Abstract
One of the major benefits of a green roof is its thermal performance compared to a conventional concrete roof building; it maintains indoor temperatures under varying outdoor temperatures. In this study, data were collected from four newly built detached buildings with a bare concrete roof, a highly reflective roof, and two green roofs, respectively. The results showed that the green roofs lowered the maximum indoor temperature by 6.83? on average compared to a bare concrete roof building, which potentially saves a substantial amount of energy required for cooling buildings. The surface energy balance analysis using the flux profile method showed that the difference in ground heat flux depending on roof type is crucial for determining the indoor temperature of a building. Moreover, the green roof consumed a considerable fraction of net radiation for the latent heat (70.7%), whereas the bare concrete roof used a larger fraction of net radiation for the sensible heat flux (45.3%) and ground heat flux (16.2%). the green roof consumed a considerable amount of net radiation for the latent heat flux, but little ground heat flux. By contrast, the bare concrete roof used a larger fraction of the net radiation for the ground heat flux and the sensible heat flux, which increased the temperature of both the indoor building and the air close to the surface. These results demonstrate that a green roof not only reduces indoor temperature fluctuation but also helps mitigate the heat island effect directly.
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References
Akbari H, Matthews HD, Seto D (2012) The long-term effect of increasing the albedo of urban areas. Environmental Research Letters 7(2)
Alcamo J, Bennett EM, Millennium Ecosystem Assessment (Program) (2003) Ecosystems and human well-being: A framework for assessment, Island Press, Washington, DC, xiv, 245
Ávila-Hernández A, Simá E, Xamán J, Hernández-Pérez I, Téllez-Velázquez E, Chagolla-Aranda MA (2020) Test box experiment and simulations of a green-roof: Thermal and energy performance of a residential building standard for Mexico. Energy and Buildings 209:109709, DOI: https://doi.org/10.1016/j.enbuild.2019.109709
Baraldi R, Neri L, Costa F, Facini O, Rapparini F, Carriero G (2019) Ecophysiological and micromorphological characterization of green roof vegetation for urban mitigation. Urban Forestry & Urban Greening 37:24–32, DOI: https://doi.org/10.1016/j.ufug.2018.03.002
Barriuso F, Urbano B (2021) Green roofs and walls design intended to mitigate climate change in urban areas across all continents. Sustainability 13(4):2245, DOI: https://doi.org/10.3390/su13042245
Bevilacqua P, Mazzeo D, Bruno R, Arcuri N (2017) Surface temperature analysis of an extensive green roof for the mitigation of urban heat island in southern mediterranean climate. Energy and Buildings 150:318–327, DOI: https://doi.org/10.1016/j.enbuild.2017.05.081
Cai L, Feng X-P, Yu J-Y, Xiang Q-C, Chen R (2019) Reduction in carbon dioxide emission and energy savings obtained by using a green roof. Aerosol and Air Quality Research 19(11):2432–2445, DOI: https://doi.org/10.4209/aaqr.2019.09.0455
Cascone S, Catania F, Gagliano A, Sciuto G (2018) A comprehensive study on green roof performance for retrofitting existing buildings. Building and Environment 136:227–239, DOI: https://doi.org/10.1016/j.buildenv.2018.03.052
Castiglia Feitosa R, Wilkinson S (2016) Modelling green roof stormwater response for different soil depths. Landscape and Urban Planning 153:170–179, DOI: https://doi.org/10.1016/j.landurbplan.2016.05.007
Cavadini GB, Cook LM (2021) Green and cool roof choices integrated into rooftop solar energy modelling. Applied Energy 296:117082, DOI: https://doi.org/10.1016/j.apenergy.2021.117082
Coutts AM, Daly E, Beringer J, Tapper NJ (2013) Assessing practical measures to reduce urban heat: Green and cool roofs. Building and Environment 70:266–276
Czemiel Berndtsson J (2010) Green roof performance towards management of runoff water quantity and quality: A review. Ecological Engineering 36(4):351–360, DOI: https://doi.org/10.1016/j.ecoleng.2009.12.014
DiGiovanni K, Montalto F, Gaffin S, Rosenzweig C (2013) Applicability of classical predictive equations for the estimation of evapotranspiration from urban green spaces: Green Roof Results. Journal of Hydrologic Engineering 18(1):99–107
Gál CV, Kántor N (2020) Modeling mean radiant temperature in outdoor spaces, A comparative numerical simulation and validation study. Urban Climate 32:100571, DOI: https://doi.org/10.1016/j.uclim.2019.100571
Gregoire BG, Clausen JC (2011) Effect of a modular extensive green roof on stormwater runoff and water quality. Ecological Engineering 37(6):963–969, DOI: https://doi.org/10.1016/j.ecoleng.2011.02.004
Hashemi SSG, Mahmud HB, Ashraf MA (2015) Performance of green roofs with respect to water quality and reduction of energy consumption in tropics: A review. Renewable and Sustainable Energy Reviews 52:669–679, DOI: https://doi.org/10.1016/j.rser.2015.07.163
Hathaway MA, Hunt FW, Jennings DG (2008) A field study of green roof hydrologic and water quality performance. Transactions of the Asabe 51(1):37–44, DOI: https://doi.org/10.13031/2013.24225
Herrera-Gomez SS, Quevedo-Nolasco A, Pérez-Urrestarazu L (2017) The role of green roofs in climate change mitigation. A case study in Seville (Spain). Building and Environment 123:575–584, DOI: https://doi.org/10.1016/j.buildenv.2017.07.036
Heusinger J, Weber S (2017) Surface energy balance of an extensive green roof as quantified by full year eddy-covariance measurements. Science of the Total Environment 577:220–230
Hoyer J, Dickhaut W, Kronawitter L, Weber B (2011) Water sensitive urban design. JOVIS Verlag GmbH, Berlin, Germany 144
Iassamen A, Sauvageot H, Jeannin N, Ameur S (2009) Distribution of tropospheric water vapor in clear and cloudy conditions from microwave radiometric profiling. Journal of Applied Meteorology and Climatology 48(3):600–615, DOI: https://doi.org/10.1175/2008JAMC1916.1
Kotsiris G, Androutsopoulos A, Polychroni E, Souliotis M, Kavga A (2019) Carbon footprint of green roof installation on school buildings in Greek Mediterranean climatic region. International Journal of Sustainable Energy 38(9):866–883, DOI: https://doi.org/10.1080/14786451.2019.1605992
Lawrence MG (2005) The relationship between relative humidity and the dewpoint temperature in moist air — A simple conversion and applications. Bulletin of the American Meteorological Society 86(2):225–234
Li Y, Babcock RW (2014) Green roofs against pollution and climate change. A review. Agronomy for Sustainable Development 34(4):695–705, DOI: https://doi.org/10.1007/s13593-014-0230-9
Liang SL, Wang DD, He T, Yu YY (2019) Remote sensing of earth’s energy budget: Synthesis and review. International Journal of Digital Earth 12(7):737–780
Lin B-S, Yu C-C, Su A-T, Lin Y-J (2013) Impact of climatic conditions on the thermal effectiveness of an extensive green roof. Building and Environment 67:26–33, DOI: https://doi.org/10.1016/j.buildenv.2013.04.026
Liu K, Bass B (2021) Performance of green roof systems. Cool Roofing Symposium 1–18
MacIvor JS, Cadotte MW, Livingstone SW, Lundholm JT, Yasui S-LE (2016) Phylogenetic ecology and the greening of cities. Journal of Applied Ecology 53(5):1470–1476, DOI: https://doi.org/10.1111/1365-2664.12667
Marasco DE, Culligan PJ, McGillis WR (2015) Evaluation of common evapotranspiration models based on measurements from two extensive green roofs in New York City. Ecological Engineering 84:451–462
Mehdi R, Nyirumuringa E, Juyeon K, Doo Hwan K (2021) Analyzing the impact of green roof functions on the citizens’ mental health in metropolitan cities. Iranian Journal of Public Health 50(5), DOI: https://doi.org/10.18502/ijph.v50i5.6107
Moghbel M, Erfanian Salim R (2017) Environmental benefits of green roofs on microclimate of Tehran with specific focus on air temperature, humidity and CO2 content. Urban Climate 20:46–58, DOI: https://doi.org/10.1016/j.uclim.2017.02.012
Monin AS, Obukhov AM (1954) Basic laws of turbulent mixing in the surface layer of the atmosphere. Tr. Akad. Nauk SSSR Geophiz. Inst. 24(151):163–187
Oberndorfer E, Lundholm J, Bass B, Coffman RR, Doshi H, Dunnett N, Gaffin S, Kohler M, Karen KYL, Rowe B (2007) Green roofs as urban ecosystems: Ecological structures, functions, and services. BioScience 57(10):823–833, DOI: https://doi.org/10.1641/B571005
Oberndorfer E, Lundholm J, Bass B, Coffman RR, Doshi H, Dunnett N, Gaffin S, Kohler M, Liu KKY, Rowe B (2007) Green roofs as urban ecosystems: Ecological structures, functions, and services. BioScience 57(10):823–833
Oke TR (1987) Boundary layer climates, Routledge, London, xxi, 372 Parizotto S, Lamberts R (2011) Investigation of green roof thermal performance in temperate climate: A case study of an experimental building in Florianópolis city, Southern Brazil. Energy and Buildings 43(7):1712–1722, DOI: https://doi.org/10.1016/j.enbuild.2011.03.014
Peng LLH, Jim CY (2015) Economic evaluation of green-roof environmental benefits in the context of climate change: The case of Hong Kong. Urban Forestry & Urban Greening 14(3):554–561, DOI: https://doi.org/10.1016/j.ufug.2015.05.006
Peng Z, Stovin V (2017) Independent validation of the SWMM green roof module. Journal of Hydrologic Engineering 22(9):04017037, DOI: https://doi.org/10.1061/(ASCE)HE.1943-5584.0001558
Peng ZJ, Stovin V (2017) Independent validation of the SWMM green roof module. Journal of Hydrologic Engineering 22(9)
Perkins S (2019) Albedo is a simple concept that plays complicated roles in climate and astronomy. Proceedings of the National Academy of Sciences of the United States of America 116(51):25369–25371
Polo-Labarrios MA, Quezada-García S, Sánchez-Mora H, Escobedo-Izquierdo MA, Espinosa-Paredes G (2020) Comparison of thermal performance between green roofs and conventional roofs. Case Studies in Thermal Engineering 21:100697, DOI: https://doi.org/10.1016/j.csite.2020.100697
Prueger JH, Kustas WP (2005) Aerodynamic methods for estimating turbulent fluxes. Micrometeorology in Agricultural Systems U.S. Department of Agriculture: Agricultural Research Service, Lincoln, Nebraska 407–436
Qin X, Wu X, Chiew Y, Li Y (2013) A green roof test bed for stormwater management and reduction of urban heat island effect in Singapore. British Journal of Environment and Climate Change 2:410–420
Schweitzer O, Erell E (2014) Evaluation of the energy performance and irrigation requirements of extensive green roofs in a water-scarce Mediterranean climate. Energy and Buildings 68:25–32, DOI: https://doi.org/10.1016/j.enbuild.2013.09.012
Sfakianaki A, Pagalou E, Pavlou K, Santamouris M, Assimakopoulos MN (2009) Theoretical and experimental analysis of the thermal behaviour of a green roof system installed in two residential buildings in Athens, Greece. International Journal of Energy Research 33(12):1059–1069, DOI: https://doi.org/10.1002/er.1535
Shafique M, Kim R, Rafiq M (2018) Green roof benefits, opportunities and challenges — A review. Renewable and Sustainable Energy Reviews 90:757–773, DOI: https://doi.org/10.1016/j.rser.2018.04.006
Sherrard JA, Jacobs JM (2012) Vegetated roof water-balance model: Experimental and model results. Journal of Hydrologic Engineering 17(8):858–868
Solcerova A, van de Ven F, Wang M, Rijsdijk M, van de Giesen N (2017) Do green roofs cool the air? Building and Environment 111:249–255, DOI: https://doi.org/10.1016/j.buildenv.2016.10.021
Speak AF, Rothwell JJ, Lindley SJ, Smith CL (2012) Urban particulate pollution reduction by four species of green roof vegetation in a UK city. Atmospheric Environment 61:283–293, DOI: https://doi.org/10.1016/j.atmosenv.2012.07.043
Stovin V, Vesuviano G, Kasmin H (2012) The hydrological performance of a green roof test bed under UK climatic conditions. Journal of Hydrology 414–415:148–161, DOI: https://doi.org/10.1016/j.jhydrol.2011.10.022
Stull RB (1988) An introduction to boundary layer meteorology. Kluwer Academic Publishers, Dordrecht; Boston, xii, 666
Tabares-Velasco PC, Srebric J (2011) Experimental quantification of heat and mass transfer process through vegetated roof samples in a new laboratory setup. International Journal of Heat and Mass Transfer 54(25–26):5149–5162
Tang M, Zheng X (2019) Experimental study of the thermal performance of an extensive green roof on sunny summer days. Applied Energy 242:1010–1021, DOI: https://doi.org/10.1016/j.apenergy.2019.03.153
USEPA (2009) Green roofs for stormwater runoff control. United States Environmental Protection Agency
van der Meulen SH (2019) Costs and benefits of green roof types for cities and building owners. Journal of Sustainable Development of Energy, Water and Environment Systems 7(1):57–71, DOI: https://doi.org/10.13044/j.sdewes.d6.0225
VanWoert ND, Rowe DB, Andresen JA, Rugh CL, Fernandez RT, Xiao L (2005) Green roof stormwater retention. Journal of Environmental Quality 34(3):1036–1044, DOI: https://doi.org/10.2134/jeq2004.0364
Vera S, Pinto C, Tabares-Velasco PC, Bustamante W (2018) A critical review of heat and mass transfer in vegetative roof models used in building energy and urban environment simulation tools. Applied Energy 232:752–764, DOI: https://doi.org/10.1016/j.apenergy.2018.09.079
William R, Goodwell A, Richardson M, Le PVV, Kumar P, Stillwell AS (2016) An environmental cost-benefit analysis of alternative green roofing strategies. Ecological Engineering 95:1–9, DOI: https://doi.org/10.1016/j.ecoleng.2016.06.091
Yaghoobian N, Srebric J (2015) Influence of plant coverage on the total green roof energy balance and building energy consumption. Energy and Buildings 103:1–13
Yaglom AM (1977) Comments on wind and temperature flux-profile relationships. Boundary-Layer Meteorology 11(1):89–102, DOI: https://doi.org/10.1007/BF00221826
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This research was supported by K-water as a project for open innovation R&D (20-B-E-006).
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Seo, Y., Kwon, Y., Hwang, J.S. et al. A Comparative Experimental Study of Green Roofs Based on Radiation Budget and Surface Energy Balance. KSCE J Civ Eng 27, 1866–1880 (2023). https://doi.org/10.1007/s12205-023-1491-0
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DOI: https://doi.org/10.1007/s12205-023-1491-0