: LAP Lambert Academic Publishing.
[16] Moraekip, E. M. (2018).Nano-Technology - As an Application to Improve Buildings Envelope's Performance (Book). Berlin, Germany: LAP LAMBERT Academic Publishing.
[18] Sage Glass and Saint Gobain. (Web Page).(2024).(Sage Glass and Saint Gobain) Retrieved 2024, from Saga Glass Portal: https://www.sageglass.com/
[19] Teixeira , H., Gomes, M., Rodrigues, A. M., & Aelenei, D. (2022).Assessment of the visual, thermal, and energy performance of static vs thermochromic double-glazing under different European climates (Paper) (Vol. 217). USA: Journal of Building and Environment - Elsevier Ltd. doi:10.1016/j.buildenv.2022.109115
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