6. Discussion
The proposed design has some constraints. The first costs may be high because of the elevated first floor. Hf the first floor is built on-slab, the ventilation rate would be reduced. This problem can be remedied by using a ceiling fan or solar chimney. The large aperture necessary for natural ventilation has some negative features, such as allowing outdoor air pollutants, outdoor noise, and insects to enter the house, reducing privacy, and creating potential security problems. However, in suburban areas, the air is much cleaner and there is less traffic noise. Mosquito nets and privacy and security screens could solve the other problems. Although the screens reduce the velocity of the wind, the wind speed is still high enough to shift the indoor condition into the comfort zone. Such screens are available on the market, but are beyond the scope of this research.
Another major constraint of this scheme is that people may not understand the overall ventilation concept and change their houses afterwards. For example, if they con¬struct more walls to divide indoor spaces on the ground floor, the wind distribution throughout the neighborhood could change. The high velocity at ground level will no longer benefit their neighbors. The proposed scheme therefore cannot be executed without providing some fundamental knowledge or guidelines to the residents.
in addition to the wind-driven natural ventilation design addressed in this paper, it is possible to achieve natural ventilation through the buoyancy effect. Hirunlabh and coworkers [17-20] have published a number of papers on buoyancy-driven natural ventilation design for Thailand. The technologies used include the metallic solar wall [17], solar roof collector [18], solar chimney [19], and night radiant cooling [20]. The metallic solar wall can generate a ventilation rate as high as 1.65 ach in their model room. A similar ventilation rate has been found for the solar roof collector. The solar chimney seems the most effective having generated ventilation rates between 8 and 15 ach. Night radiant cooling can depress surface temperature by 1-6oC. The best designs may combine wind-driven ventilation with some of those technologies proposed by Hirunlabh and coworkers. Such designs can be a subject of further studies.
6. Discussion The proposed design has some constraints. The first costs may be high because of the elevated first floor. Hf the first floor is built on-slab, the ventilation rate would be reduced. This problem can be remedied by using a ceiling fan or solar chimney. The large aperture necessary for natural ventilation has some negative features, such as allowing outdoor air pollutants, outdoor noise, and insects to enter the house, reducing privacy, and creating potential security problems. However, in suburban areas, the air is much cleaner and there is less traffic noise. Mosquito nets and privacy and security screens could solve the other problems. Although the screens reduce the velocity of the wind, the wind speed is still high enough to shift the indoor condition into the comfort zone. Such screens are available on the market, but are beyond the scope of this research. Another major constraint of this scheme is that people may not understand the overall ventilation concept and change their houses afterwards. For example, if they con¬struct more walls to divide indoor spaces on the ground floor, the wind distribution throughout the neighborhood could change. The high velocity at ground level will no longer benefit their neighbors. The proposed scheme therefore cannot be executed without providing some fundamental knowledge or guidelines to the residents. in addition to the wind-driven natural ventilation design addressed in this paper, it is possible to achieve natural ventilation through the buoyancy effect. Hirunlabh and coworkers [17-20] have published a number of papers on buoyancy-driven natural ventilation design for Thailand. The technologies used include the metallic solar wall [17], solar roof collector [18], solar chimney [19], and night radiant cooling [20]. The metallic solar wall can generate a ventilation rate as high as 1.65 ach in their model room. A similar ventilation rate has been found for the solar roof collector. The solar chimney seems the most effective having generated ventilation rates between 8 and 15 ach. Night radiant cooling can depress surface temperature by 1-6oC. The best designs may combine wind-driven ventilation with some of those technologies proposed by Hirunlabh and coworkers. Such designs can be a subject of further studies.
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