The Effect Of Building Shape Modifications On The Performance Of Wind-Driven Natural Ventilation Of Low-Rise Building Using Computational Fluid Dynamics

Cheng , See Yuan and Herawan, Safarudin Gazali and Tee, Boon Tuan and Lee, Yuk Choi (2006) The Effect Of Building Shape Modifications On The Performance Of Wind-Driven Natural Ventilation Of Low-Rise Building Using Computational Fluid Dynamics. Project Report. UTeM, Melaka, Malaysia. (Submitted)

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Abstract

Natural ventilation in a residential building has the potential to reduce energy consumption and to provide a healthier living environment over mechanical ventilated building. The present study investigates the effect of the building shape modification on the performance of wind-driven natural ventilation of low-rise building using Computational Fluid Dynamics (CFD). A commercial code ANSYS CFX was employed to solve the flow governing equations. The standard k - & , renormalisation group (RNG) k- & and Shear Stress Transport (SST) turbulent models were adopted for comparison and the computed velocity was validated against site measurement data. Results computed with these three turbulent models were able to capture the trend of the measured wind speed at the chosen locations with appreciable discrepancy level. Maximum potential for cross-ventilation P under the effect of building modifications was calculated. At the windward side, highest P was provided when expansion is made on the kitchen zone on the neighbouring house. The house with fencing provided the lowest P value. At the leeward side, P for all type of building modification were lower than the windward houses. The estimated air flow rate for all cases based on the computed pressure coefficient were exceeded the required level for healthy living environment.

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