External shading devices have been utilized very extensively in residential buildings in the tropics to reduce the amount of solar radiation entering into the buildings. However, this will affect the availability of daylight for interior lighting as well as natural ventilation for passive cooling and thermal comfort. This paper discusses the impacts of six different types of external shading device on a residential building in Singapore. The investigation was carried out via the use of LIGHTSCAPE for daylighting simulations and PHOENICS CFD simulations for natural ventilation.
The Loop Equation Design Method has been proposed for sizing ventilation airflow components of natural and hybrid ventilation systems. While the loop design method has been demonstrated on a limited basis, the method has been automated in order to better evaluate its reliability under a more controlled, i.e., less error-prone, environment. This paper describes a computer program that implements the Loop Equation Design Method of sizing the openings of naturally ventilated buildings.
The hygrothermal behavior of a building component exposed to weather is an important aspect of the overall performance of a building. Today the hygric transport phenomena through a building envelope are well understood and a realistic assessment of all relevant effects can be carried out by one of the numerous models and computer programs, that have been developed in different countries over the last years. The calculation of the hygrothermal performance of a part of the envelope is state-of-the-art, but until now, the total behaviour of the actual whole building is not accounted for.
In tropical humid climate, thermal environment can be controlled using natural ventilation. But this technic raises the problem of acoustic comfort. Some technical devices coping with aeraulic and acoustic comfort constraints exist but they are not suitable in all economic context. Thus the urban research is exploring built configurations performances for future urban planning. This article presents an exploratory simulation method of these physical parameters, and analyses results of two guadeloupean urban fabric tests.
People that work in office buildings have new needs in terms of comfort within their work place. We suggest to develop a multicriteria office cell façade, allowing to control luminous, thermal and airflow parameters. It will be controlled to offer global
Turbine ventilator is an equipment that uses natural wind force to exhaust airflow ; such ventilators are widely installed in Taiwan to enhance building and factories ventilation. In theory, the combination of turbine ventilator with natural ventilation improves the indoor air quality while it decreases the reliance on air-conditioning. So that allows a reduction of the energy consumption.A variety of tests on different types of ventilators was conducted. The results proved it is helpful to increase ventilation with the installation of ventilators.
This paper analyses the cooling capacity and the possibilities of energy saving due to a correct natural ventilation.A correct exposure of the buildings to prevailing winds in a mediterranean area allows the reducing of cooling loads even in non-bioclimatic buildings, and without any cost. A correct natural ventilation offers great cooling capacity and possibilities of energy savings.
An investigation of the natural ventilation performance of an hawker center in Singapore is the subject of that study. Thermal comfort perceptions of the users of the center have been evaluated.The impact of four variations in the structure of the building on natural ventilation has also been explored (increasing size of passageway, openings in the roof, removal of end walls and increasing of the roof height)
This article describes a reliable tool for analysing and designing natural ventilation systems, based on fundamental flow equations : mass balance, energy conservation and momentum.
For the study of single-sided natural ventilation, a CFD model along with analytical and empirical models have been used, to determine the effects of buoyancy, wind, or their combination on ventilation rates and indoor conditions.
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