Enhancement of natural ventilation of a novel roof solar chimney with perforated absorber plate for building energy conservation

Lei, Yonggang; Zhang, Kun; Wang, Fei; Wang, Xun

doi:10.1016/j.applthermaleng.2016.06.090

Cited by 53 publications

(15 citation statements)

References 27 publications

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“…Therefore, radiative heat transfer was not modeled and only convective heat transfer inside the air channel was considered. This approach follows the previous works by Khanal and Lei (2012), who studied effects of the reverse flow at the outlet of a chimney and Lei et al (2016), who studied the flow in a roof solar chimney with a perforated absorber plate. Heat loss by conductive heat transfer through the walls was also neglected.…”

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: Introductionmentioning

confidence: 99%

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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“…The fourth research is about passive solar cooling on the one story building with chiller absorber and the combination with solar chimney [8]. This research is another example of how to maximize the performance of solar chimney by putting absorber chiller component.…”

Section: A State Of the Art Outside Indonesiamentioning

confidence: 99%

Potential of Sloped Solar Chimney for the Architectural Development of Sustainable Applied Technology Models for Passive Air Ventilation

Sugini¹,

Mufida²,

Risdiyono³

2021

JDBE

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This paper presents the result of research section for solar chimney (SC) model innovation as a passive cooling strategy. The research is motivated by sustainability issues, especially on the issue of environmental degradation due to uncontrolled use of air conditioning in urban environments. The vertical SC (VSC) model has been tested by the author et al., 2018. Although in general the presence of VSC has a significant effect on room temperature but it turns out that the VSC column height, that is assumed as the main determinant of performance, does not significantly influence [1]. The character of sun altitude in Indonesia is believed to cause the vertical chimney to be ineffective. For this reason, this study tested the Sloped Solar Chimney (SSC) model. The purpose of this study is to test whether: (1) SSC is better than VSC; (2) the sloping chimney thickness and internal chimney height give a difference in SC performance. The SSC model consists of three components: (1) internal vertical chimney inlet; (2) External 30â° slope and (3) external outlets. The test model is made from galvalum. Overall, the research method was carried out in two stages, namely: (1) testing the simulative models by using a software based on empirical data on the context of the urban housing environment being sampled; (2) testing the models in the field. However, only the result of the first stage is presented in this paper. The location of the urban environment of dense housing used as a case study was Jogoyudan, Yogyakarta. The empirical data input consists of 3 groups of houses: on the banks of the river, in the middle of a dense housing and on the edge of a neighborhood road. The modeling software used is CFD analysis. The analysis uses a comparative test statistic with a confidence level of 5%. From the results of the study it is found that SSC caused different thermal qualities in the test model room. The thickness of the sloping chimney also gives a difference in the thermal quality of space. However, this phase of the research has not been able to show significant effects due to the differences in height of the internal chimney.

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“…The absorbed heat is conducted through the cover plate and transferred to the air in the channel. 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].…”

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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Enhancement of natural ventilation of a novel roof solar chimney with perforated absorber plate for building energy conservation

Cited by 53 publications

References 27 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

Potential of Sloped Solar Chimney for the Architectural Development of Sustainable Applied Technology Models for Passive Air Ventilation

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

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