Semi-industrial Solar Dryer

Why to choose this solution?
Solar dryers prevent destruction of agricultural produce from rain, wind and contamination, dust, insects, etc. and thereby ensuring quality of the produce. It allows small-scale farmers to improve the storage conditions and reduces after harvest losses. The value of dried products is increased interms of quality, opening possibilities of higher market prices.
Savings per day or production:
The dryer needs nothing more than solar radiation of which her costs are practically free. The solar dryer can improve food security by allowing longer storage of food after drying compared to food that has not been dried.
Cost in money and in own time to construct:
Initial costs to acquire the semi-industrial solar dryer is high, total cost of the material is amounting to Tsh. 10 millions, however for well-managed solar drying business, payback period is 6-12 months.
Depending on handling, the dryer ultra violet (UV) resistant plastic (visqueen), could last for more than two years before changing it. The frame could last longer especially if treated with anti corrosive materials.
Maintenance needed:
After sometime, it requires replacement of visqueen papers, anti-corrosive material for treating frames.
Resources needed in use:
Solar radiations
Problems and limits:
Not workable at night, efficiency decreases to a large extent on cloudy days, overheating may occur if regular attention is not paid.
Where and how can you get it or make it?
Available in Tanzania, SESCOM is involved in construction and marketing.
Skills needed to produce, install. maintenance, use:
Training is needed on how to construct, maintain and use.
How to use it:
How to maintain it:
Climate effect (if any):
Drying food reduces its volume and fuel which would have been required for transportation hence reduced CO2 emissions as well, if solar drying replaces drying by electricity or fossil fuel, it reduces CO2 emissions.
Where it is used and how many users are there?
Semi-industrial solar dryer is used in Tanzania and there are more than 1000 users.
Why is it successful?
Successful due to its potential to increase the ambient air temperature to a considerable high value for increasing the drying rate of agricultural crop.
If you can make it, a short description, typical problems, materials needed.:
Some of the material needed include galvanized sheet 2mm, Visqueen sheet, Green plastic wire mesh, Square pipe, angle section, etc.
How to make it (if possible):
How is it delivered and by whom?
Main actors include suppliers of construction materials, constructors e.g. SESCOM, Small Industry Development organization (SIDO), NGOs involved in awareness raising and capacity building such as TaTEDO, development partners with interest to support the initiatives such as USAID, research institutions such as Sokoine university of Agriculture involved in technology improvement, research and the Ministry of Agriculture and Cooperatives.
Successful financial model
Local capacity building is one of the aspect that contributed to successful dissemination of semi-industrial solar dryer.
What policies and strategies helped the success?
Tanzania Horticultural Development Strategy 2012-2021, Agricultural Sector Development Strategy (ASDS), the Agricultural Sector Development Programme (ASDP).
More info:
Name of the association uploading the case:
Centre for Sustainable Energy Services (TaTEDO)
When was the case uploaded? (YYYY-MM-DD):