This is two slightly different versions of the same solar chimney food dehydrator, Its counter intuitive because the hot air comes in the top and as the food dehydrates the moiste air falls and then goes up the side channel so that you have steady air flow. The food isn't exposed to the sun so you lose fewer nutrients.... supposedly.
The end of each file has a brief table that helps you determine the angle of the solar bed for your latitude to optimize sun collection
Solar Chimney Dehydrator
Solar Chimney and/or Downdraft Dehydrator plans 2016-05-20
Solar food dehydrator for off-grid food preservation