Experimental and numerical investigation of natural convection in a double skin facade

İnan, Tuğba; Başaran, Tahsin; Ezan, Mehmet Akif

doi:10.1016/j.applthermaleng.2016.06.124

Cited by 32 publications

(6 citation statements)

References 19 publications

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“…Saury, Rouger, Djanna, and Penot (2011) presented an experimental work for large Ra numbers in a 4 m-high cavity with a horizontal cross-section equal to 0.86 × 1.00 m 2 (4 • 10 10 ≤ Ra ≤ 1.2 • 10 11 ). İnan, Başaran, and Ezan (2016) numerically and experimentally studied the heat transfer in a rectangular cavity that simulated a double-skin façade and included natural convection. Ra numbers ranging from 8.59 • 10 9 to 1.41 • 10 10 were studied, and a correlation for the Nusselt number was developed.…”

Section: Previous Experimental Work On Vertical Surfacesmentioning

confidence: 99%

New natural convection heat transfer correlations in enclosures for building performance simulation

Rincón-Casado

Flor

Vera

et al. 2017

Engineering Applications of Computational Fluid Mechanics

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This paper presents new correlations to calculate natural convection heat transfer coefficients (CHTC) in enclosures for building performance simulation. Current work related to the development of correlations is not oriented to building enclosures, and the influence of high numbers of Rayleigh (Ra) and aspect ratio on the CHTC has not been studied in detail. In this work, two new correlations have been developed for a vertical wall, one in laminar regime (Ra < 10 7) and another one in turbulent regime (10 7 < Ra < 10 11). Moreover, two new correlations have been developed for floor and ceiling, one in laminar regime (Ra < 10 6) and another one in turbulent regime (Ra > 10 6). All correlations have been developed as function of the aspect ratio (H/L) and Ra numbers calculated from the enclosure average air temperature and wall surface temperature. By contrast, in previous works the Ra numbers have been calculated from the temperature difference of opposite walls. Computer Fluid Dynamics (CFD) simulations for different aspect ratios (H/L = 0.5-1-2) and Ra numbers (10 3-10 11) have been carried out in order to obtain these correlations. The SIMPLE algorithm has been used for the solution of the Navier-Stokes equations and the realizable turbulence k-ε model with an enhanced wall-function treatment has been used. The correlations developed follow the expected trend for the low number of Ra in comparison with the expressions developed by other authors. For a high number of Ra, our correlations improve the previous correlations, because it is a function of the aspect ratio of the enclosure and the average air temperature of the enclosure. This approach is simple to implement in the construction of thermal simulation programs with low computational cost.

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Section: Previous Experimental Work On Vertical Surfacesmentioning

confidence: 99%

New natural convection heat transfer correlations in enclosures for building performance simulation

Rincón-Casado

Flor

Vera

et al. 2017

Engineering Applications of Computational Fluid Mechanics

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“…In recent years, the use of multilayer facades has been widely adopted in the design of modern buildings, and the use of more advanced multilayer facades has been investigated, especially for energy savings. However, even if the energy performance side is improved, there is a great need for additional mechanical air conditioners in terms of indoor microclimatic comfort conditions (Gosselin and Chen 2008, Inan et al 2016, Inan et al 2017, Ioannidis et al 2020. Many studies have explored the potential of combining natural ventilation with multiple facades.…”

Section: Athens Journal Of Technology and Engineeringmentioning

confidence: 99%

Untitled

2022

AJTE

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ATINER is an independent and non-profit Association with a Mission to become a forum where Academics and Researchers from all over the world can meet in Athens, exchange ideas on their research and discuss future developments in their disciplines, as well as engage with professionals from other fields. Athens was chosen because of its long history of academic gatherings, which go back thousands of years to Plato's Academy and Aristotle's Lyceum. Both these historic places are within walking distance from ATINER's downtown offices. Since antiquity, Athens was an open city. In the words of Pericles, Athens"…is open to the world, we never expel a foreigner from learning or seeing". ("Pericles' Funeral Oration", in Thucydides, The History of the Peloponnesian War). It is ATINER's mission to revive the glory of Ancient Athens by inviting the World Academic Community to the city, to learn from each other in an environment of freedom and respect for other people's opinions and beliefs. After all, the free expression of one's opinion formed the basis for the development of democracy, and Athens was its cradle. As it turned out, the Golden Age of Athens was in fact, the Golden Age of the Western Civilization. Education and (Re)searching for the 'truth' are the pillars of any free (democratic) society. This is the reason why Education and Research are the two core words in ATINER's name.

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“…Saury et al [33] presented an experimental work for large Ra numbers in a 4m high cavity with a horizontal cross-section equal to 0.86 × 1.00 m 2 (4×10 10 ≤ Ra ≤ 1.2×10 11 ). Inan et al [34] numerically and experimentally studied the heat transfer in a rectangular cavity. They simulated a double-skin faç ade and included natural convection with 8.59×10 9 ≤Ra≤ 1.41×10 10 , and a correlation for the Nusselt number was developed.…”

Section: Previous Experimental Work On Vertical Surfacesmentioning

confidence: 99%

Analysis of Aspect Ratio Effects of Left Heated 2D Cavity Using Energy Streamlines and Field Synergy Principle

Rani¹,

Narayana²,

Rameshwar³

2019

MMEP

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In the present study natural convective flow of air in a two dimensional cavity with three different aspect ratios (AR) are analyzed using direct numerical simulation. Established open source CFD package OpenFOAM, has been utilized to run the simulation. In this problem, the vertical walls are assumed to be maintained at an isothermal temperature with left vertical wall has high temperature than the right wall and the other walls are assumed to be thermally insulated. The governing equations of this problem are expressed in dimensionless form and are solved by using the finite volume method. For spatial derivatives, the second order upwind linearization technique was used. The CGS method was employed as an effective acceleration means. The divergent and Laplacian terms in the governing equations are discretized by the QUICK and Gauss linear schemes, respectively. The computations are conducted for Rayleigh number until 10 6. An attempt has been made to gather the visualization techniques such as streamlines, isotherms, energy streamlines and field synergy principle to analyse the flow behavior. When Ra is small, vertical energy streamlines appeared, as Ra further increases, free energy streamlines at the boundary are observed whereas trapped energy streamlines at the centre appeared in the horizontal direction. For a fixed Ra, as AR increases, average synergy angle () increases. This result implies that synergy between temperature field and velocity gets worse, which leads to the mild growth rate of ̅̅̅̅. The field synergy principle shows that the improving synergy between the temperature gradient and velocity vector, the heat transfer can be enhanced with less increased flow resistance.

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Experimental and numerical investigation of natural convection in a double skin facade

Cited by 32 publications

References 19 publications

New natural convection heat transfer correlations in enclosures for building performance simulation

New natural convection heat transfer correlations in enclosures for building performance simulation

Untitled

Analysis of Aspect Ratio Effects of Left Heated 2D Cavity Using Energy Streamlines and Field Synergy Principle

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