VOLKER STEGER / SCIENCE PHOTO LIBRARY VOLKER STEGER / SCIENCE PHOTO LIBRARY
Solar drier. Farmer with a solar drier used to dry harvested fruit and vegetables in order to preserve them. This drier, an example of intermediate technology, traps the heat of the Sun to dry things within it. As such it is environmentally friendly and cheap to operate. The solar drier was developed by the University of Stuttgart, Germany.
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