By reducing the rate at which air passes through a solar wall into a building, more heat is absorbed by the air, which results in a much high temperature indoors. One can increase the indoor temperature to such a high value that the solar wall can be used for crop drying. Solar heat is often the preferable choice for crop drying because this type of heating doesn't burn or harm delicate foods, which often occurs when using steam or burning fuels.

 

Installing a solar wall system is fairly easy to do. The system is mounted onto already existing structures and can utilize the fan system that is already present. Advantages for using solar heating for crop drying include:

 

Solar energy is free, thus no air heating costs once the system is installed

This system creates no pollution

The solar wall is an all metal construction, ensuring a long system life

The fan system is the only moving part, making this system virtually maintenance free

Low cost and easy installation

Works as a heat exchanger at night to heat air

Using solar energy for crop drying is ideal for tea, coffee, fruit, beans, rice, spices, rubber, cocoa, and timber.