Laminar natural convection in a pitched roof of triangular cross-section: summer day boundary conditions

Asan, Habip; Namli, Lutfu

doi:10.1016/s0378-7788(00)00066-9

Cited by 167 publications

(101 citation statements)

References 9 publications

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“…It is seen in this comparison that the results of this study match on a large scale with the results of Abu-Mulaweh et al [24]. The results of the present study were also verified by comparison with the numerical results of Asan and Namli [25,26]. …”

Section: Model Validationsupporting

confidence: 89%

Thermal Behaviour of the Residential Buildings with Cantilever Beam under Winter Day Boundary Conditions

Namli

2017

Hittite J. Sci. Eng.

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In this study, the thermal behaviour of residential buildings with cantilever beam under winter boundary conditions was numerically investigated by means of the open-ended structure approach. For this purpose, parametric studies were carried out for various ratios of cantilever beam depth/cantilever beam height (d/H) and Rayleigh numbers using a computer program for no wind laminar flow conditions. Analyses were conducted for Rayleigh numbers in the range of 10 3 to 10 6 . The calculations were carried out for the ratios of d/H, namely 0.0, 0.2, 0.4, 0.6, 0.8 and 1.0. The working fluid was treated as air (Pr=0.71). According to the findings, the mean Nu number along with the outer vertical wall (surface L) of the residential building, in general, decreases as d/H increases. This decrease in the mean Nu number is evident for Ra≤10 4 , but it appears to be more pronounced after Ra=10 5 . To have minimum heat loss from a residential building under winter day boundary conditions, it is suggested that the ratio of d/H should be between 0.2 and 0.5.

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Section: Model Validationsupporting

confidence: 89%

Thermal Behaviour of the Residential Buildings with Cantilever Beam under Winter Day Boundary Conditions

Namli

2017

Hittite J. Sci. Eng.

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“…The streamlines at this stage indicate that the centers of the two circulating cells have shifted closer to the inclined surfaces, indicating a strong conduction effect near those boundaries. This phenomenon has been reported previously in Akinsete & Coleman (1982) and Asan & Namli (2000) for the daytime condition with constant heating at the upper surface or constant cooling at the bottom surface.…”

supporting

confidence: 87%

“…This study considered only half of the domain. For the purpose of air conditioning calculations, Asan & Namli (2000) and Kent (2009b) have also reported numerical results for steady, laminar two-dimensional natural convection in a pitched roof of triangular cross-section under the summer day (day-time) boundary conditions. Recently, the transient flow development inside the attic space has been analysed by using scaling analysis with numerical verification by (Saha, 2011a;b;Saha et al, 2010a;Saha, 2008).…”

Section: Introductionmentioning

confidence: 99%

Periodically Forced Natural Convection Through the Roof of an Attic-Shaped Building

Saha¹

2011

Convection and Conduction Heat Transfer

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“…Since the triangular geometry is commonly preferred for roofs (atticspaces) [12][13][14][15][16][17]. But, the study of convection heat transfer in triangular geometry has attained the prominent attention owing to its readily use in the engineering applications.…”

Section: Introductionmentioning

confidence: 99%

Numerical investigation of mixed convection in a lid-driven triangular cavity with a circular cylinder using ANN modeling

Nahak¹,

Triveni²,

Panua³

2017

IJHT

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The study of laminar mixed convection is conducted in an air filled the lid-driven triangular cavity with a static circular cylinder. The circular cylinder is fixed at the center of the triangular cavity whose diameter is varied with respect to the height of the cavity and the variation is shown in terms of aspect ratio (AR = D/H). Sides of the cavity and the cylinder are maintained at uniform temperature whereas the cylinder temperature is considered higher than the walls of the cavity. Finite volume method is adopted to solve the governing equations. The present problem is investigated for different constraint parameters such as moving walls, different geometries of the hot wall, different aspect ratio, Richardson number (Ri) and Grashof number (Gr). The outcomes of the investigation reported that the average Nusselt number is found significant at AR = 1/2, Ri = 0.1 and Gr = 105. An Artificial Neural Network (ANN) tool is employed in the study to validate the obtained numerical results of stream functions and Nusselt number.

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Laminar natural convection in a pitched roof of triangular cross-section: summer day boundary conditions

Cited by 167 publications

References 9 publications

Thermal Behaviour of the Residential Buildings with Cantilever Beam under Winter Day Boundary Conditions

Thermal Behaviour of the Residential Buildings with Cantilever Beam under Winter Day Boundary Conditions

Periodically Forced Natural Convection Through the Roof of an Attic-Shaped Building

Numerical investigation of mixed convection in a lid-driven triangular cavity with a circular cylinder using ANN modeling

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