Evaluation of natural ventilation systems in tall buildings considering altitude based environmental variations

Karadağ, İlker
Buildings relied on natural ventilation strategies alone for many centuries up to the post-World War II period in which cheap energy started to liberate architecture from its connection with the natural environment. Then, the economic downturn in the 1970s, fuelled by the worldwide energy crisis in 1973 drew the attention to reduction and conservation of energy, the response was the model of the sealed glass box with an acceptance of the air-conditioning system. This resulted in Sick Building Syndrome (SBS) caused by the quality of the internal air and created the basis for widespread criticism in the 1970s and 1980s. Now, the current key decision should be the re-introduction of the natural ventilation systems into the tall buildings, since natural ventilation embodies a number of advantages such as reduced CO2 emissions, elimination of SBS, better internal air quality, reduced energy consumption with reducing demand on Heating, Ventilating and Air-conditioning systems. In this study, naturally ventilated tall buildings are evaluated with respect to their natural ventilation systems’ efficiency. While doing this, some key parameters to assess natural ventilation systems is benefitted. Besides, the characteristics and gradient of vertical variations of environmental parameters influencing natural ventilation directly, such as temperature, wind velocity and direction, humidity and air pressure are examined to make it clear whether they provide new or improved strategies for natural ventilation or not. It is concluded that, natural ventilation systems encompasses more than simply operable windows and narrow plans, and to use natural ventilation systems in tall buildings, generic principles of natural ventilation as a background should be researched and this should be followed with investigation of advanced systems that enable natural ventilation at higher levels of the tall buildings.


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Citation Formats
İ. Karadağ, “Evaluation of natural ventilation systems in tall buildings considering altitude based environmental variations,” M.S. - Master of Science, Middle East Technical University, 2014.