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Simulation of thermodynamic transmission in green roof ecosystem

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  • He, Hongming
  • Jim, C.Y.

Abstract

Green roofs entail the creation of vegetated space on the top of artificial structures. They can modify the thermal properties of buildings to bring cooling energy conservation and improve human comfort. This study evaluates the thermodynamic transmission in the green roof ecosystem under different vegetation treatments. Our model simulation is based on the traditional Bowen ratio energy balance model (BREBM) and a proposed solar radiation shield effectiveness model (SEM). The BREBM investigates energy absorption of different components of radiation, and the SEM evaluates the radiation shield effects. The proposed model is tested and validated to be efficient to simulate solar energy transmission in green roofs, with some major findings. Firstly, the solar radiation transmission processes might be considered as free vibration motion. Daytime positive heat storage of the green roof is 350–520W·m−2 on an hourly basis. Nighttime or afternoon negative value registers a rather constant magnitude of −60W·m−2. Daily net average is positive around 155–210W·m−2. Secondly, solar radiation vibration is highly correlated with plant structure. The canopy reflectance and transmittance are strongly correlated (R2=0.87). The multi-layer shrub treatment has the highest shield effectiveness (0.34), followed by two-layer groundcover (0.27), and single-layer grass (0.16). Green roof vegetation absorbs and stores large amounts of heat to form an effective thermal buffer against daily temperature fluctuation. Vegetated roofs drastically depress air temperature in comparison with bare ground (control treatment). Finally, the thermodynamic model is relatively simple and efficient for investigating thermodynamic transmission in green roof ecosystem, and it could be developed into a broad solar radiant land cover model.

Suggested Citation

  • He, Hongming & Jim, C.Y., 2010. "Simulation of thermodynamic transmission in green roof ecosystem," Ecological Modelling, Elsevier, vol. 221(24), pages 2949-2958.
    • Handle: RePEc:eee:ecomod:v:221:y:2010:i:24:p:2949-2958
    DOI: 10.1016/j.ecolmodel.2010.09.002
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    References listed on IDEAS

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    1. Zhang, Jingjie & Gurkan, Zeren & Jørgensen, Sven Erik, 2010. "Application of eco-exergy for assessment of ecosystem health and development of structurally dynamic models," Ecological Modelling, Elsevier, vol. 221(4), pages 693-702.
    2. 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.
    3. 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.
    4. Ahmad, Irshad, 2010. "Performance of antisolar insulated roof system," Renewable Energy, Elsevier, vol. 35(1), pages 36-41.
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    Cited by:

    1. He, Yang & Yu, Hang & Ozaki, Akihito & Dong, Nannan & Zheng, Shiling, 2017. "Influence of plant and soil layer on energy balance and thermal performance of green roof system," Energy, Elsevier, vol. 141(C), pages 1285-1299.
    2. Zuzana Koscikova & Vladimir Krivtsov, 2023. "Environmental and Social Benefits of Extensive Green Roofs Applied on Bus Shelters in Edinburgh," Land, MDPI, vol. 12(10), pages 1-24, September.
    3. Chan, A.L.S. & Chow, T.T., 2013. "Evaluation of Overall Thermal Transfer Value (OTTV) for commercial buildings constructed with green roof," Applied Energy, Elsevier, vol. 107(C), pages 10-24.
    4. Saadatian, Omidreza & Sopian, K. & Salleh, E. & Lim, C.H. & Riffat, Safa & Saadatian, Elham & Toudeshki, Arash & Sulaiman, M.Y., 2013. "A review of energy aspects of green roofs," Renewable and Sustainable Energy Reviews, Elsevier, vol. 23(C), pages 155-168.
    5. Miranda, Nicole D. & Renaldi, Renaldi & Khosla, Radhika & McCulloch, Malcolm D., 2021. "Bibliometric analysis and landscape of actors in passive cooling research," Renewable and Sustainable Energy Reviews, Elsevier, vol. 149(C).
    6. Bila, J. & Jura, J. & Pokorny, J. & Bukovsky, I., 2011. "Qualitative modeling and monitoring of selected ecosystem functions," Ecological Modelling, Elsevier, vol. 222(19), pages 3640-3650.
    7. Vera, Sergio & Pinto, Camilo & Tabares-Velasco, Paulo Cesar & Bustamante, Waldo, 2018. "A critical review of heat and mass transfer in vegetative roof models used in building energy and urban enviroment simulation tools," Applied Energy, Elsevier, vol. 232(C), pages 752-764.

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