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Measured energy savings from the application of reflective roofs in two small non-residential buildings

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  • Akbari, H

Abstract

Energy use and environmental parameters were monitored in two small (14.9 m2) non-residential buildings during the summer of 2000. The buildings were initially monitored for about 1 1/2 months to establish a base condition. The roofs of the buildings were then painted with a white coating and the monitoring was continued. The original solar reflectivities of the roofs were about 26%; after the application of roof coatings the reflectivities increased to about 72%. The monitored electricity savings were about 0.5 kWh per day (33 Wh/m2 per day). The estimated annual savings are about 125 kWh per year (8.4 kWh/m2); at a cost of $0.1/kWh, savings are about $0.86/m2 per year. Obviously, it costs significantly more than this amount to coat the roofs with reflective coating, particularly because of the remote locations of these buildings. However, since the pre-fabricated roofs are already painted green at the factory, painting them a white (reflective) color would bring no additional cost. Hence, a reflective roof saves energy at no incremental cost.

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  • Akbari, H, 2003. "Measured energy savings from the application of reflective roofs in two small non-residential buildings," Energy, Elsevier, vol. 28(9), pages 953-967.
    • Handle: RePEc:eee:energy:v:28:y:2003:i:9:p:953-967
    DOI: 10.1016/S0360-5442(03)00032-X
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    Cited by:

    1. Hirano, Y. & Fujita, T., 2012. "Evaluation of the impact of the urban heat island on residential and commercial energy consumption in Tokyo," Energy, Elsevier, vol. 37(1), pages 371-383.
    2. Tiago Souto & Margarida Almeida & Vítor Leal & João Machado & Adélio Mendes, 2020. "Total Solar Reflectance Optimization of the External Paint Coat in Residential Buildings Located in Mediterranean Climates," Energies, MDPI, vol. 13(11), pages 1-18, May.
    3. Wendy Miller & Glenn Crompton & John Bell, 2015. "Analysis of Cool Roof Coatings for Residential Demand Side Management in Tropical Australia," Energies, MDPI, vol. 8(6), pages 1-16, June.
    4. Zhu, L. & Hurt, R. & Correa, D. & Boehm, R., 2009. "Comprehensive energy and economic analyses on a zero energy house versus a conventional house," Energy, Elsevier, vol. 34(9), pages 1043-1053.
    5. Testa, Jenna & Krarti, Moncef, 2017. "A review of benefits and limitations of static and switchable cool roof systems," Renewable and Sustainable Energy Reviews, Elsevier, vol. 77(C), pages 451-460.
    6. Alberto Speroni & Andrea Giovanni Mainini & Andrea Zani & Riccardo Paolini & Tommaso Pagnacco & Tiziana Poli, 2022. "Experimental Assessment of the Reflection of Solar Radiation from Façades of Tall Buildings to the Pedestrian Level," Sustainability, MDPI, vol. 14(10), pages 1-29, May.
    7. Doug, Banting & Hitesh, Doshi & James, Li & Paul, Missios, 2005. "Report on the Environmental Benefits and Costs of Green Roof Technology for the City of Toronto," MPRA Paper 70526, University Library of Munich, Germany.
    8. Butt, Afaq A. & de Vries, Samuel B. & Loonen, Roel C.G.M. & Hensen, Jan L.M. & Stuiver, Anthonie & van den Ham, Jonathan E.J. & Erich, Bart S.J.F., 2021. "Investigating the energy saving potential of thermochromic coatings on building envelopes," Applied Energy, Elsevier, vol. 291(C).
    9. Yang, Jiachuan & Wang, Zhi-Hua & Kaloush, Kamil E., 2015. "Environmental impacts of reflective materials: Is high albedo a ‘silver bullet’ for mitigating urban heat island?," Renewable and Sustainable Energy Reviews, Elsevier, vol. 47(C), pages 830-843.
    10. Tsang, S.W. & Jim, C.Y., 2011. "Theoretical evaluation of thermal and energy performance of tropical green roofs," Energy, Elsevier, vol. 36(5), pages 3590-3598.
    11. Jo, J.H. & Carlson, J. & Golden, J.S. & Bryan, H., 2010. "Sustainable urban energy: Development of a mesoscale assessment model for solar reflective roof technologies," Energy Policy, Elsevier, vol. 38(12), pages 7951-7959, December.
    12. Xu, Ling & Wang, Jiayu & Xiao, Feipeng & EI-Badawy, Sherif & Awed, Ahmed, 2021. "Potential strategies to mitigate the heat island impacts of highway pavement on megacities with considerations of energy uses," Applied Energy, Elsevier, vol. 281(C).
    13. Kontoleon, Karolos J. & Saboor, Shaik & Mazzeo, Domenico & Ahmad, Jawad & Cuce, Erdem, 2023. "Thermal sensitivity and potential cooling-related energy saving of masonry walls through the lens of solar heat-rejecting paints at varying orientations," Applied Energy, Elsevier, vol. 329(C).
    14. Friedman, Chanoch & Becker, Nir & Erell, Evyatar, 2014. "Energy retrofit of residential building envelopes in Israel: A cost-benefit analysis," Energy, Elsevier, vol. 77(C), pages 183-193.
    15. Yu Zhang & Lei Zhang & Luyao Ma & Qinglin Meng & Peng Ren, 2019. "Cooling Benefits of an Extensive Green Roof and Sensitivity Analysis of Its Parameters in Subtropical Areas," Energies, MDPI, vol. 12(22), pages 1-22, November.
    16. Anna Laura Pisello & Federico Rossi & Franco Cotana, 2014. "Summer and Winter Effect of Innovative Cool Roof Tiles on the Dynamic Thermal Behavior of Buildings," Energies, MDPI, vol. 7(4), pages 1-19, April.
    17. Hideki Takebayashi, 2016. "High-Reflectance Technology on Building Façades: Installation Guidelines for Pedestrian Comfort," Sustainability, MDPI, vol. 8(8), pages 1-9, August.

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