stack ventilation

This paper analyzed the influence of neutral plane on natural ventilation in workshop. For several typical heights of neutral plane of a molding workshop, its influence on ventilation was simulated by means of CFD. In designing natural ventilation, to coordinate the dimensions between the inlet and outlet openings and to play down the neutral plane properly may be the effective measures to increase ventilation efficiency.

Natural ventilation is a well known strategy to improve indoor air velocity and reduce indoor temperature. It is the main criterion to achieve thermal comfort in terraced housing in Malaysia. In hot and humid climates, one drawback to single sided ventilation is that the wind effect is not well captured, which in turn, increases the use of mechanical cooling. Therefore, it is important to understand and consider the use of the solar chimney as a stack induced ventilation strategy for a single sided ventilated room.

In the light of global environmental problems, it is vital for buildings to conserve energy and make use of natural energies. Natural ventilation is one important method for achieving this. In houses, natural ventilation is a very attractive way to control the indoor environment. Compared to this, mid- to high-rise buildings include many closed spaces where windows cannot be opened and internal heat is trapped inside, which increases the cooling load. Based on this situation, consciousness of environmentally friendly buildings and utilization of natural energy becomes high.

This study deals with the ventilation performance of two storey dwellings employing stack effect ventilation to satisfy the overall ventilation requirement. The SRF (Supply Rate Fulfillment) index was used as a ventilation performance index. The experiments were implemented to measure effective fresh air rate by using tracer gas in a test house. Following are the results of the experiments and the theoretical calculations. The measured air change rate and the SRF value were fairly close to the theoretical calculation.

In recent years, natural ventilation has been gaining credibility as a suitable passive design strategy for non domestic UK buildings. Many of the recently built naturally ventilated buildings in the UK incorporate ventilation stacks in various forms with the purpose of increasing ventilation during the summer months so that some cooling is provided during the day or by utilising night ventilation. This paper first describes briefly the stack ventilation strategies employed in a number of recently completed buildings in the UK.

Even when the hills have soaked up the rain and the lush green grass is bent flat in the wind, the Great Glasshouse in Wales can still offer a Mediterranean haven. But how do you create and service such an environment?

Research scientists at the BRE and De Montford University have carried out tests examining the performance and operation of stack ventilation systems in auditoria.

The paper outlines the value of roof intake air ducts to serve largely passively ventilatedand cooled buildings in urban areas. This approach improves air quality, reduces noisepollution and enhances security.A diagrammatic representation of night cooling using this approach is given followedby a description of experimental work at the Bartlett.