The solar drying of materials of biological origin plays an important role in energy savings, quality of end-products, and environmental impacts. The applicable temperature range and energy requirement for moisture removal are the most important parameters in designing a safe and cost-effective drying system. The traditional use of solar energy for drying is a forced convection heated air system, which can be used effectively for drying of various agricultural as grains, fruits, vegetables, medical plants, wood, fish, etc. An attractive advantage of solar dryer is that the same design of solar dryer can be used for different sorts of crops. The integrated use of solar energy means to maximize collection of all available energy resources, including solar, and distribute them optimally among the different consumers, including dryers.