Natural Ventilation Performance of HDB flats

In order to fulfill this objective, field measurement of three different HDB flats, i.e. 3-Room flat, 4-Room flat as well as Executive maisonettee were conducted. The three flat types selected represent the more distinct broad range of public housing accommodation in Singapore. 3 main parameters that include ambient air temperatures, relative humidity as well as air velocity were collected over an extended period of time for the three types of flats. The measurements were also carried out in two conditions i.e. with bedroom doors closed and opened in order to study their impact on natural ventilation. In order to have a better understanding of the airflow profile and distribution under these two different conditions, CFD simulations were also carried out. A comparison between the data collected from field measurements and that obtained from CFD simulations was also made to provide an insight into the accuracy of the CFD simulations and the issues that must be properly considered in the setting up of the boundary conditions for the simulations.