Numerical study of the optimum width of 2a diurnal double air-channel solar chimney

Zavala-Guillén, I.; Xamán, J.; Hernández-Pérez, I.; Hernández-López, I.; Gijón-Rivera, M.; Chávez, Y.

doi:10.1016/j.energy.2017.12.147

Cited by 42 publications

(26 citation statements)

References 30 publications

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“…The turbulent stress u i u j and turbulent heat flux T 0 u j were determined with a turbulent closure model. Previous studies (Gan, 2010;Zamora and Kaiser, 2009;Zavala-Guille´n et al, 2018) showed that typical RANS turbulence models such as standard k À v, k À e, renormalization group (RNG) k À e can be employed successfully for this problem. In this study, the RNG k À e model (Yakhot and Orszag, 1986) was selected.…”

Section: Methodsmentioning

confidence: 99%

“…As this study was focused on fluid mechanical effects of nearby walls on the natural convective flow in a solar chimney, we have not considered transmission of solar radiation into the chimney which will fully describe performance of a chimney in practical designs and in real weather conditions. Adding a model for solar transmission complicates the problem further and usually requires an analytical model coupled with the CFD computation (Harris and Helwig, 2007;Zavala-Guille´n et al, 2018). Therefore, radiative heat transfer was not modeled and only convective heat transfer inside the air channel was considered.…”

Section: Methodsmentioning

confidence: 99%

“…With the extension of the computational domain from the air channel of the chimney, turbulence intensity of the airflow entering and leaving the domain was assumed to be small. It was set to 2.0% on the air boundaries, as suggested by Zamora and Kaiser (2009) and Zavala-Guille´n et al (2018).…”

Section: Methodsmentioning

confidence: 99%

“…Solar chimneys have been studied in various configurations, such as vertical and inclined air channels (Adam et al, 2002;Bansal et al, 2005;Burek and Habeb, 2007;Chen et al, 2003;Gan, 2010;Khanal and Lei, 2012;Mathur et al, 2006), vertical air channel with horizontal inlet (Zamora and Kaiser, 2009), vertical doubleair channel (Lei et al, 2016;Zavala-Guille´n et al, 2018), or vertical and horizontal air channels connected serially (AboulNaga and Abdrabboh, 2000).…”

Section: Introductionmentioning

confidence: 99%

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Effects of wall proximity on the airflow in a vertical solar chimney for natural ventilation of dwellings

Nguyen

Wells

2020

Journal of Building Physics

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This study investigates performance of a vertical solar chimney, which absorbs solar energy and induces airflow for natural ventilation and cooling of dwellings, under effects of walls neighboring to its air channel. A computational fluid dynamics model was developed to predict induced flow rate and thermal efficiency of a vertical solar chimney with four types of nearby walls: a vertical wall to which the solar chimney was attached, a horizontal plate above the outlet of the air channel, a horizontal plate, and a horizontal wall below the inlet of the air channel. Examined factors included the heat flux in the air channel, the chimney height, the air gap, the distance of the walls, and the location of the heat source in the air channel. The results showed that effects of the wall proximity were modulated by the location of the heat source and the ratio G/ H between the air gap and the chimney height. Particularly, performance of the chimney was enhanced when the heat source was on the opposite side of the vertical wall and when G/ H was large.

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Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Effects of wall proximity on the airflow in a vertical solar chimney for natural ventilation of dwellings

Nguyen

Wells

2020

Journal of Building Physics

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“…When integrated into a building, solar chimneys can have different forms, including Trombe wall [12], roof-top solar chimney [13], or combined wall and roof solar chimney [14]. Many factors influence the ventilation performance of a solar chimney [3], [15]- [17]. Major ones include geometries of the air channel and the wall, such as the height and the gap of the air channel; material of the walls of the air channel; and weather conditions, such as solar radiation [3], [15]- [17].…”

Section: Introductionmentioning

confidence: 99%

Modifications of Heat Transfer and Induced Flow Rate of a Solar Chimney by an Obstacle in the Air Channel

Nguyen¹,

Huynh²,

Pham³

2021

Int. J. Adv. Sci. Eng. Inf. Technol.

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Using renewable energy resources in buildings has been increasing for saving energy. Among widely used methods, solar chimneys absorb solar radiation and induce an airflow for ventilation, heating, or cooling buildings. The performance of a solar chimney depends on the heat transfer in its air channel, which can be modified by changing the shape of the heat exchange surface. In this study, we examine the effects of a rectangular obstacle placed on the heated surface of the air channel of a solar chimney. A numerical model was built with the Computational Fluid Dynamics (CFD) technique. By changing the geometries of the chimney and of the obstacle, and location of the obstacle, it was found that the obstacle had strong effects on the local flow and heat transfer properties close to the object, particularly the Nusselt number and the temperature field. However, average quantities of the whole air channel flow, such as the averaged Nusselt number and the induced flow rate, were modified insignificantly, except for the temperature rise through the chimney and the thermal efficiency. The change of the flow rate and the average Nusselt number was 5.0% while the temperature rises and the thermal efficiency was up to 13.0%. The height of the obstacle had more influence than the length. This study suggests more investigations to achieve the objective of enhancing the induced flow rate for ventilation of buildings with an obstacle in the air channel of a solar chimney.

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Shi,

Zhang

2024

Green Energy and Technology

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Numerical study of the optimum width of 2a diurnal double air-channel solar chimney

Cited by 42 publications

References 30 publications

Effects of wall proximity on the airflow in a vertical solar chimney for natural ventilation of dwellings

Effects of wall proximity on the airflow in a vertical solar chimney for natural ventilation of dwellings

Modifications of Heat Transfer and Induced Flow Rate of a Solar Chimney by an Obstacle in the Air Channel

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