Despite being in a Tropical Climate, we are blessed with a pleasant natural air movement in our region. And if we can take advantage of it, then we not only get access to gentle breeze blowing always but also don't need to switch on the Air Conditioner in most circumstances. In fact, as part of an Eco-Friendly Architecture, we need to consciously look into incorporating a very good cross ventilation and air movement. After all good natural air movement is very healthy!
Here is how we can find out how to take advantage of the natural air movement:
The exact latitude and longitude coordinates are taken for the wind analysis. This image shows the Predominant wind direction across the site.
The Windrose Diagram of Chennai shows that dominant wind blows from the SW & NE most of the time it blows at 10-20 km/hr speed which is good enough to experience it. And it is not a surprise because the monsoon is also aligned to South-West and North-East. Remember that South-West is also the hottest corner of Summer, the vastu corner for the Master Bedroom but the originator of Wind for that period. That is a very conflicting set of parameters - we need breeze to enter in but not the sunlight; a very important consideration for good design.
Here is an example of designing the house based on the wind directions:
Some Inferences:
Using some natural barriers like trees in the South West, the hot air can be significantly cooled before passing through the house.
Let the SW bedroom window not be the first line of attack for the Sun.
Having indirect openings in the Western and South west directions can allow moderate breeze to pass inside.
Having wide openings in the North Eastern direction can allow cool air to easily flow.
A perforated East wall will make the interior even more cool in winter and monsoon months.
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