Advantages Of Passive Ventilation

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Passive Ventilation Passive ventilation is a building design methodology that concentration on heat gain control and heat dissipation in a building in order to improve the indoor thermal comfort with low energy use. There are many different methods that can be employed to create a passive system. Some of which are more effective in certain situations and less effective in others. It is therefore important to use the method that will work most effectively in the situation. One of these is wind ventilation. This is one of the easiest and most common means of passive ventilation. It is simple because it only employs the use of openings in various configurations depending on scenario. The key to good wind ventilation is building orientation and…show more content…
Stack ventilation creates this differential by using warmer air and cooler air, whereas Bernoulli’s principle creates the differential by means of wind speed difference. Stack ventilation uses heated air to create the pressure differential to pull cool air into the building from the outside. This can be done in various ways. One of these is by using solar chimneys. Solar chimneys heat air that is in the higher portions of the building, they then allow the heated air out of their top, therefore creating the pressure differential that draws cold are into the lower parts of the building, thereby cooling the building. There are various ways of heating the air in the chimneys, the first being constructing the chimney out of a material that absorbs a lot of heat eg: steel. The second is to have one side of the chimney made up of glazing. Therefore allowing the sunlight to heat the air. The third is to have a glazed panel in the roof structure that heats the air before it moves into the chimney. See figure…show more content…
Internal spaces and structural members can be designed in such a way as to channel airflow through a building in varying directions, these elements can be termed as wind wings. See figure 2. It is important to note that weather diagrams may not be completely accurate to the site that one is working on, local conditions on the site may be slightly different to those indicated on weather diagrams. It is therefore important to do detail site analysis of the site one is working on, taking into account obstructions such as other structures, trees, walls etc. all of this must be taken into account before attempting to design passive heating and cooling systems. “For buildings that feature a courtyard and are located in climates where cooling is desired, orienting the courtyard 45 degrees from the prevailing wind maximizes wind in the courtyard and cross ventilation through the

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