A low-cost energy efficient greenhouse – construction manual

Date: April 1, 2010

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The Low Cost- Energy Efficient Greenhouse iis designed to create a controlled environment for the growing of cool season vegetables at dramatically reduced heating costs through energy saving advanced technologies. The Cultivable area of the greenhouse is 394 m2, sufficient for growing 1000 tomato plants.
The structure is a combination of custom manufactured polyethylene plastics and relatively inexpensive “off-the-shelf” materials. There are two covers of polyethylene 20 cm apart; an outer multilayer tear resistant polyethylene cover that diffuses light throughout the greenhouse and an inner infra-red radiation trapping, anti-fog polyethylene cover. Additional savings are provided by a lightweight aluminium thermal blanket. The blanket covers the crop during the night; adding additional insulation and reducing the heating area.
The greenhouse is lightweight, and easy to erect. Two rolling shades extending down each side of the greenhouse are an additional cost-reducing structural component,. A simple winding mechanism enables one person to adjust heat and humidity inside the greenhouse in less than one minute.
Growing media is locally available coarse construction sand. This avoids the expense and difficulty of sourcing Perlite or Peat. The media is bagged, allowing the flexibility to change the plant rows to meet the needs of the crop.

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