APPLICATION: Solar DryingApril 22nd, 2009
DESCRIPTION: The international market potential solar dryers is great especially in developing countries, where vast quantities of agricultural products are harvested and conventional fuels are expensive or unavailable.
There are basically three types of Solar Dryers
i. Direct: Solar radiation is directly incident on the crop in the drying chamber after passing through a transparent cover. The drying chamber and the solar collector are combined into one.
ii. Indirect: Air is first heated in the collector and then passes into the drying chamber.
iii. Mixed Mode: Features of both the direct and indirect solar dryers are combined.
The surface of the collector is usually coated in black (the absorbent surface) to increase temperatures within the drying chamber. This absorbent surface converts the sunlight to heat energy, which is passed on to the surrounding air by convection. The solar dryer is essentially an insulated box covered by a transparent cover, which allows sunlight in while reducing heat loss. Vents are located either on the sides or the bottom to permit inflow and outflow of air. The air is heated when it passes over the collector or collector area.
SPECIALIZED EQUIPMENT: Flat plate collector, vents
MANUFACTURER (S): Varied
COUNTRIES WHERE TECHNOLOGY IS UTILIZED: Worldwide
? Medium Scale Solar Crop Dryers For Agricultural Product: Oliver St. C Headley and William Hinds; Centre for Resource Management and Environmental Studies, University of the West Indies, Cave Hill Campus
iii. Internet site(s):
? The Australia Renewable Website (Austria Greenhouse Office)
? Centre for Rural Technology, Nepal
? Working Group On Development Techniques
i. Capital or initial costs:
ii. Operation and maintenance cost:
iii. Fuel energy costs: None
CAPACITY: 10 – 200M3
INPUTS / RAW MATERIALS UTILIZED TO PRODUCE: Solar Energy, Products to be dried
ORGANIZATION (S) PROMOTING TECHNOLOGY: Varied
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