Thermal effects of an innovative green wall on building energy performance

Djedjig, Rabah; Ganaoui, Mohammed El; Belarbi, Rafik; Bennacer, Rachid

doi:10.1051/meca/2016015

Cited by 20 publications

(12 citation statements)

References 21 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Nevertheless, the authors have only considered one single type of VGS at a time in simulations, and therefore, a comparison among all of the different systems with a unique method is not available. The studies analyzed investigate different areas and types: the trees shading effect [21][22][23][24][25][26][27], the double skin façade with plants [28][29][30][31][32] and the Green Walls [3,8,[33][34][35][36].…”

Section: Literature Reviewmentioning

confidence: 99%

“…The correlation coefficients are close to unity, showing a good match between the simulation results and those of the experimental case. [35] Djedji et al The mathematical model used was developed on the basis of a green roof model, analyzed by the authors in a previous study [42], analyzing solar and infrared radiation, convection and evapotranspiration.…”

Section: Light System (Ls)mentioning

confidence: 99%

See 1 more Smart Citation

Simulating and Comparing Different Vertical Greenery Systems Grouped into Categories Using EnergyPlus

Arenghi

Perra²,

Caffi

2021

Applied Sciences

View full text Add to dashboard Cite

The use of vegetation for the energy efficiency of buildings is an increasingly widespread practice; therefore, the possibility of representing these systems correctly with the use of simulation software is essential. VGS performances have been widely studied, but currently, the lack of a unique simulation method to assess the efficiency of different types of VGS and the absence of studies evaluating the performances of all the systems available, proposing simulation models for each of them, leads to an incomplete energy representation. The aim of this study is to achieve a consistent and complete simulation method, comparing the different systems’ performances. The research is made up of five main steps. Firstly, a classification to group these systems into specific categories was proposed; secondly an in-depth analysis of existing literature was worked out to establish the methods used for different types of VGS. The study of plant physiology allowed the definition of an energy balance, which is valid for all vegetated surfaces; then, each category was associated to a mathematical formula and finally integrated into the EnergyPlus software. The results achieved for each model were compared evaluating two important parameters for the termohygrometric conditions control: outside walls face temperatures and operative temperatures.

show abstract

Section: Literature Reviewmentioning

confidence: 99%

Section: Light System (Ls)mentioning

confidence: 99%

Simulating and Comparing Different Vertical Greenery Systems Grouped into Categories Using EnergyPlus

Arenghi

Perra²,

Caffi

2021

Applied Sciences

View full text Add to dashboard Cite

show abstract

“…Proceedings of SIMS 2020 Virtual, Finland, 22-24 September 2020 eral other authors considered the heat balance of the foliage and heat transfer through the substrate layer of the vertical greenery system and integrated models in building simulation programs like TRNSYS and EnergyPlus (Djedjig et al, 2015(Djedjig et al, , 2017Dahanayake and Chow, 2017). A multilayered model approach for vegetated vertical systems is presented in (Convertino et al, 2019a).…”

Section: Introductionmentioning

confidence: 99%

Numerical analysis of the performance of green façades

Poupart¹,

Martine²,

Christiansen³

et al. 2021

Linköping Electronic Conference Proceedings

View full text Add to dashboard Cite

This study reports a numerical analysis of the performance of green façades in different geographical locations and seasonal conditions. A mathematical model from a previous study is implemented and combined with the modified convective heat transfer coefficients from a recent study of the literature to simulate the transient heat transfer through bare walls and green facades with climbing vegetation. An implicit Finite Difference Method (FDM) based solver is used to perform the numerical simulations. Climate data are taken from relevant weather stations in Oslo and Rome and typical meteorological year (TMY) values are used for this purpose together with variable thermo-physical properties of air. An energy budget analysis reveals that the shortwave radiation term and convective heat transfer term are predominating compared to the other terms involved in the energy balance equation for summer time. The results show that the green walls are most effective in summer seasons with high levels of solar radiation, as most of the cooling effect is credited to the vegetation blocking the solar radiation. In cooler seasons, the benefit is less prominent. Furthermore, an analysis of the effects of the different models of convective heat transfer coefficients is presented.

show abstract

“…While, in winter, they are able to reduce energy demands for heating, by decreasing the wind velocity and by controlling heat losses [3]. in the functioning of vertical greening systems, significative aspects are the wall orientation and the specific characteristics of the greenery system used [13], [18]- [21]. nevertheless, only few studies deal with the long-term thermal performance of these systems useful to assess suitable plant species and systems options [4], [5], [13].…”

mentioning

confidence: 99%

Heat transfer mechanisms in vertical green systems and energy balance equations

Convertino¹,

Vox²,

Schettini³

2019

Int. J. DNE

View full text Add to dashboard Cite

Heat transfer mecHanisms in vertical green systems and energy balance equations f. convertino, g. vox & e. scHettini department of agricultural and environmental science -disaat -university of bari, bari, italy. abstract the use of vegetated vertical systems is a sustainable technology for improving the energy efficiency of buildings in cities in order to reduce the energy consumption for air conditioning in summer and to increase the thermal insulation in winter. increasing urban green infrastructure (ugi) in a city can contribute to improve urban climate in summer reducing buildings surface temperature and urban air especially in southern europe. the application of vertical green systems requires the knowledge of the energy performance of the applied greenery system. the choice of the green facades depends on the local climate, water availability, building shape.the presence of green facades affects the building microclimate all day, by reducing heat waves during the warm periods and heat losses from the building in the cold period.the heat and mass transfer between the external environment, the green facades and the building surface determine the building microclimate. solar radiation, long wave infrared radiation, convective heat transfer and evapotranspiration are the main mechanisms of heat transfer in a green façade.the paper describes the main parameters concerning heat flow in green facades that can be used in simulation models for predicting temperatures in buildings using the external weather conditions as model inputs. the input parameters are: external air temperature and relative humidity, solar radiation, wind velocity and direction, plants and building characteristics. the green facade was described by a schematic representation, four layers were defined: the green layer, the external surface of the building wall, the internal surface of the building wall, the air inside the building.the energy balance was defined for each layer and all the terms involved in the energy exchange between the layers were defined as a function of the plant, the weather conditions and the constructive characteristics of the wall.

show abstract

Thermal effects of an innovative green wall on building energy performance

Cited by 20 publications

References 21 publications

Simulating and Comparing Different Vertical Greenery Systems Grouped into Categories Using EnergyPlus

Simulating and Comparing Different Vertical Greenery Systems Grouped into Categories Using EnergyPlus

Numerical analysis of the performance of green façades

Heat transfer mechanisms in vertical green systems and energy balance equations

Contact Info

Product

Resources

About