Heat transfer and mass flow correlations for ventilated facades

Suárez, Christian; Joubert, Patrice; Molina, José Luis Malo de; Sánchez, Francisco José Sarabia

doi:10.1016/j.enbuild.2011.10.002

Cited by 32 publications

(10 citation statements)

References 21 publications

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“…Passive systems based on buoyant flows developing in heated vertical or inclined channels are used in many engineering applications such as solar chimneys, photovoltaic cooling systems, or devices for air conditioning and natural ventilation in buildings. Recent papers can be found in the literature for such configurations, as well from an experimental (Chami and Zoughaib, 2010;Popa et al, 2012) than for an analytical or numerical point of view (Bassiouny and Korah, 2009;Suárez et al, 2011), in continuation of numerous previous works during the last decades. (Elenbaas, 1942) pioneered the experimental investigation of natural convection of air within a vertical parallel-plate channels and identified the different types of flows regimes, according to the definition of a modified Rayleigh number.…”

Section: Introductionmentioning

confidence: 72%

Numerical Investigation Of Natural Convection In An Asymmetrically Heated Inclined Channel-chimney Systems. Importance Of The Choice Of Artificial Inlet-outlet Boundary Conditions

Brangeon¹,

Joubert²,

Bastide³

2013

Building Simulation Conference Proceedings

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The present paper is concerned with the results of the numerical investigation of unsteady laminar, natural convection in an asymmetrically heated inclined open channel (i = 0, 45, 60 and 75 • ) with walls at uniform heat flux (q w = 10, 50, 75 and 100W • m −2 ). Two methodological approaches have been adopted to investigate the air flow in this case: 2D and 3D DNS, and four sets of inlet-outlet velocity-pressure boundary conditions have been considered. Significant differences are observed in the flow dynamics between 2D and 3D results. The numerical results are compared with the experimental data and a good agreement is obtained when a local pressure boundary condition is applied at the inlet/outlet sections in the 3D case. A generalized correlation for the average Nusselt number is then obtained from numerical results. This correlation covers a wide range of the Rayleigh number and aspect ratio values (Ra H varying from 5.89 × 10 9 to 5.89 × 10 10 and 6.5 < H/b < 12.8).

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Section: Introductionmentioning

confidence: 72%

Numerical Investigation Of Natural Convection In An Asymmetrically Heated Inclined Channel-chimney Systems. Importance Of The Choice Of Artificial Inlet-outlet Boundary Conditions

Brangeon¹,

Joubert²,

Bastide³

2013

Building Simulation Conference Proceedings

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“…The hot wall and overall channel average Nusselt number correlations were used in a heat balance to determine the cold wall average Nusselt number correlation. Suárez et al (2011) also studied the heat flux for each channel wall separately using a numerical model. They were also interested in obtaining the mass flow rate because of its application to determine the performance of open ventilated facades.…”

Section: Natural Convection In a Heated Vertical Channelmentioning

confidence: 99%

Experimental and Numerical Study of Free Convection in a Vertical Channel with Opposing Buoyancy Forces

Roeleveld¹

2021

Preprint

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Free convective heat transfer inside a vertical channel was studied both experimentally and numerically. An experimental model of an isothermally, asymmetrically heated vertical channel was constructed to study various cases of opposing buoyancy forces. Many studies in the literature have investigated buoyancy forces in a single direction. The study presented here investigated opposing buoyancy forces, where one wall is warmer than the ambient and the other wall is cooler than the ambient. Five different temperature ratios were studied using four different channel spacings between the two channel walls. A Mach-Zehnder interferometer provided temperature field visualization. In addition, local and average heat transfer measurements were made with the interferometer. Flow visualization was conducted to determine the flow pattern inside the channel. The measured local and average Nusselt number data were compared to numerical solutions obtained using ANSYS FLUENT. A steady laminar model and a steady k-ε turbulence model with two different wall functions were used. Numerical solutions were obtained for a Prandtl number of 0.71 and Rayleigh numbers ranging from the laminar fully developed flow regime to the turbulent isolated boundary layer regime.

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“…This study also records the impact of different computational domain sizes on the simulation results. Suárez et al (2011) carried out research on heat transfer and mass flow phenomena in ventilated facades. The aim of this study was to obtain accurate results in terms of correlations for the average Nusselt number and for the mass flow induced in the cavity.…”

Section: Introductionmentioning

confidence: 99%

CFD assessment of a solar honeycomb (SHC) façade element with integrated PV cells

et al. 2015

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Heat transfer and mass flow correlations for ventilated facades

Cited by 32 publications

References 21 publications

Numerical Investigation Of Natural Convection In An Asymmetrically Heated Inclined Channel-chimney Systems. Importance Of The Choice Of Artificial Inlet-outlet Boundary Conditions

Numerical Investigation Of Natural Convection In An Asymmetrically Heated Inclined Channel-chimney Systems. Importance Of The Choice Of Artificial Inlet-outlet Boundary Conditions

Experimental and Numerical Study of Free Convection in a Vertical Channel with Opposing Buoyancy Forces

CFD assessment of a solar honeycomb (SHC) façade element with integrated PV cells

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