An updated and expanded set of thermal property data for green roof growing media

Sailor, David J.; Hagos, Meles

doi:10.1016/j.enbuild.2011.05.014

Cited by 93 publications

(65 citation statements)

References 15 publications

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“…The selection of appropriate types and volumes of substrates is necessary to realise the potential benefits of urban green infrastructure for thermal comfort [119][120][121], vegetation performance [119], and sound attenuation [82]. The use of locally available or recycled materials could reduce embedded energy in processing the materials and the consumption of natural materials.…”

Section: Growing Medium and Structural Supporting Infrastructurementioning

confidence: 99%

Characterisation of Nature-Based Solutions for the Built Environment

2017

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Nature has provided humankind with food, fuel, and shelter throughout evolutionary history. However, in contemporary cities, many natural landscapes have become degraded and replaced with impermeable hard surfaces (e.g., roads, paving, car parks and buildings). The reversal of this trend is dynamic, complex and still in its infancy. There are many facets of urban greening initiatives involving multiple benefits, sensitivities and limitations. The aim of this paper is to develop a characterisation method of nature based solutions for designing and retrofitting in the built environment, and to facilitate knowledge transfer between disciplines and for design optimisation. Based on a review of the literature across disciplines, key characteristics could be organised into four groups: policy and community initiatives, multiple benefits assessment, topology, and design options. Challenges and opportunities for developing a characterisation framework to improve the use of nature based solutions in the built environment are discussed.

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Section: Growing Medium and Structural Supporting Infrastructurementioning

confidence: 99%

Characterisation of Nature-Based Solutions for the Built Environment

2017

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“…As far as growing media are concerned, their composition differs from naturally occurring soils [28], they are not homogeneous materials and the water content considerably influences the behavior of the medium [23].…”

Section: Introductionmentioning

confidence: 99%

“…Evaluations are primarily concerned with thermal energy performance and the related positive effects in different ways; in absolute terms, such as the study of single technological solutions installed on specific and experimental sites [15], or by comparing different solutions [2,3,17]. The methodological approaches can be very different, from dynamic energy simulations [17][18][19], to the monitoring of specific experimental sites-in this case, monitored data can be used for model validation [20], or for studying variables related to energy and environmental indoor and outdoor topics [21,22]-to laboratory tests [23][24][25][26].…”

Section: Introductionmentioning

confidence: 99%

Measurement of Thermal Properties of Growing Media for Green Roofs: Assessment of a Laboratory Procedure and Experimental Results

et al. 2017

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While the Italian standard UNI 11235:2015 establishes minimum performance criteria, the thermal resistance of the growing medium of green roofs is not included in national regulations. Instead, thermal transmittance limits for roofs are obtained by referring to other stratigraphic layers. In the absence of specific national and international standards for laboratory calculations of the thermal performance of growing media for green roofs, a multi-year laboratory testing campaign was carried out on 8 samples which aimed to define the thermal resistance reference values of growing media as a function of density and water content. Thermal conductivity varies between 0.046-0.179 W/mK for dry samples as a function of density and between 0.046-0.47 W/mK as a function of moisture content. Defining a reference method, laboratory tests and restitution of the output in performance curves, was based on 108 tests carried out according to and deviating from the standard based on both guarded hot plate and heat flow meter methods. The significance of the results has prompted researchers and industrial partners to engage in further investment and ongoing tests in this area, targeting the definition of a standard laboratory method to be presented worldwide.

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“…Benefits, such as energy saving in the building and reducing the effect of urban heat island are examples of how the GRS alters the balance of energy in the roof (Sailor and Hagos, 2012). In order to quantify the energy savings in the building, equations are needed to describing accurately the heat transfer through the different layers comprising at GRS.…”

Section: Introductionmentioning

confidence: 99%

Comparison of Green Roof Model Predictions with Experimental Data

Quezada–García¹,

Escobedo-Izquierdo²,

Ambriz-García³

et al. 2015

Energy Research Journal

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In this study, the results of a green roof model are presented and compared with experimental data. Good agreement between simulation and experiment were found for different experimental conditions that were carried out in a controlled environment laboratory. The study of green roof heat transfer processes is important because it allows a better thermal design in buildings; the use of urban forest area reduces the urban heat island effect and others improvements such as air purification. Also, with a mathematical model that accurately describes the heat transfer in the green roof it is possible to determine variables such as the local and averaged temperature inside the building and thus obtain the energy savings of a green roof over a conventional one. In this study a mathematical model of heat transfer in a green roof considers that porous materials form some of its layers and that the heat sources are introduced into the model through boundary conditions. In order to validate the mathematical model considering porous materials, the data obtained from the model and laboratory experimental data were compared. The results show that the inclusion of equations considering porous materials, inside the heat transfer model of the green roof, described properly heat transfer processes. Considering porous materials in the green roof model allows including effects due to canopy density, the amount of water contained in the soil layer or penetration of the radiation through the green layer.

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An updated and expanded set of thermal property data for green roof growing media

Cited by 93 publications

References 15 publications

Characterisation of Nature-Based Solutions for the Built Environment

Characterisation of Nature-Based Solutions for the Built Environment

Measurement of Thermal Properties of Growing Media for Green Roofs: Assessment of a Laboratory Procedure and Experimental Results

Comparison of Green Roof Model Predictions with Experimental Data

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