Attenuating heat stress through green roof and green wall retrofit

Feitosa, Renato Castiglia; Wilkinson, Sara

doi:10.1016/j.buildenv.2018.05.034

Cited by 70 publications

(13 citation statements)

References 43 publications

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“…If, on the one hand, the internal temperatures of the buildings can be set lower, the same cannot be done for the external environment, with the exception of countermeasures finalized for the reduction in UHI effects. Furthermore, the high temperatures that occur in cities during the warmer months can involve substantial and damaging effects on daily life [4][5][6][7].…”

Section: Introductionmentioning

confidence: 99%

Experimental Evaluation and Numerical Simulation of the Thermal Performance of a Green Roof

et al. 2020

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In the building sector, both passive and active systems are essential for achieving a high-energy performance. Considering passive solutions, green roofs represent a sustainable answer, allowing buildings to reach energy savings, and also reducing the collateral effect of the Urban Heat Island (UHI) phenomenon. In this study, a roof-lawn system was investigated by means of an extended measurement campaign, monitoring the heat transfer across the roof. Heat-flow meters and air- and surface-temperature probes were applied in a real building, in order to compare the performance of the roof-lawn system with a conventional roof. This experimental approach was followed to quantify the different thermal behaviors of the building components. Moreover, an equivalent thermal model of the roof-lawn system was studied, in order to obtain the equivalent thermal properties of the roof, useful for setting building models for yearly energy simulations. The roof-lawn system revealed its advantages, showing a higher thermal inertia with no overheating in summertime and a lower thermal transmittance with energy savings in wintertime, and, consequently, better indoor conditions for the occupants of the building.

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Section: Introductionmentioning

confidence: 99%

Experimental Evaluation and Numerical Simulation of the Thermal Performance of a Green Roof

et al. 2020

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“…At building scale, green roofs reduce the sensible heat flux due to the cooling effect [15,16] thus decreasing the heating and cooling demand of a building [17][18][19], and improving human thermal comfort [20,21]. This effect may vary depending on the climate conditions [22][23][24], and the level of insulation specially in cases of building retrofitting [25,26]. Most of these multiple benefits are linked to the cooling effect due to the evapotranspiration process (ET) that humidifies the external ambient air, reduces the surface temperature of the roof [27], and mitigates the urban heat island phenomenon [28].…”

Section: Introductionmentioning

confidence: 99%

The evapotranspiration process in green roofs: A review

Cascone

Coma

Gagliano

et al. 2019

Building and Environment

165

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Previous research has shown that most of the green roof benefits are related to the cooling effect. In the literature available, however, it is still not clear how and how much the evapotranspiration affects the performance of a green roof. In order to fill the gap in this research topic, this study carries out a review on the cooling effect due to the evapotranspiration process of green roofs. First of all, an overview of the evapotranspiration phenomenon in green roofs, as well as the equipment and methods used for its measurement are presented. Then, the main experimental results available in literature, the physicalmathematical models and the dynamic simulation software used for the evaluation of the latent heat flux are also analysed and discussed among the available literature. Moreover, this review proposes a classification of the results carried out by previous studies as function of the main parameters affecting the evapotranspiration process (e.g. volumetric water content, stomatal resistance, Leaf Area Index, solar radiation, wind velocity, relative humidity, soil thickness, and substrate composition). Additionally, a sensitivity analysis of the results obtained from the literature allowed underlining the correlation among the main factors affecting the evapotranspiration. Finally, a vision of the world area where green roof studies were performed is provided. From the results, it is possible to emphasize that most of the studies that evaluated the evapotranspiration used high precision load cells. Furthermore, all the heat transfer models of green roofs considered in this review took into account the latent heat flux due to evaporation of water from the substrate and plants transpiration, however, only few of them were experimentally validated.

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“…Research on GRs has been carried out in Brazil, Colombia and Ecuador. In Brazil, the studies of Castiglia and Wilkinson [23,24] and Parizotto and Lamberts [25] assessed GRs' thermal and hydrological performance using different substrates depths, whereas Noya et al [26] focused on the relative capacity of different substrate compositions to maintain native herbaceous perennial and succulent species. In Ecuador, Jaramillo et al [27] obtained a broad list of potential native plant species for GRs in Quito using a combined approach of habitat templates and climatic envelopes, recommending the grass (Eragrostis lucida), herbs (Plantago sericea) and shrubs (Lantana canescens).…”

Section: Introductionmentioning

confidence: 99%

Green Roof Design with Engineered Extensive Substrates and Native Species to Evaluate Stormwater Runoff and Plant Establishment in a Neotropical Mountain Climate

et al. 2020

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Green roofs are increasingly being implemented in cities for their multiple environmental benefits. Their optimal design requires an appropriate selection of components, including substrates and plant species, to ensure local sustainability in the long term. The present study seeks to assess the runoff quality and quantity of extensive green roofs located in Bogotá (Colombia). The assessment consists of testing different substrates, designed using locally available constituents and a selection of native species. The best performing substrate mixtures, in terms of runoff volume reduction and plant establishment, were jointly evaluated with three native species (i.e., Paepalanthus alpinus, Achryrocline bogotensis and Echeveria ballsii). On average, engineered substrates presented significantly lower concentrations in several water quality parameters (electric conductivity, total phosphorus, phosphates, Total Kjeldahl Nitrogen, nitrates, nitrites, color, biological oxygen demand and chemical oxygen demand) than the commercial extensive substrate used as control. The species Paepalanthus alpinus and Echeveria ballsii showed significant establishment and were considered potentially suitable species for green roofs in Bogotá. The obtained results, therefore, provide recommendations for green roof design in neotropical mountain climate conditions.

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Attenuating heat stress through green roof and green wall retrofit

Cited by 70 publications

References 43 publications

Experimental Evaluation and Numerical Simulation of the Thermal Performance of a Green Roof

Experimental Evaluation and Numerical Simulation of the Thermal Performance of a Green Roof

The evapotranspiration process in green roofs: A review

Green Roof Design with Engineered Extensive Substrates and Native Species to Evaluate Stormwater Runoff and Plant Establishment in a Neotropical Mountain Climate

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