In hot tropical climate, heat is the major factor affecting building design. By placing the buildings along an east-west axis (with tolerance of 10-15 degrees off this axis), the high summer sun is blocked while building can take advantage of low winter sun exposure. Prevailing wind direction in Kenya from Northeast is another factor considered in the orientation of the building.
The wall of building on south elevation is aligned by the angle of summer sun(70 degree) to avoid sun as well as provide shadow for the floor below.
The other passive strategy is porous volume in the middle which accommodates stairs. The heat rises and dissipates through porous walls as well as under roofed screens on four sides.
Natural ventilation can be fostered by the fan installed under roof which get their energy from Photovoltaics panels on the roof.
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