State-of-the-art analysis of the environmental benefits of green roofs

Berardi, Umberto; GhaffarianHoseini, AmirHosein; Ghaffarianhoseini, Amirhosein

doi:10.1016/j.apenergy.2013.10.047

Cited by 645 publications

(434 citation statements)

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“…Deeper green roofs produce lower heat gain and loss, and they often have a better thermal performance (Berardi, 2014). A 10 cm increase in soil thickness increases the thermal resistance of dry clay soil by 0.4 m2 K/W (Wong et al, 2003).…”

Section: Measures For Reducing Ghg Emissions From Buildingsmentioning

confidence: 99%

“…Similarly, Saiz et al affirmed ''the key property of a green roof is its low solar absorptance ( Saiz, 2006). Several studies stressed the advantages for urban hydrology, storm water quality, and ecological habitats for wildlife [26].Deeper green roofs produce lower heat gain and loss, and they often have a better thermal 9 performance (Berardi, 2014). A 10 cm increase in soil thickness increases the thermal resistance of dry clay soil by 0.4 m2 K/W (Wong et al, 2003).…”

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confidence: 99%

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Review of sustainability in buildings

Abdellatif

Al-Shamma’a

2015

Sustainable Cities and Society

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Review of sustainability in buildingshttp://researchonline.ljmu.ac.uk/2205/ Article LJMU has developed LJMU Research Online for users to access the research output of the University more effectively. Copyright © and Moral Rights for the papers on this site are retained by the individual authors and/or other copyright owners. Users may download and/or print one copy of any article(s) in LJMU Research Online to facilitate their private study or for non-commercial research. You may not engage in further distribution of the material or use it for any profit-making activities or any commercial gain.The version presented here may differ from the published version or from the version of the record. Please see the repository URL above for details on accessing the published version and note that access may require a subscription. AbstractAt present, It is estimated that the building sector contributes up to 45% of annual greenhouse gas emissions primarily through the use of fossil fuels during their operational phase and consumes up to 40% of all energy in UK. Given the massive growth in new construction in economies in transition, and the inefficiencies of existing building stock, if nothing is done, greenhouse gas emissions from buildings will be more than double in the next 20 years. This is a review paper describe the extent and nature of sustainable buildings in UK, either within new or refurbishing old ones, in order to move away from traditional methods of construction and to look at multi-disciplinary and integrated approaches, as well as end-user perspectives.Key words: Built environment, climate change, energy-efficient buildings, GHG emissions. IntroductionToday, it is widely accepted that human activities are contributing to climate change. The Investing in achieving such results in the building sector also has the potential to boost the local economy and improve living conditions. Given the UK's commitment to cut GHG emissions by at least 80% by 2050 relative to 1990 levels, the government recently updated the details of its strategy and milestones for the next five years in its Carbon Plan. Energy efficiency measures in the UK have historically been primarily delivered by government-backed schemes and supplier obligation programmes (which set targets for energy suppliers) (Mallaburn & Eyre, 2014;Rosenow, 2012). However, to deliver projected energy efficiency measures in the future, the UK government has proposed a combination of market-based and government-regulated interventions, under the 'Green Deal' , the 'Energy Company Obligation' (DECC, 2012a) and 'Renewable Heat 3 Incentive (RHI)' . These schemes are designed to help people make energy efficiency improvements to buildings by allowing them to pay the costs through their energy bills rather than upfront. Research Problem and MethodThis study takes a brief look at the concept of sustainability in existing UK building through the review of relevant literature. It is aiming to present sustainable measures and to investigate how these measures would cont...

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Section: Measures For Reducing Ghg Emissions From Buildingsmentioning

confidence: 99%

mentioning

confidence: 99%

Review of sustainability in buildings

Abdellatif

Al-Shamma’a

2015

Sustainable Cities and Society

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“…For example, in the review of the state of the art about the green roofs theme (BE-RARDI et al [1]) it is noticed that they can contribute to reduce the urban heat islands, to mitigate the air pollution, to decrease the flux of pluvial water in the urban drainage systems, to lessen the noises and to increase the biodiversity, amongst other things. In regards to the classification of the green roofs, the main consolidated attributes in the literature (BERARDI et al [1]) are featured for the extensive type, which corresponds to the lightest system, with maximum overload limited to 150 kg/m², which uses small plants and has a facilitated construction process as well as simplified maintenance, with little need for irrigation, having a low execution cost. As for the materials used in the development of the green roofs the highlight is that they are coherent with the proposal of environmental sustainability.…”

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

“…From that perspective, the green roofs in the buildings have been manifesting not only as an effective alternative for the reduction of the energy consumption in the buildings (BERARDI et al [1]) for the cooling of hot weather indoor environments, but also in many aspects related to the environmental sustainability. For example, in the review of the state of the art about the green roofs theme (BE-RARDI et al [1]) it is noticed that they can contribute to reduce the urban heat islands, to mitigate the air pollution, to decrease the flux of pluvial water in the urban drainage systems, to lessen the noises and to increase the biodiversity, amongst other things. In regards to the classification of the green roofs, the main consolidated attributes in the literature (BERARDI et al [1]) are featured for the extensive type, which corresponds to the lightest system, with maximum overload limited to 150 kg/m², which uses small plants and has a facilitated construction process as well as simplified maintenance, with little need for irrigation, having a low execution cost.…”

Section: Introductionmentioning

confidence: 99%

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Cement blocks with EVA waste for extensive modular green roof: contribution of the components for thermal insulation

Melo

Mendonça

2017

Rev. IBRACON Estrut. Mater.

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ResumoVegetated roofs can contribute to the quality of the environment in many ways, especially in the reduction of heat transfer to the internal environment of buildings. Among the techniques available to execute this kind of coverage, the use of cemented lightweight blocks is proposed to be compatible with the extensive modular green roof system. For cemented lightweight blocks that are produced with aggregates of EVA (waste from footwear industries), an additional contribution of thermal insulation capacity of the proposed green roof is expected. This article aims to demonstrate such contribution through measurements performed on prototypes in hot and humid weather conditions. After characterizing the thermal insulation capacity of the proposed green roof with reference to different types of conventional coverage, the additional contribution of the component used in this green roof was identified by making comparisons with measurements collected from another green roof that was executed with cement blocks without the presence of EVA aggregates. In these experiments, external and internal surface temperatures were collected in the coverage of each prototype as well as the air temperatures in the external and internal environments. From the analysis of data for a typical summer day, it was possible to confirm that the proposed green roof presented the lowest thermal amplitudes, considering air and surface temperatures. The presence of aggregates of EVA in the proposed blocks contributed to the reduction of internal temperatures.Keywords: extensive green roof, thermal behavior, EVA residue, cement block.As coberturas vegetadas podem contribuir de várias maneiras na qualidade do meio ambiente, sendo destacada a redução na transferência de calor para os ambientes internos das edificações. Dentre as técnicas disponíveis para execução desse tipo de cobertura propõe-se o uso de blocos cimentícios leves compatíveis com o sistema de telhado verde extensivo modular. Para os blocos cimentícios leves, produzidos com agregados de EVA (resíduos da indústria de calçados), espera-se uma contribuição adicional na capacidade de isolamento térmico do telhado verde proposto. No presente artigo, pretende-se demonstrar tal contribuição, através de medições realizadas em protótipos na condição de clima quente e úmido. Após caracterizar a capacidade de isolamento térmico do telhado verde proposto, tendo como referência diferentes tipos de coberturas convencionais, foi identificada a contribuição adicional do componente utilizado nesse telhado verde, fazendo comparações com medições coletadas em outro telhado verde, executado com blocos cimentícios sem a presença dos agregados de EVA. Nos experimentos, foram coletadas temperaturas superficiais externas e internas em cada cobertura dos protótipos, bem como as temperaturas do ar nos ambientes externo e interno. A partir da análise dos dados para o dia típico de verão foi possível confirmar que o telhado verde proposto apresentou as mais baixas amplitudes térmicas, considerando ...

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How do green roofs mitigate urban thermal stress under heat waves?

Sun

Grimmond

2016

JGR Atmospheres

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As the climate warms, heat waves (HWs) are projected to be more intense and to last longer, with serious implications for public health. Urban residents face higher health risks because urban heat islands exacerbate HW conditions. One strategy to mitigate negative impacts of urban thermal stress is the installation of green roofs (GRs) given their evaporative cooling effect. However, the effectiveness of GRs and the mechanisms by which they have an effect at the scale of entire cities are still largely unknown. The Greater Beijing Region is modeled for a HW scenario with the Weather Research and Forecasting model coupled with a state‐of‐the‐art urban canopy model (Princeton Urban Canopy Model) to examine the effectiveness of GRs. The results suggest that GR would decrease near‐surface air temperature (ΔT2max = 2.5 K) and wind speed (ΔUV10max = 1.0 m s−1) but increase atmospheric humidity (ΔQ2max = 1.3 g kg−1). GRs are simulated to lessen the overall thermal stress as indicated by apparent temperature (ΔAT2max = 1.7°C). The modifications by GRs scale almost linearly with the fraction of the surface they cover. Investigation of the surface‐atmosphere interactions indicates that GRs with plentiful soil moisture dissipate more of the surface energy as latent heat flux and subsequently inhibit the development of the daytime planetary boundary layer (PBL). This causes the atmospheric heating through entrainment at the PBL top to be decreased. Additionally, urban GRs modify regional circulation regimes leading to decreased advective heating under HW.

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State-of-the-art analysis of the environmental benefits of green roofs

Cited by 645 publications

References 125 publications

Review of sustainability in buildings

Review of sustainability in buildings

Cement blocks with EVA waste for extensive modular green roof: contribution of the components for thermal insulation

How do green roofs mitigate urban thermal stress under heat waves?

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