Solar Drier – Model SD 22-3 is a solar drier made up of a solar air heater, perforated stainless steel trays and four small fan units. It is suitable for drying various fruits and vegetables ideally, with a maximum slice thickness of 6 mm. It can be used to dry food products such as fruits, vegetables, seeds, filleted/deboned fish and others.
Distributors / Implementing Organizations
Alvan Blanch Development Company Ltd distributes the solar drier product worldwide
The Solar Drier - Model SD 22-3 is customized to suit the requirements of the client. The main structure of the drier is made of mild steel painted Hammerite blue. The drier has stainless steel trays and a solar panel to help achieve drying evenly throughout the product.
Intellectural Property Type
User Provision Model
Users can obtain the Solar Drier - Model SD 22-3 directly from Alvan Blanch
Distributions to Date Status
Drying capacity (lbs/m³)
Drying duration (hr)
1 – 72
Load capacity (m³)
Operating temperature range (°C)
Number of trays
Materials of construction
The Solar Drier - Model SD 22-3 is made of mild steel painted Hammerite blue. It has fully adjustable inlet tray and outlet doors for temperature regulation and a translucent acrylic sheet. Solar collector tray is a 3mm mild steel painted black. The drier also has a chimney in spiral wound galvanised ducting and a woven screen for preventing insect entry. To dry products, sunlight heats the black mild steel surface of the drier, which in turn radiates heat and produces convection currents. Hot air rises through the wet product in the stainless steel trays, and warm humid air exists through the exhaust chimney. The trays can be easily accessed through a door in the side of the drying chamber. The time it takes for the drier to achieve a dried food product is dependent on the initial moisture content in the food product, slice thickness and environmental conditions such as air relative humidity, sunshine hours and temperature. Hence, it may take 1 to 72 hours to achieve a desired dried food product.
A Nigerian technical team, based in Benin City, handles all customer support in Nigeria – as well as some of the maintenance work across Africa. Alvan Blanch also has a number of commissioning engineers in the UK who travel to clients worldwide.
Replacement components are available with the initial purchase of the drier
Manufacturer Specified Performance Parameters
The drier is designed to be economical to use and simple to operate and maintain.
Vetted Performance Status
The potential hazard associated with the operation of this product include some burns.
Complementary Technical Systems
Academic Research and References
Stiling, J., Li, S., Stroeve, P., Thompson, J., Mjawa, B., Kornbluth, K., and Barrett, D. M., 2012, Performance evaluation of an enhanced fruit solar dryer using concentrating panels. Energy for sustainable development, 16(2), pp 224-230.
Whitfield, D. E., 2000, Solar dryer systems and the internet: Important resources to improve food preparation. Proceedings of International Conference on Solar Cooking, Kimberly, SouthAfrica.
Leon, M. A., Kumar, S., and Bhattacharya, S. C., 2002, A comprehensive procedure for performance evaluation of solar food dryers. Renewable and Sustainable Energy Reviews, 6(4), pp 367-393.
Janjai, S., 2012, A greenhouse type solar dryer for small-scale dried food industries: development and dissemination. International journal of energy and environment, 3(3), pp 383-398.
Compliance with regulations