Numerical analysis of wind-driven cross ventilation in long buildings

Chia Ren Chu, Bo Fan Chiang

Research output: Contribution to conferencePaperpeer-review

Abstract

The rule of thumb for effective wind-driven cross ventilation suggested that the length of the building should be less than five times of ceiling height. This study uses a Large Eddy Simulation model to investigate this rule of thumb for buildings of different length. The numerical results reveal that the windward pressure is independent of the building length, but the leeward pressure of short buildings is lower than that of long buildings, because of the reattachment on the roof of the long buildings. Therefore, the ventilation rates of short buildings are higher partly due to the larger pressure difference between the windward and leeward façades. The other reason for the ventilation rate decreases as the building length increases is owing to the friction inside the building. The internal friction can produce a sluggish zone inside the building, and reduce the total flow rate of cross ventilation.

Original languageEnglish
Pages84-91
Number of pages8
StatePublished - 2014
Event13th International Conference on Indoor Air Quality and Climate, Indoor Air 2014 - Hong Kong, Hong Kong
Duration: 7 Jul 201412 Jul 2014

Conference

Conference13th International Conference on Indoor Air Quality and Climate, Indoor Air 2014
Country/TerritoryHong Kong
CityHong Kong
Period7/07/1412/07/14

Keywords

  • Building length
  • Computational fluid dynamics
  • Large eddy simulation
  • Wind-driven cross ventilation

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