Convective heat transfer in green façade system

Convertino, Fabiana; Vox, Giuliano; Schettini, Evelia

doi:10.1016/j.biosystemseng.2019.10.006

Cited by 29 publications

(12 citation statements)

References 59 publications

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“…Muhammad Haviz 1  , Muhammad Taufik Toha 2 , Riman Sipahutar 3 , Oki Alfernando 4 Salah satu alternatif penghemat energi sekaligus pendingin ruangan pada suatu bangunan adalah Vertical Greenery System (VGS) (Coma et al, 2016). Menurut Wong et al (2010a) dan Convertino et al (2019), VGS merupakan bentuk penghijauan pada dinding bangunan dimana penggunaannya dengan menumbuhkan tanaman merambat pada dinding luar bangunan. Dengan konsep vertical garden, ruang tanam (space) bisa jauh lebih besar dibandingkan dengan taman konvensional, bahkan jumlah tanaman yang dapat ditanam bisa beberapa kali lipatnya, sehingga dapat menambah ruang hijau secara signifikan (Widiastuti et al, 2014).…”

Section: Pendahuluanunclassified

Evaluasi Termal Vertical Greenery System Tipe Green Facade pada Dinding Bangunan

Haviz

Toha

Sipahutar

et al. 2021

JTEP-L

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Increasing of ambient temperature due to global warming has a direct impact on increasing the room temperature. Heat from surrounding is transferred to building wall and room. By installing the Vertical Greenery System (VGS) on the building wall, it can be an alternative for heat absorber and eco-friendly indicator. The aims of this study are to determine the temperature that can be reduced by VGS type Green Façade (GF) and achieve the energy consumption reduction because of GF installation. GF is installed on the building wall, property of Mining Engineering Department, Sriwijaya University, to measure its temperature, then compare it with the temperature on control wall. The results showed that the GF can reduce the room temperature up to 1,2oC, compared to the control wall and the average is 0,3oC. The decrease in average temperature causes a decrease in energy consumption due to the use of air conditioners by 1.56-1.92%. Keywords: global warming, green facade, thermal evaluation, vertical greenery system

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Section: Pendahuluanunclassified

Evaluasi Termal Vertical Greenery System Tipe Green Facade pada Dinding Bangunan

Haviz

Toha

Sipahutar

et al. 2021

JTEP-L

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“…The convective heat transfer coefficient for green wall in the energy balance model (Susorova et al, 2013) is approximated with the same correlation as for bare wall case (h vw ≈ h bw = 10.79 + 4.192V , where V is the air speed at the bare façade). In this work, we intend to explore the other relevant correlations (Deardorff, 1978;Stanghellini, 1987;Morrison Jr and Barfield, 1981;Ayata et al, 2011;Campbell and Norman, 2012;ASHRAE, 2020) as mentioned in the recent work of Convertino et al (Convertino et al, 2019b). The expressions of convective heat transfer coefficients are summarized in Appendix B.…”

Section: Impact Of Convective Heat Transfer Coefficientmentioning

confidence: 99%

“…In this work, we have revisited the model proposed in (Susorova et al, 2013). We aim to implement this green façade model combining the effects of the modified convective heat transfer coefficients presented in the recent work of (Convertino et al, 2019b). The main objective of this work is to investigate the applicability of the aforementioned model and to analyze the performance of the green wall envelope of buildings, for different climate data revealing the possible benefit of employing green façades in buildings.…”

Section: Introductionmentioning

confidence: 99%

Numerical analysis of the performance of green façades

Poupart¹,

Martine²,

Christiansen³

et al. 2021

Linköping Electronic Conference Proceedings

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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.

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“…where: R i,gl and R e,cw (Wm -2 ) are the LWIR radiative energy emitted by the inner side of the GL and by the external surface of the CW, respectively; T i,gl and T e,cw (K) are the temperatures of the inner side of the GL and of the external surface of the CW; ε gl and ρ gl are the leaves emissivity and reflectivity coefficients, respectively, and ρ ws is the reflectivity coefficient of the wall surface. The convective heat flux was calculated as a function of the convective coefficient h gap (Wm -1 K -1 ) [33]:…”

Section: Modelling Of the Heat Fluxes For Bare And Covered Wallmentioning

confidence: 99%

Heat Transfer Modelling in Green Façades

Convertino

2020

WIT Transactions on Ecology and the Environment

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Making green urban environments through the application of the vertical green façades is an interesting new challenge in view of the growing sustainability of cities. Several advantages have been recognized for this type of passive technology. Inhabitants, buildings and cities are all recipients of these benefits. Due to their potential, an in-depth knowledge of the energy functioning of green façades and, consequently, their conscious use has become essential. This study traces a path for the energy analysis and modelling of green façade systems. Heat fluxes were identified and described by using a mathematical methodology and with the support of experimental data. The energy balance approach was followed. The most significant heat and mass transfer mechanisms were deepened and modelled. Convective, radiative and evapotranspirative exchanges were considered. Thanks to this strategy, the surface energy budget at the external building surface was evaluated. A comparison between the energy behaviour of a green façade and that of a bare wall was carried out. A measurement campaign relative to an experimental green façade realized at the University of Bari allowed also the implementation of realistic data. It was observed that the covered wall, behind the vegetation layer, gained 88% less energy than the bare wall during daytime in the summer. The findings demonstrated, with knowledge of the facts, that the green façades applied to buildings provide significant advantages in Mediterranean areas. In perspective, this study could be further developed through the writing of codes for the energy simulation of building equipped with green façades.

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Convective heat transfer in green façade system

Cited by 29 publications

References 59 publications

Evaluasi Termal Vertical Greenery System Tipe Green Facade pada Dinding Bangunan

Evaluasi Termal Vertical Greenery System Tipe Green Facade pada Dinding Bangunan

Numerical analysis of the performance of green façades

Heat Transfer Modelling in Green Façades

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