Numerical analysis of the performance of a venturi-shaped roof for natural ventilation: Influence of building width

Hooff, van Taj Twan; Blocken, Bje Bert; Aanen, L.; Bronsema, B

doi:10.1016/j.jweia.2012.02.013

Cited by 26 publications

(6 citation statements)

References 19 publications

(20 reference statements)

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“…The simulations for the grid‐sensitivity analysis showed oscillatory convergence, comparable with that reported by Ramponi and Blocken () and van Hooff et al. (). The oscillations resulted in small fluctuations of the velocity, mainly in the wall jet region, which were within 2 and 5% of the average velocity at a given point for the two‐equation models and the RSM model, respectively.…”

Section: Cfd Simulationssupporting

confidence: 88%

“…Note that these differences are mainly present in the shear layer and boundary layer regions. The simulations for the grid-sensitivity analysis showed oscillatory convergence, comparable with that reported by Ramponi and Blocken (2012) and van Hooff et al (2012c). The oscillations resulted in small fluctuations of the velocity, mainly in the wall jet region, which were within 2 and 5% of the average velocity at a given point for the two-equation models , and taking into account the oscillatory convergence that was present, the middle grid was considered to provide fairly grid-independent results and is therefore used in the remainder of this study.…”

Section: Computational Geometry and Gridsupporting

confidence: 85%

“…For the majority of the simulations, oscillatory convergence was present. As discussed in Ramponi and Blocken (2012) and van Hooff et al (2012c), CFD simulations can exhibit oscillatory unsteadiness of the flow field, resulting in fluctuating values of the studied parameters as a function of the number of iterations. Solely looking at the residuals is therefore not enough and might even be misleading.…”

Section: Solver Settingsmentioning

confidence: 99%

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On the suitability of steady RANS CFD for forced mixing ventilation at transitional slot Reynolds numbers

2012

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This article presents a detailed numerical study of isothermal forced mixing ventilation driven by a low-velocity (transitional) wall jet using steady computational fluid dynamics (CFD) simulations. It is shown that the numerically obtained room airflow patterns are highly dependent on the chosen turbulence model and large differences with experimentally obtained velocity fields can be present. The renormalization group (RNG) k-ε model, which is commonly used for room airflow modeling, shows the largest deviations from the measured velocities, indicating the care that must be taken when selecting a turbulence model for room airflow prediction. As a result of the different predictions of the flow pattern in the room, large differences are present between the predicted air exchange efficiency obtained with the four tested turbulence models, which can be as high as 44%.

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Section: Cfd Simulationssupporting

confidence: 88%

Section: Computational Geometry and Gridsupporting

confidence: 85%

Section: Solver Settingsmentioning

confidence: 99%

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On the suitability of steady RANS CFD for forced mixing ventilation at transitional slot Reynolds numbers

2012

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“…Ameer et al [37], inspired by the venturi effect, designed a narrow roof that could increase the wind speed when the wind passed between two obstacles on the roof. Blocken et al and Hooff et al [38][39][40] studied the effect of venturi roofs on ventilation and analyzed the effect of the venturi and wind-blocking effects on venturi roofs. Then, they discussed the relationship between the width of the venturi roof and roof performance.…”

Section: Research Into Application Of the Venturi Effectmentioning

confidence: 99%

Study on the Influence and Optimization of the Venturi Effect on the Natural Ventilation of Buildings in the Xichang Area

et al. 2021

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Natural ventilation is a way to reduce the energy consumption of building operations and improve the indoor living environment comfort. The venturi cap is designed with a roof, grille and wind deflector to intensify the natural ventilation of buildings. The structural parameters of the venturi cap were designed using an orthogonal design. Fluid analysis software was used for numerical simulation, and variance analysis was used to study the importance of seven influence factors: the width of the roof opening, the roof slope, the height of the wind deflector, the horizontal width of the wind deflector, the angle of the wind deflector, the angle of the grille, and the spacing of the grille slices. The results show that the most significant influencing factor is the width of the roof opening, while significant influence factors include the angle of the grille and the horizontal width of the wind deflector. Additionally, the optimum parameter combination for ventilation performance at the research level was put forward, with the proposed combination achieving a volume flow rate of 5.507 m3/s. The average temperature of the horizontal plane at a height of 1.2 m above the ground was 3.002 K lower than that without a venturi cap, which provides a reference for the optimization of indoor ventilation design in buildings in the Xichang area.

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“…Thus the natural ventilation and illumination is problematic in the space far from the external façade. Solving this, a Venturi wind draft accelerator is applied to serve as passive (natural) ventilation and as a skylight roof structure [10], [11].…”

Section: Optimized Room Arrangement and Building Shaping 201mentioning

confidence: 99%

Optimized room arrangement and building shaping of an industrial and office facility

Androsics

Baranyai

2020

Pollack Periodica

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Abstract:This paper proposes the application of energy efficient, low tech (passive) building design strategies and concepts in an industrial facility case study, in order to create a building with high efficiency and comfort within the boundaries of a tight investment cost. The planning process is supported by dynamic thermal and daylight simulations. Two versions were considered, a conventional industry building and a low tech one with climate zone based space organization. According to the evaluation of thermal and visual comfort as well as energy demand the selected version with the innovative passive concept delivered considerably better performance. According to the constructor’s concept, the reference building had to be placed by minimal adaptation on the new site. After considering and calling this concept into question, a new ‘energy design’ concept was elaborated at the sketch planning level. The new concept was compared with the reference building and a quantified, simulation assisted evaluation was provided about the cases. Since there was an essential improvement in comfort and energy level and, in addition, at architectural standard, the constructor could have been convinced to accept the new concept.

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Numerical analysis of the performance of a venturi-shaped roof for natural ventilation: Influence of building width

Cited by 26 publications

References 19 publications

On the suitability of steady RANS CFD for forced mixing ventilation at transitional slot Reynolds numbers

On the suitability of steady RANS CFD for forced mixing ventilation at transitional slot Reynolds numbers

Study on the Influence and Optimization of the Venturi Effect on the Natural Ventilation of Buildings in the Xichang Area

Optimized room arrangement and building shaping of an industrial and office facility

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