Attic baffle size and vent configuration impacts on attic ventilation

Iffa, Emishaw; Tariku, Fitsum

doi:10.1016/j.buildenv.2015.01.028

Cited by 16 publications

(4 citation statements)

References 19 publications

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“…For summer conditions, the roof is exposed to sun radiation, different ambient air temperature and convective dissipation, so it is not clear which roof temperature should be used as a boundary condition. For this reason, we compared two cases: a) a prescribed constant roof temperature (CRT), used widely in the literature [5][6][7][8] and b) a prescribed constant solar radiation (CSR) coupled to convective heat exchange with external environment. For both cases, a closed cavity without conection with exterior is used.…”

Section: Model Validationmentioning

confidence: 99%

“…On later papers, Wang and Shen [6,7] employed a 2D unsteady CFD model assuming a mid-plane symmetry to study the impacts of ventilation ratio, vent balance and roof pitch on air flow and heating load of both sealed and vented attic for summer conditions. Recently, Iffa and Tariku [8] studied the effects on temperature profile and airflow patterns inside the cavity by varying the gap size between roof sheathing and ceiling insulation and the location of the vent area under both summer and winter condition. The same authors used transient boundary conditions [9] to study the dynamic response of the roof thermal performance.…”

Section: Introductionmentioning

confidence: 99%

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Impact of Design Parameters on the Natural Ventilation of a Family House Attic From Santa Fe (Argentina)

Berli¹,

Brondino²,

Paolo³

2022

AnAFA

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The roof of a family home introduces important amounts of heat into the house. In Santa Fe city (Argentina), the attic of social family houses is not designed with thermal optimization purposes. In this work, a low Reynolds number k-e turbulent model is computationally implemented to show that a proper selection of constructive parameters of a vented attic leads to a great reduction of the heat transferred from the roof to the ceiling. The main physical consequence of a vented attic is the existence of a convective flow barrier close to the roof that carries important amounts of heat from the attic out to the environment. It is shown that the heat transferred through the ceiling to the interior of the house can be reduced in more than 70 % for summer conditions. Roof pitch and attic volume are also explored.

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Section: Model Validationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Impact of Design Parameters on the Natural Ventilation of a Family House Attic From Santa Fe (Argentina)

Berli¹,

Brondino²,

Paolo³

2022

AnAFA

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“…The results show that changes in the ventilation ratio and vent configuration had little impact on the streamline pattern. Iffa and Tariku [7] discussed how changes in roof sheathing, ceiling insulation (baffle size) and locations of the vent area affect the air and temperature distributions in the attic space in summer and winter. Their results show that when the airflow was driven by wind, increasing the baffle size significantly influenced the air distribution.…”

Section: Introductionmentioning

confidence: 99%

Effects of the Design Parameters of Ridge Vents on Induced Buoyancy-Driven Ventilation

et al. 2022

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With ridge vents that are commonly used in building ventilation applications as the research object, this study analyzed how design parameters affect the efficiency of thermal buoyancy-driven ventilation induced by ridge vents through computational fluid dynamics (CFD). The design parameters of ridge vents include the width S, height H, and eave overhang E. In consideration of engineering practices, the parameter ranges were set as follows: S = 1.2, 1.8, 2.4, and 3 m; H = 0.3, 0.6, 0.9, and 1.2 m; and E = 0, 0.3, and 0.6 m. The results show that when a ridge vent is under buoyancy-driven ventilation, the height H serves as the dominant design parameter. Correlation equations of the induced ventilation rates with the relevant ridge vent design parameters are provided.

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“…In recent years, there has been a considerable amount of experimental and numerical studies devoted to the analysis of the airflow and heat transfer through the attic space under the gable roof (e.g. work of Asadi et al, 2012; Iffa and Tariku, 2015; Medina et al, 1998; Nik et al, 2012; Wang et al, 2012; Winiarski and O’Neal, 1996) and mono-pitched roof (e.g. Haese and Teubner, 2002; Ong, 2011; Wang and Shen, 2012) of residential buildings.…”

Section: Introductionmentioning

confidence: 99%

A model of heat and air transfer in a ventilated, rectangular space

Olenets

Piotrowski

2016

Journal of Building Physics

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This work presents and verifies the model and air transfer in a horizontal, naturally ventilated air cavity that could be under a flat roof or under a building as a crawl space. In this article, this space is represented as a rectangular air channel with a cooled top and heated bottom and walls each either heated or cooled. Temperature of all wall surfaces varies along the attic space length. The model allows estimating temperatures of air and wall surfaces along the channel for a low velocity of airflow in the channel. The results of calculations were compared with a field experiment and agreed within estimated errors of the model, that is, \9%.

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Attic baffle size and vent configuration impacts on attic ventilation

Cited by 16 publications

References 19 publications

Impact of Design Parameters on the Natural Ventilation of a Family House Attic From Santa Fe (Argentina)

Impact of Design Parameters on the Natural Ventilation of a Family House Attic From Santa Fe (Argentina)

Effects of the Design Parameters of Ridge Vents on Induced Buoyancy-Driven Ventilation

A model of heat and air transfer in a ventilated, rectangular space

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