Development and validation of a coupled heat and mass transfer model for green roofs

Djedjig, Rabah; Ouldboukhitine, Salah-Eddine; Belarbi, Rafik; Bozonnet, Emmanuel

doi:10.1016/j.icheatmasstransfer.2012.03.024

Cited by 80 publications

(37 citation statements)

References 26 publications

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“…The green roof net heat flux (time-averaged test data) of this study was compared with other researchers published results [1,6,[32][33][34] as shown in Figure 14. All these studies were conducted during the summer months from July to August.…”

Section: Resultsmentioning

confidence: 93%

Experimental Heat Transfer Study on Green Roofs in a Semiarid Climate during Summer

Issa

Leitch

Chang

2015

Journal of Construction Engineering

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An experimental study was conducted on green roofs under the semiarid summer climatic conditions of West Texas to investigate the effect of soil type, moisture content, and the presence of a top soil grass layer on the conductive heat transfer through the roof. Two soil types were investigated: uniform sand and local silt clay. Tests were also conducted on a control roof. A dual-needle heatpulse sensor was used to conduct thermal property tests on the soils. The tests reveal that unlike sand, the thermal conductivity of silt clay did not increase continuously with soil moisture. Better heat transfer conditions were achieved when the sand and silt clay roofs were watered to a water depth of 10 mm per day rather than double the amount of 20 mm per day. The roof with silt clay soil had the lowest fluctuation in inner temperature between daytime and nighttime. Green roofs with silt clay soil required more than twice the amount of soil moisture than green roofs with sand to achieve similar roof heat transfer rates. The best net heat flux gains for vegetated green roofs were 4.7 W/m 2 for the sand roof and 7.8 W/m 2 for the silt clay roof.

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Section: Resultsmentioning

confidence: 93%

Experimental Heat Transfer Study on Green Roofs in a Semiarid Climate during Summer

Issa

Leitch

Chang

2015

Journal of Construction Engineering

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“…A number of case studies have been conducted to demonstrate UHI mitigation benefits. Djedjig (2012) described approaches for modelling green roof heat and mass transfer using partial differential equations to calculate heat balance based on measurement [40]. Mirzaei (2015) reviewed different modelling tools to investigate UHI effects using tools ranging from the building scale (i.e., energyPlus) through to the meso-city scale (i.e., Town Energy Balance Model) [41].…”

Section: Urban Heat Island Effect Mitigation Improving Thermal Comformentioning

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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“…Following a review [28] of green roof models, a new model has been developed to improve the thermo-hydric modeling of the green modules by considering the coupling mechanisms of heat and mass transfer. Modified resistances to heat and vapor transfers have been proposed; taking into account the radiative characteristics, the physiological and the thermophysical properties of the green modules constituents and their change according to the water availability.…”

Section: Model Developmentmentioning

confidence: 99%

“…Hence, it is necessary to develop models able to assess the complex hygrothermal behavior of vegetated envelopes in different climates under various configurations. Several green roof models have been published over the last fifteen years [24][25][26][27][28]. Besides, there are fewer simulation works on the green walls impact on energy performance.…”

Section: Introductionmentioning

confidence: 99%

“…In this paper, an improved model of green envelope, previously developed and compared to experimental studies at the university of la Rochelle [28], is adapted to the building simulation software TRNSYS. The developed model takes into account the major thermal, aeraulic and hydric phenomena and overcomes certain limitations and assumptions of previous modeling approaches that assume quasi-steady state heat transfer and neglect the effect of water transfer on heat transfer.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Analysis of thermal effects of vegetated envelopes: Integration of a validated model in a building energy simulation program

Djedjig

Bozonnet

Belarbi

2015

Energy and Buildings

Self Cite

109

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Development and validation of a coupled heat and mass transfer model for green roofs

Cited by 80 publications

References 26 publications

Experimental Heat Transfer Study on Green Roofs in a Semiarid Climate during Summer

Experimental Heat Transfer Study on Green Roofs in a Semiarid Climate during Summer

Characterisation of Nature-Based Solutions for the Built Environment

Analysis of thermal effects of vegetated envelopes: Integration of a validated model in a building energy simulation program

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