The Raheja Solar Dryer is a tunnel solar dryer that is available in different capacities for small- to large-scale farmers to dry their produce. The dryer has a solar heat collection area, where the heat from the sun is generated, and a drying area, where the food is kept to dry. The Raheja Solar Dryer is designed to protect drying foods from UV radiation, dust, dirt, insects and pollution. The dryer is available in four different sizes: the Domestic Purpose Solar Dryer, the Small Farm Purpose Solar Dryer, the Commercial Purpose Solar Dryer and the Polyhouse Design Solar Dryer.
SDG 2: Zero Hunger
SDG 7: Affordable and Clean Energy
Market Suggested Retail Price
Market Suggested Retail Price (Secondary Currency)
Target Users (Target Impact Group)
Small and Medium-sized Enterprises
Distributors / Implementing Organizations
Raheja Solar Food Processing sells the product directly to users.
The dryer is built using UV-stabilized polyethylene sheet, which traps the heat from the sun to dry the food under the sheet. Other building materials include fans, supporting pipes and trays made using food-grade SS 304 mesh with teak wood frame.
Intellectural Property Type
User Provision Model
The product is sold through Raheja Solar Food Processing's website.
Distributions to Date Status
As of 2020, more than 320 solar dryers have been distributed throughout IndiaInterview with representative in 2020
Drying capacity (lbs/m³)
Drying duration (hr)
Load capacity (m³)
Operating temperature range (°C)
Number of trays
Materials of construction
UV-stabilized polyethylene sheet, supporting pipes, food-grade SS 304 mesh with teak wood frame, fans
The Raheja Solar Tunnel Dryer is designed to work on the principle of greenhouse effect, where heat from solar radiations gets trapped in an enclosed area. Heat from solar radiations is generated by the black floor. By forced convection using fans powered by solar panels, the heat generated is used to dry the food produce kept in the trays within the enclosed space. The solar tunnel dryer is available in four different sizes. The Domestic Purpose Solar Dryer has a size of 2 x 4 sq ft and has a drying capacity of 5 kilograms. The Domestic Purpose Solar Dryer uses a solar panel with a capacity of 5 W 12 V. The Small Farm Purpose Solar Dryer has a size of 4 x 8 sq ft and an average drying capacity of 20 kilograms. The Small Farm Purpose Solar Dryer uses a solar panel with a capacity of 10 W 12 V. The Commercial Purpose Solar Dryer has a size of 4 x 40 sq ft and an average drying capacity of 100 kilograms. The Commercial Purpose Solar Dryer uses a solar panel with a capacity of 40 W 12 V. The Polyhouse Design Solar Dryer has a size of 8 x 24 sq ft and can dry up to 500 kilograms of food when used in three vertical layers. The Polyhouse Design Solar Dryer uses a solar panel with a capacity of 120 W 12 V.
Provided by manufacturer
UV stabilized Polyethylene sheet, supporting pipes, food-grade SS 304 mesh with teak wood frame
Manufacturer Specified Performance Parameters
The Rajeha Solar Tunnel Dryer is designed to be easy to install and operate.
Vetted Performance Status
No third-party tests have been completedInterview with representative in 2020
There are no known safety hazards linked with the use of this product.
Complementary Technical Systems
A solar panel
Academic Research and References
Eltawil, M. A., Azam, M. M., and Alghannam, A. O., 2018, Energy analysis of hybrid solar tunnel dryer with PV system and solar collector for drying mint (MenthaViridis). Journal of Cleaner Production, 181, pp. 352-364.
Rabha, D. K., Muthukumar, P., and Somayaji, C., 2017, Experimental investigation of thin layer drying kinetics of ghost chilli pepper (Capsicum Chinense Jacq.) dried in a forced convection solar tunnel dryer. Renewable energy, 105, pp. 583-589.
Srisittipokakun, N., Kirdsiri, K., and Kaewkhao, J., 2012, Solar drying of Andrographis paniculata using a parabolic shaped solar tunnel dryer. Procedia Engineering, 32, pp. 839-846.
Compliance with regulations