Permaculture in the Tropics
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Tropical Building Design Guidelines
•Windows placed in opposite walls provide for cross ventilation, but should not•be directly lined up to promote mixing of the air within the room. •Casement windows can be used for redirection of the wind if necessary. •Shuttered windows allow for shade•Windows on the east and west walls kept at a minimum create less solar heat gain•Louvred windows allow for the maximum ventilation and weather protection•Roof space ventilation reduces heat build-up•A long and narrow floor plan with the long axis oriented east-west minimizes heat gain•Open plan living spaces with high ceilings maximize air movement•Walls perpendicular to the air flow should be minimized•Elevation of the house improves ventilation beneath•Extensive verandahs provide shade•Metal roofs with reflective coatings allow rapid cooling at night•Materials with high thermal capacity such as bricks, concrete, etc. should be avoided
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Natural Ventilation 1.1 Window Placement- indoor airflow parallel to outdoor wind conditions 3 1.2 Airflow Path- indoor airflow traverses room in non-linear path 21.3 Roof Space Ventilation- airflow through roof space 21.4 Elevation of House- air circulation beneath house 11.5 Window Design- simultaneously providing ventilation and shade 31.6 Flow Compliance- less than 50% of square footage more than 2 rooms deep 1 Shading 2.1 Orientation on Site- long axis of building along east-west direction 3 2.2 Mnimizing Heat Gain- no windows in east and west facing walls 1 2.3 Optimal Floor Plan- around/at least 1:1.7 ratio width to length 2 2.4 Outdoor Space Shading- verandahs at least 3’ deep covering 50% of building perimeter 3 Materials 3.1 Minimal Heat Absorption- lightweight construction for walls 23.2 Cooling- heat conducive material for roof 2
3.3 Recycled Content- at least 25% of building materials 1
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Forest garden in uplands of Uva Basin, Sri Lanka
jak
avocado
cassava
areca
kitul
banana
tea
coconut
papaya
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Natural forest Forest garden
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Alley cropping
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Multilayer tree gardens
Coffee, pepper-on-gliricidia, coconut. Sri Lanka
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Acacia nilotica in rice crop providing shelter, organic matter, fodder, fuel. India
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Cardomon grown under natural forest, Sri Lanka
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‘SALT’ hedgerows on for soil conservation and green manure on organic tea
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Multi-species ‘chinampa’ system in Philippines
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