7. Conclusions
This investigation explored the possibility for natural ventilation in houses in a hot and humid climate region, such as Bangkok, Thailand. The study shows that natural ventilation could be effective in the region during the winter (from December to February). Recent studies have found that the Thai people can live comfortably with much higher temperatures than westerners, so natural ventilation could also work in other seasons.
To achieve a comfortable indoor environment, natural ventilation should provide an indoor air velocity of 0.4 m1s. The corresponding total area of the inlet and outlet apertures should be about 40% of the total floor area. Hf the aperture area were decreased to 25%, the indoor air velocity would be
0.3 m1s. A ceiling fan can be used to increase the air velocity in this case.
The prevailing wind direction in the winter in Bangkok is either from the NNE or the SS�. The house can still be oriented facing north-south to avoid excessive solar radiation. Ht is not necessary to align the house according to the prevailing wind direction.
Since the land lots are small (240-250 m2), and the house floor area is large (160 m2), a rectangular house is not good for natural ventilation. This study found that it is better to use a square shape for the houses.
Consideration of the Thai culture and climate shows that it is better to design houses with two and a half floors. The first floor should be elevated to avoid foods and create better natural ventilation. The ground floor can serve as a service area and/or parking space. A stairway can serve as a wind scoop to augment the natural ventilation benefits of the elevated floor.
Other measures needed to enhance natural ventilation for houses in Bangkok suburbs include:
7. Conclusions This investigation explored the possibility for natural ventilation in houses in a hot and humid climate region, such as Bangkok, Thailand. The study shows that natural ventilation could be effective in the region during the winter (from December to February). Recent studies have found that the Thai people can live comfortably with much higher temperatures than westerners, so natural ventilation could also work in other seasons. To achieve a comfortable indoor environment, natural ventilation should provide an indoor air velocity of 0.4 m1s. The corresponding total area of the inlet and outlet apertures should be about 40% of the total floor area. Hf the aperture area were decreased to 25%, the indoor air velocity would be 0.3 m1s. A ceiling fan can be used to increase the air velocity in this case. The prevailing wind direction in the winter in Bangkok is either from the NNE or the SS�. The house can still be oriented facing north-south to avoid excessive solar radiation. Ht is not necessary to align the house according to the prevailing wind direction. Since the land lots are small (240-250 m2), and the house floor area is large (160 m2), a rectangular house is not good for natural ventilation. This study found that it is better to use a square shape for the houses. Consideration of the Thai culture and climate shows that it is better to design houses with two and a half floors. The first floor should be elevated to avoid foods and create better natural ventilation. The ground floor can serve as a service area and/or parking space. A stairway can serve as a wind scoop to augment the natural ventilation benefits of the elevated floor. Other measures needed to enhance natural ventilation for houses in Bangkok suburbs include:
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