Solar Conduction Dryer
The Solar Conduction Dryer (SCD) is a solar powered food dehydrator that uses all three types of heat transfer modes (conduction, convection and radiation) to dry food.
The solar conduction dryer (SCD) is a solar powered food dehydrator, that uses all three types of heat transfer modes; conduction, convection and radiation. The product’s business model aims to integrate key stakeholders to create an ecosystem where the SCD creates a business opportunity for dehydrated food commercialization.
It has been implemented in India, Kenya, Sri Lanka and Vietnam.
Total market size for dehydrated products is $16 billion. Estimated demand for SCD’s in India and Kenya is 3 million dryers.
The product is produced in India and distributors are being created in Kenya, also it is distributed through some NGO’s and implementation agencies.
A 10-12 kg capacity SCD has a $542.76 price in India (converted from Indian Ruppes 6/23/2017) and the cost outside India is $640. For a 100 kg capacity SCD the price in India is $4342.13 and outside India $5,120. These prices do not include transportation and duties. Interview with representative
Large-scale commercial dehydrators and other traditional methods for food preservation. For example SunWorks solar food dryer, GoSol Sol5 Oven, Kinosol Orenda food dehydrator.
The product is intended for individual women and small farm holders.
Made to order, loading capacity is 10-12 kg but can be customized per customer need.
Directly from manufacturer; S4S technologies.
Around 650 solar conduction dryers are operating in India and Kenya, impacting 3,000 lives. More than 1,200 farmer cooperatives across 8 countries are using it.
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
Design specification details of the solar dryer:
The SCD has four drying chambers constructed from hollow sections of stainless steel. Each chamber has a drying tray which is covered with transparent plastic. The trays are coated with black color special food grade coating, where the products to be dried are placed. A low height air vent to create air current is provided at the middle of the dryer along horizontal direction which also separates the drying chambers in two parts.
The manufacturer offers technical support as well as training through a partnership with NGO’s and implementation agencies.
Specified performance targets:
- Can be easily assembled by two people locally.
- Has a capacity of 12 kg/dryer.
- Able to maintain 45% more nutrients.
Dehydrated products retain 80%-90% of key nutrients. It is said to increase in shelf life of products from 6 -12 months and to reduce 40% in post harvest losses. It meets international standards in terms of microbial count and aflatoxin level. The product is said to save 20 tons of CO2 throughout its lifetime. Interview with representative
Manufacturer claims that product is tested and verified by international food laboratories.
Risk of burns from handling hot trays.
The SCD designer identifies food processing companies which are interested in buying dehydrated products, and makes field trials to create samples for those companies so that a business contract can be made. The designer also works closely with NGO/implementation agencies to train farmers on the dryer’s usage, processing and packaging.
Borah. A, Hazarika. K, Khayer S.M. 2015. Drying kinetics of whole and sliced turmeric rhizomes (Curcuma longa L.) in a solar conduction dryer. Information Processsing Agriculture. 2(2):85-92.
The manufacturer has indicated compliance with international standards regarding microbial count and aflatoxin level. Materials such as stainless steel and black coating paint are special for food grade applications.
Testing and verification of international standards for microbial count and aflatoxin levels through international food laboratories.
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