Chimney Solar Dryer
The Chimney Solar Dryer is an efficient, low-cost solar dryer that is used to dry fruits and vegetables.
The Chimney solar dryer is designed by researchers at the University of California, Davis, for fruits and vegetables. The chimney dryer has been designed to provide good drying in hazy or partially cloudy conditions. The device can be manufactured from low-cost materials which can be found locally in the markets and shops around the world.
UC Davis Horticulture Lab has built the device in the United States, Ghana, Guinea, Kenya, Tanzania, Bangladesh, Thailand, Guatemala and Honduras.
The device can also be constructed using local materials following this guideline.
58.84 – 200 USD
Small holder farmers
The product can be locally manufactured following this guideline.
Users can construct the device using the following guidelines.
The amount of produce that can be dried
Time to dry product, measured in hours
Hold volume, measured in cubic meter
Temperature range for drying the produce, measured in degrees Celsius
Is there a mechanism to control temperature?
The number of trays in the system
The materials used in construction
The dryer is made of a long table covered with a black plastic that is connected to chimney at the end. The products are placed on mesh trays along the length of the table. A clear plastic is used to cover the trays and the table creating a tunnel that traps solar energy, heating the air and reducing its relative humidity. The dry, heated air speeds moisture loss from the product and the warm, moist air leaves the dryer through the chimney. The design of the dryer has been made to ensure there is little space between the black sheet on the table and the clear sheet covering the product in order to force the air to flow through a small cross sectional area and generates high air speed past the products thus accelerating drying. The end of the chimney is left open, to facilitate quick air flow, but it may be covered in case where there are insects and pests.
Plastic sheets in case of wear and tear
Designer specified performance targets include: fast and safe drying, easy to build, relatively high capacity, can be modified to suit the need of products and user.
No third-party organizations, only testing performed by the designer.
No known safety hazards are related to this product
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