Natural Ventilation inside Courtyard – Apartment Building

• Main Authors: Duc-Anh Nguyen, 阮德英
• Other Authors: Wei-Hwa Chiang
• Format: Others
• Language: en_US
• Published: 2012
• Online Access: http://ndltd.ncl.edu.tw/handle/x678rr

碩士 === 國立臺灣科技大學 === 建築系 === 100 === Natural ventilation enhanced by buoyancy force of an indoor courtyard space was examined. A high-rise residential building located at subtropical Taiwan was studied in terms of heat evacuation. CFD software PHOENICS/FLAIR was employed to investigate the effects of design factors as well as environmental factors that were tested in sequences. The buoyancy force was mainly induced by the heat generated inside individual apartment units and a heated roof top space due to solar radiation. The gradient of air temperature and velocity in the courtyard space against height is non-linear and high values of gradient are found particularly near the top. The flow flux is generally large enough to remove heat from most of the occupied spaces. Except for the upper floors that may need further treatments, the air can be effectively evacuated through the top of the courtyard when the wind velocity is roughly 0.5 m/s or smaller. With a heated roof-top structure, the ventilation efficiency can be strengthened by bottom openings on the windward side that yields 38 % more velocity at the top of the courtyard than the worse case.