3. The wind incident on a house is a resultant of the prevailing winds and the secondary winds from the
houses upstream. In Bangkok, the prevailing wind direction is NNE. The secondary winds in our design were from the NNE for the left part of the house or the NNE for the right part of the house. Hf the house had a long room on the west, as shown in Fig. 8d, there would be a large stagnation zone in the east part of the long room, because the resultant wind direction of the prevailing and secondary wind is NNE. Hf the long room is located in the east part of the house, the resultant wind direction is from the north, in which the ventilation is much better (Fig. 8d).