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Solar Food Dryers?

 
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Location: Northern Germany
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pollinator
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This is a DEHYDRATING KITCHEN CABINET!

I don't know if this exact model would move air well. I wanted to get a rough idea of what this would look like.

The idea was to merge my latest solar dehydrator plans with the exterior wall of a kitchen, to allow for easy interior access to the dehydrating cabinet and contents.
SOLARDEHYDRATOR_WALLUNIT1_XX.jpg
Solar dehydrator in exterior wall of kitchen is an indoor cabinet.
Solar dehydrator in exterior wall of kitchen is an indoor cabinet.
 
Davin Hoyt
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These are units: A solar collector unit, and a dehydration cabinet unit.
I wanted to design the two pieces/units.... but I don't know if air will move through them well.
Not weather protected!
SOLARDEHYDRATOR_BOXES_PIC02.jpg
The two units.
The two units.
SOLARDEHYDRATOR_BOXES_PIC01.jpg
Two solar collectors and a dehydration cabinet assembled.
Two solar collectors and a dehydration cabinet assembled.
 
pollinator
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Modular design makes sense Second collector on top to draw air out should be effective. To clarify the design, is the exit side drawing air from the bottom of the cabinet?
 
Davin Hoyt
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Hans Quistorff wrote:To clarify the design, is the exit side drawing air from the bottom of the cabinet?


Yes. There is a false wall on the north side of the cabinet.
SOLARDEHYDRATOR_units_pic04.jpg
Air flow through solar dehydrating modular units.
Air flow through solar dehydrating modular units.
 
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Location: Bosque Village
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Here is the one I made.
I would like to make a room sized one later.

 
pollinator
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Hello...is there anybody out there?  I’m considering building a dry food system for next season. To stack functions it would be nice if the warm air could heat the home when it’s not in use as a dryer. One far fetched idea I had years ago was to run a long cloche up a hill, a clear tunnel going up the hill to a dryer or a home. It seems a lot of draft might get going. I’ve thought about a long sloped greenhouse also and what that could be used for. I also wanted to turn a entire house into a draft inducer for natural ventilation and heating.
 
Hans Quistorff
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Jeremy Baker wrote:Hello...is there anybody out there?  I’m considering building a dry food system for next season. To stack functions it would be nice if the warm air could heat the home when it’s not in use as a dryer. One far fetched idea I had years ago was to run a long cloche up a hill, a clear tunnel going up the hill to a dryer or a home. It seems a lot of draft might get going. I’ve thought about a long sloped greenhouse also and what that could be used for. I also wanted to turn a entire house into a draft inducer for natural ventilation and heating.


Those are workable ideas. In fact if a greenhouse is too hot for plants in the summer use it as a dehydrator.

If you have a solar heated tube running up the hill and buried earth cooled tube running down the hill, at night the circulation will reverse. the tube exposed to the sky will cool the air by radiating heat out causing the air to fall and the ground will warm the air causing it to rise. Thus some drying could occur at night as well as during the day.
 
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Which climate and season do you want to dry food in?

I live in such a dry climate that inside a sunny window in September and October is sufficient for drying food. Actually, in early September a sunny window is too hot, and foods high in sugar, such as fruit or tomatoes, burn. October is perfect here for a sunny window, or other seasons outside in a well ventilated spot such as on my flat roof. I got a little tent meant for keeping flies off an infant outdoors, and it works great for drying food. I just put trays and plates in it, consolidating them when the food is half-dry, and adding more every couple of days. If you are in a damp climate then yes, heating the air to reduce its relative humidity and using some system to increase the air flow are needed, and your idea could work.

About using the hot air for heating a house, I think it might be slightly helpful, but generally hot air doesn't make nearly as comfortable a heating system as direct passive solar gain and heat storage. But of course that's not possible in all locations.
drying-vegetables-in-a-sunny-window-in-Ladakh.jpg
[Thumbnail for drying-vegetables-in-a-sunny-window-in-Ladakh.jpg]
Drying vegetables in a sunny window in the high desert
 
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