Modelling thermal and humidity transfers within green roof systems: effect of rubber crumbs and volcanic gravel

Kazemi, Mohammad Taghi; Courard, Luc

doi:10.1080/17512549.2020.1858961

Cited by 20 publications

(37 citation statements)

References 70 publications

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“…At building level, a green roof compared to a traditional one increases energy performance and improves the energy efficiency in buildings mainly through three mechanisms [29][30][31]: (i) Control of solar absorption. The presence of vegetation on the external surface improves radiation exchanges and mitigates the fluctuation of temperatures by limiting the risk of summer overheating.…”

Section: Energy-related Effect Of Green Technologiesmentioning

confidence: 99%

Roof-Integrated Green Technologies, Energy Saving and Outdoor Thermal Comfort: Insights from a Case Study in Urban Environment

Mutani¹,

Todeschi²

2021

IJSDP

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Green urban infrastructures have a significant impact on urban climate mitigation, on indoor and outdoor thermal comfort and on energy performance of buildings. In this paper, outdoor thermal comfort conditions and energy saving for space heating and cooling were investigated before and after the use of roof-integrated green technologies. Existing urban energy and climate models and tools were applied to an urban area located in a Turin (Italy). CitySim, ENVI-met and SOLWEIG tools and a GIS-based model were used to evaluate the mean radiant temperature and the thermal comfort of outdoor spaces before and after the use of vegetated roofs and green surfaces such as the predicted mean vote (PMV), the physiological equivalent temperature (PET) and the universal thermal climate index (UTCI). A GIS-based engineering model and CitySim tool were used to evaluate the energy saving and energy independence index for space heating and cooling after the use of green roofs and solar technologies. According to the shape and the suitability of rooftop elaborated with GIS tools, some roofs were identified as potential green roofs other as potential solar roofs for installing solar thermal collectors and photovoltaic panels. According to the results it is possible to confirm that the use of green roofs and urban greenery can decrease the mean radiant temperature until about 10℃ during summer season, improving outdoor thermal comfort conditions and energy savings with a reduction of 12% for space cooling energy consumption.

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Section: Energy-related Effect Of Green Technologiesmentioning

confidence: 99%

Roof-Integrated Green Technologies, Energy Saving and Outdoor Thermal Comfort: Insights from a Case Study in Urban Environment

Mutani¹,

Todeschi²

2021

IJSDP

View full text Add to dashboard Cite

show abstract

“…The decrease in the urban heat island influence is another advantage of green roof systems. Additionally, rainwater runoff can be reduced and delayed when a green roof is used for the rooftops [9,[11][12][13][14].…”

Section: Introductionmentioning

confidence: 99%

“…The green roof classification is dependent on its thickness and its weight. Among nature-based solutions for roofing systems, the extensive green roof has the shallowest depth and the lightest weight and it includes vegetation, substrate, filter, drainage and insulation layers, from top to the bottom [14,15]. The physical properties of materials used for the substrate and drainage layers can noticeably influence the permeability and thermal performance of roofing systems [16].…”

Section: Introductionmentioning

confidence: 99%

“…For the winter period, they suggested to increase the thickness of green roof layers to promote the roofing systems' insulation capacity. Concerning this, Kazemi et al [8,14] showed that due to higher internal temperature during the winter period, the presence of water content in the substrate and drainage layers led to absorption of the internal ceiling temperature, and subsequently caused them to consume more heating loads and energy in cold periods.…”

Section: Introductionmentioning

confidence: 99%

“…In such conditions, the substrate and drainage layers can play a fundamental role in providing heat resistance for rooftops. On the other hand, since the coarse recycled materials have an adequate moisture retention capacity as well as a suitable water passing ability [32,[41][42][43], they have a comparative advantage in providing enough thermal performance for the substrate and drainage layers of green roof systems [8,14], while there are few studies for selecting appropriate coarse recycled materials and assessing their thermal performance for rooftops [14]. Moreover, the heat resistance of a substrate with coarse recycled materials in wet and dry states is required to be evaluated and compared to each other once the media mixtures' moisture content can affect the roofing systems' thermal resistance [8,18].…”

Section: Introductionmentioning

confidence: 99%

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Heat Transfer Measurement within Green Roof with Incinerated Municipal Solid Waste Aggregates

2021

Self Cite

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A green roof is composed of a substrate and drainage layers which are fixed on insulation material and roof structure. The global heat resistance (Rc) within a green roof is affected by the humidity content of the substrate layer in which the coarse recycled materials can be used. Moreover, the utilization of recycled coarse aggregates such as incinerated municipal solid waste aggregate (IMSWA) for the drainage layer would be a promising solution, increasing the recycling of secondary resources and saving natural resources. Therefore, this paper aims to investigate the heat transfer across green roof systems with a drainage layer of IMSWA and a substrate layer including recycled tiles and bricks in wet and dry states according to ISO-conversion method. Based on the results, water easily flows through the IMSWAs with a size of 7 mm. Meanwhile, the Rc-value of the green roof system with the dry substrate (1.26 m2 K/W) was 1.7 times more than that of the green roof system with the unsaturated substrate (0.735 m2 K/W). This means that the presence of air-spaces in the dry substrate provided more heat resistance, positively contributing to heat transfer decrease, which is also dependent on the drainage effect of IMSWA. In addition, the Rc-value of the dry substrate layer was about twice that of IMSWA as the drainage layer. No significant difference was observed between the Rc-values of the unsaturated substrate layer and the IMSWA layer.

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Drainage Layer in Green Roofs: Proposal for the Use of Agricultural Plastic Waste

Cascone

2022

Lecture Notes in Networks and Systems

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Modelling thermal and humidity transfers within green roof systems: effect of rubber crumbs and volcanic gravel

Cited by 20 publications

References 70 publications

Roof-Integrated Green Technologies, Energy Saving and Outdoor Thermal Comfort: Insights from a Case Study in Urban Environment

Roof-Integrated Green Technologies, Energy Saving and Outdoor Thermal Comfort: Insights from a Case Study in Urban Environment

Heat Transfer Measurement within Green Roof with Incinerated Municipal Solid Waste Aggregates

Drainage Layer in Green Roofs: Proposal for the Use of Agricultural Plastic Waste

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