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On the Existence of Solutions of a Two-Layer Green Roof Mathematical Model

Author

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  • J. Ignacio Tello

    (Department of Fundamental Mathematics, School of Sciences, UNED, 28040 Madrid, Spain)

  • Lourdes Tello

    (Department of Applied Mathematics, ETS Arquitectura, Universidad Politécnica de Madrid, Av. Juan de Herrera 4, 28040 Madrid, Spain)

  • María Luisa Vilar

    (Department of Applied Mathematics, ETS Arquitectura, Universidad Politécnica de Madrid, Av. Juan de Herrera 4, 28040 Madrid, Spain)

Abstract

The aim of this article is to fill part of the existing gap between the mathematical modeling of a green roof and its computational treatment, focusing on the mathematical analysis. We first introduce a two-dimensional mathematical model of the thermal behavior of an extensive green roof based on previous models and secondly we analyze such a system of partial differential equations. The model is based on an energy balance for buildings with vegetation cover and it is presented for general shapes of roofs. The model considers a vegetable layer and the substratum and the energy exchange between them. The unknowns of the problem are the temperature of each layer described by a coupled system of two partial differential equations of parabolic type. The equation modeling the evolution of the temperature of the substratum also considers the change of phase of water described by a maximal monotone graph. The main result of the article is the proof of the existence of solutions of the system which is given in detail by using a regularization of the maximal monotone graph. Appropriate estimates are obtained to pass to the limit in a weak formulation of the problem. The result goes one step further from modeling to validate future numerical results.

Suggested Citation

  • J. Ignacio Tello & Lourdes Tello & María Luisa Vilar, 2020. "On the Existence of Solutions of a Two-Layer Green Roof Mathematical Model," Mathematics, MDPI, vol. 8(9), pages 1-17, September.
  • Handle: RePEc:gam:jmathe:v:8:y:2020:i:9:p:1608-:d:415379
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    References listed on IDEAS

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    1. Jaffal, Issa & Ouldboukhitine, Salah-Eddine & Belarbi, Rafik, 2012. "A comprehensive study of the impact of green roofs on building energy performance," Renewable Energy, Elsevier, vol. 43(C), pages 157-164.
    2. Mansoureh Gholami & Alberto Barbaresi & Patrizia Tassinari & Marco Bovo & Daniele Torreggiani, 2020. "A Comparison of Energy and Thermal Performance of Rooftop Greenhouses and Green Roofs in Mediterranean Climate: A Hygrothermal Assessment in WUFI," Energies, MDPI, vol. 13(8), pages 1-15, April.
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