Multi-storey buildings with double-skin facade are not numerous and there is little experience of their behaviour in operation.In this study the authors analyze the impact of the double-skin orientation, the impact of the wind orientation, and the degree of wind protection on the facades. Simulations were realized too.
The effect of draughts on the steady thermal stratification established by a localised heat sourceat floor level in a naturally ventilated enclosure with upper and lower openings is considered. Ourexperimental observations in water using models indicate that four different steady flow patterns arepossible depending on the relative areas of the upper and lower openings.
The main aim of that study is to assess the status of natural ventilation in a typical four-room HDB (Housing and Development Board) flat in Singapore using scaled model in the wind tunnel and also to develop an effective passive or active stack system to enhance natural ventilation in the flat.
This paper presents the advantages and drawbacks of natural ventilation. . The author points out that a natural ventilation would be satisfying, mainly for buildings in mild climates, in taking account the type and quantity of sources in the occupied spaces.
The performance of a passive cooling system was evaluated as part of design works for theproject of an auditorium. The passive cooling system incorporates an array of buried pipes together with a solar chimney. The natural ventilation is enhanced with the help of the solar chimney and fresh air is cooled by circulation within the buried pipes. The application of this system to the acclimatization of an auditorium was evaluated. A model was developed on this purpose, which allows foreseeing the temperature and relative humidity of the air in the auditorium.
This paper deals with the study of natural ventilation in a building under tropical climates. Roomair distribution is analyzed with a statistical approach. The building is a cube with two opposing outdoor large openings. The cube is modeled using the RNG k-e model. A dimensionless velocity coefficient for different wind directions is evaluated for each indoor cell of the grid. Cumulative distribution function of this coefficient is calculated at different height to point out the influence of the wind direction.
Natural night ventilation is an energy efficient way to improve thermal summer comfort.Coupled thermal and ventilation simulation tools predict the performances. Nevertheless, the reliability of simulation results with regard to the assumptions in the input, is still unclear. Uncertainty analysis is chosen to determine the uncertainty on the predicted performances of natural night ventilation. Sensitivity analysis defines the most important input parameters causing this uncertainty. The results for a singlesided ventilation strategy in a single office are discussed.
In this paper a method to solve a design problem of hybrid ventilation system is proposedby building stack pressure around the ventilator using a flat bed, glass-shielded rectangular solarchannel. In support of this idea a CFD (Computational Fluid Dynamics) simulation based ontheoretical calculation is done. Here, natural convection and a k-e two-equation turbulence modelwere used together with the finite volume method.
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