Ventilation investigations in a densely built up area of Hong Kong to describe thermal comfort
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AbstractFor the tropical climate of Hong Kong better ventilation is needed urgently for the improvement of thermal comfort conditions. The investigation shows the influence of building structures, orientation of streets and the local sea breeze effect on the ventilation conditions inside the Urban Canopy Layer. The government of Hong Kong has recently published an Air Ventilation Assessment System (AVAS) for guiding development and planning. Developments of a certain characteristics are required to undertake the assessment in order to ensure that they do not obstruct too much of the wind/air movement at ground level for pedestrian comfort. This is the first governmental legal system in the world dealing with weak wind conditions, design and planning. In this framework wind measurements were carried out. The case study side was within a densely built up area under reconstruction on Hong Kong Island. Topics were influence of sea breeze inside the urban fabric, thermal induced circulation systems and air temperature. On that base thermal comfort was calculated. Results were taken to study the conditions within the UCL in 2 m height. The case study results were evaluated and to combined with an existing CFD calculation. As result a ventilation pattern is drawn and the effect on thermal comfort is discussed. Ventilation pattern shows clearly the different effects of sea breeze penetrating the city depending on the main wind speed and wind direction but also on the daily variation. Barrier effects of some buildings were studied in a scale of 1:2.000. In some parts wind direction was influenced and channelled by the buildings in a total opposite direction from sea breeze. Barrier effect of buildings could be mapped. The wind and temperature analysis of this local circulation of Hong Kong Island was than used for a thermal comfort discussion for the conditions near the ground.
All Author(s) ListKatzschner L., Ng E.
Name of Conference23rd International Conference on Passive and Low Energy Architecture, PLEA 2006
Start Date of Conference06/09/2006
End Date of Conference08/09/2006
Place of ConferenceGeneva
Country/Region of ConferenceSwitzerland
Detailed descriptionorganized by Universite de Geneve,
LanguagesEnglish-United Kingdom
KeywordsThermal comfort, Ventilation

Last updated on 2020-08-07 at 02:29