Evaluation and Design of Natural Ventilation for Houses in Thailand*
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Abstract
This research paper presents guidelines for evaluation and design of natural ventilation for
suburban houses in Thailand which is a part of building energy code development for residential buildings.
The initial studies find that it is possible for natural ventilation to achieve thermal comfort conditions in
place of mechanical air-conditioning systems, especially in winter. The experimental research is divided
into two parts: environmental arrangement and building opening. By measuring air conditions flowing
through different generic types of environment, it is found that the best environment is that covered
with large trees. Computational fluid dynamics studies on generic houses discover that cross ventilation
is more effective than two-side ventilation, and is much more effective than one-side ventilation. In
general, increasing the size of openings improves the effectiveness of natural ventilation. However, the
optimum effective opening area in rectangular rooms is found to be 20 percent of functional floor area.
The findings from this research lead to the house evaluation method by factors of orientation and size
of building openings. The method is successfully tested with different types of houses.
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