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Influence of plant and soil layer on energy balance and thermal performance of green roof system

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  • He, Yang
  • Yu, Hang
  • Ozaki, Akihito
  • Dong, Nannan
  • Zheng, Shiling

Abstract

This paper aims to make clear the effects of two important parameters, namely thickness of soil layer and leaf area index of plant layer, on green roof energy and thermal performance. Based on a coupled hygrothermal transfer model validated by field experiments in Shanghai area, energy balance of plant and soil layer is analyzed. Then 18 cases are simulated for different combinations of soil thickness and leaf area index, the results show that soil thickness has a significant effect on long term thermal performance of green roof in both summer and winter, while the effect of leaf area index is only great in summer. Compared with the hypothetical case without evaporation and transpiration, it is found that evaporation of soil layer makes a greater contribution in summer but a less one in winter compared with insulation effect of soil layer. For plant layer, shading is the main cooling way of roof deck while transpiration plays a minor role. Finally, based on the simulation results of long-term thermal performance, two new indexes are proposed to evaluate the relative thermal characteristic of green roof. And the influences of soil thickness, leaf area index and evapotranspiration on the two indexes are analyzed respectively.

Suggested Citation

  • 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.
    • Handle: RePEc:eee:energy:v:141:y:2017:i:c:p:1285-1299
    DOI: 10.1016/j.energy.2017.08.064
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    Cited by:

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    2. Bevilacqua, Piero, 2021. "The effectiveness of green roofs in reducing building energy consumptions across different climates. A summary of literature results," Renewable and Sustainable Energy Reviews, Elsevier, vol. 151(C).
    3. Patryk Antoszewski & Dariusz Świerk & Michał Krzyżaniak, 2020. "Statistical Review of Quality Parameters of Blue-Green Infrastructure Elements Important in Mitigating the Effect of the Urban Heat Island in the Temperate Climate (C) Zone," IJERPH, MDPI, vol. 17(19), pages 1-36, September.
    4. Dimitris Perivoliotis & Iasonas Arvanitis & Anna Tzavali & Vassilios Papakostas & Sophia Kappou & George Andreakos & Angeliki Fotiadi & John A. Paravantis & Manolis Souliotis & Giouli Mihalakakou, 2023. "Sustainable Urban Environment through Green Roofs: A Literature Review with Case Studies," Sustainability, MDPI, vol. 15(22), pages 1-25, November.
    5. Liu Tian & Yongcai Li & Jun Lu & Jue Wang, 2021. "Review on Urban Heat Island in China: Methods, Its Impact on Buildings Energy Demand and Mitigation Strategies," Sustainability, MDPI, vol. 13(2), pages 1-31, January.

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