Abstract: Today's world is moving towards the use of clean and renewable resources due to the limitation of fossil resources fuels and the environmental problems caused by the consumption of non-renewable fuels. Solar energy is one of these sources that has particular importance due to its proper distribution around the world and its compatibility with the environment. Drying the agricultural products under the sunlight is one of the first uses of this energy. The use of this method leads to the high losses, low efficiency, and poor quality of dried product. To overcome these problems, researchers have designed, built and studied the variety of greenhouse solar dryers. In this study according to different criteria, the introduction and classification of greenhouse dryers have been studied and there is attempt to provide the complete aquantane with this technology for reader. In general, this article is a comprehensive resource for researchers, farmers, and investors that it has been compiled to improve the expansion and industrialization of this science.
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