Simulation of the Thermal Behaviour of a Building Retrofitted with a Green Roof: Optimization of Energy Efficiency with Reference to Italian Climatic Zones

Gargari, Caterina; Bibbiani, Carlo; Fantozzi, Fabio; Campiotti, Carlo Alberto

doi:10.1016/j.aaspro.2016.02.085

Cited by 10 publications

(6 citation statements)

References 5 publications

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“…The condition at the radiation limits is thus considered as an equivalent condition of convection with a nonlinear convective exchange coefficient h = ε•S•T 3 . This factor can be extracted by factorizing by the term (T a − T) in Equation (12).…”

Section: Thermal Model Equationsmentioning

confidence: 99%

“…A comparative study between simulation and experimentation has been held, basing their analysis on, respectively, model identification and spectral analysis. Gargari et al [12] presented in their work a 'public housing' building type simulation to evaluate energy savings generated by the change of insulation materials for external walls while adopting a green roof solution. Results showed that for a building with insulation that responds to restrictive energy regulation, moderate benefits are received from a green roof's integration.…”

Section: Introductionmentioning

confidence: 99%

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3D Modeling of the Thermal Transfer through Precast Buildings Envelopes

2021

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In this paper, a finite-element-based model is being introduced and developed, using the Cast3m (CEA, Paris, France) simulation tool, to evaluate the thermo-mechanical behavior of a small-scale test bed. In fact, many studies on thermal behavior of cavities have been carried out in literature. However, none of them took into account the co-existence of all thermal phenomena (conduction, convection, internal/external radiation). The work presented in this paper presents a thermo-mechanical model, which aims to combine, in a holistic way, these phenomena. An experimental validation of the thermal model has been first carried out using an infrared camera and DS18B20 (Maxim Integrated Products, Dallas, TX, USA) numerical sensors. Results are reported and show the accuracy of the proposed model since both numerical and experimental values of heat transmittance fit together. The main objective is to evaluate heat losses through the walls, by means of heat transmittance calculation, and proposing new functional materials that will help in energy harvesting, as a perspective of this work. As for the mechanical study, it was meant to investigate the distribution of the mechanical stress towards the building envelope submitted to its own weight. Results showed that the stress is uniformly distributed on the lateral walls of the structure as well as on the floor.

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Section: Thermal Model Equationsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

3D Modeling of the Thermal Transfer through Precast Buildings Envelopes

2021

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“…Research into green roofs is relatively recent [1] with only a small proportion of studies focussing on the contribution of green roofs to urban biodiversity [1–3] as the predominant focus is on their mitigating capabilities. These include decreasing the urban heat island effect [4, 5], pollution abatement [6, 7], storm water retention and flood risk prevention [8–11] as well as reduction in energy bills [12, 13].…”

Section: Introductionmentioning

confidence: 99%

Up on the roof and down in the dirt: Differences in substrate properties (SOM, potassium, phosphorus and pH) and their relationships to each other between sedum and wildflower green roofs

McAlister

Rott

2019

PLoS ONE

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In urban areas green roofs provide important environmental advantages in regard to biodiversity, storm water runoff, pollution mitigation and the reduction of the urban heat island effect. There is a paucity of literature comparing different types of green roof substrates and their contributions to ecosystem services or their negative effects. This study investigated if there was a difference between sedum and wildflower green roof substrate properties (soil organic matter (SOM), potassium (K) and phosphorus (P) concentrations and pH values) of 12 green roofs in the city of Brighton & Hove. One hundred substrate samples were collected (50 from sedum roof substrates and 50 from wildflower roof substrates) and substrate properties were investigated using standard protocols. Comparisons were made between substrate characteristics on both types of roof substrate with a series of multiple linear regressions. Sedum roofs displayed significantly higher values of SOM, P and pH. There were significant positive relationships between SOM and K concentrations, SOM and P concentrations, pH and K concentrations and pH and P concentrations on sedum roofs. This study concluded that sedum roof substrates are more favourable for plant water use efficiency and also contained a significantly higher percentage of SOM than wildflower roofs. However, higher concentrations of P in sedum roof substrates may have implications in regard to leachates.

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“…Engenharia Agrícola, Jaboticabal, v.38, n.3, p.334-342, may/jun. 2018 absorption, mitigation of heat island effect, and a sensible contribution to biodiversity and natural landscape (Gargari et al, 2016). In recent studies in Scotland, Emmanuel & Loconsole (2015) predicted that an increase in green space of 20% above the current level could eliminate one third and a half of the expected heat island effect in 2050.…”

Section: Introductionmentioning

confidence: 99%

Green Roof: Simulation of Energy Balance Components in Recife, Pernambuco State, Brazil

et al. 2018

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Green roof is a technology that consists of the use of soil and vegetation installed in the roof of buildings, being a great solution to combat heat islands. Thus, this study aimed to compare micrometeorological changes and their effect on the energy balance of nonvegetated (slab) and vegetated building roofs by means of a simulation model calculated as a function of the reference evapotranspiration (ETo), determined by the Penman-Monteith method. This research was developed between February 1 and September 30, 2016, in the Charles Darwin Building's Parking Garage, Rio Ave Empreendimentos, Recife, PE, Brazil. For this, a weather station was installed on the external building slab. On the slab, sensible, latent, and soil heat fluxes corresponded to 75, 22, and 3%, respectively, of the energy balance. In the simulated green roof, these fluxes reached values of 6, 87, and 7%, respectively. The simulation model allowed determining the energy balance for the green roof, indicating a lower sensible heat flux (69%) and a higher latent heat flux (55%) when compared to those found in the slab.

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Simulation of the Thermal Behaviour of a Building Retrofitted with a Green Roof: Optimization of Energy Efficiency with Reference to Italian Climatic Zones

Cited by 10 publications

References 5 publications

3D Modeling of the Thermal Transfer through Precast Buildings Envelopes

3D Modeling of the Thermal Transfer through Precast Buildings Envelopes

Up on the roof and down in the dirt: Differences in substrate properties (SOM, potassium, phosphorus and pH) and their relationships to each other between sedum and wildflower green roofs

Green Roof: Simulation of Energy Balance Components in Recife, Pernambuco State, Brazil

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