Turn with wind (Badgir)

A Badgir or “turn of the wind” (in Persan: بادگیر) is a traditional element of Persian architecture used since centuries to create a natural ventilation in the buildings. One does not know who invented the sensor of wind, but it can always be seen in many countries today. The form taken by the badgirs is varied, like the one-way one, the bidirectional one or the multidirectional one.

It is thought that the functions of the sensor of wind exist because they are a consequence of the difference in height between the base and the top. The difference in height creates a weak difference in pressure between the base and the top of the internal column of badgir to each time a weak breath of wind passes through the top of the sensor of wind (one does not feel the difference at the base of the column). The difference in pressure thus helps to go up the hot air towards the top and to bring fresh air to the bottom of the column. The effect of accumulation over one 24 hours period is notable.

Coupled with the properties of the believed ground, that increases qualities of resistance to the heat transfer; the sensor of wind can then considerably refresh low spaces in the mosques and the houses in full day.

The to badgir was so effective in the Iranian Architecture which it was for a very long time used as cooling element. Many traditional water tanks were built coupled to sensors of wind, thus allowing sotcker water extremely fresh temperatures during the summer months.

See too

External bonds

  • Yazd, the city of the sensors of wind.
  • a sensor of wind with Kerman, Iran
  • Operation and principles of the turns of the winds of Yazd, Iran (file of cyberarhi.com)

Photographs

  • more than 180 photographs with the tag “to badgir” (Flickr)
  • Badgir - Turn of the wind, Yazd, Iran

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