S Bengi wrote:I have seen a top down solar dehydrator.
It uses the same black slide to heat the air then it enters at the top.
The air then falls as it cools evaporating water once it get to the bottom another solar chimney from the bottom to the top is employed thus heating the water heavy air again sending it upward.
laura sharpe wrote:there is good reason you never hear of the top down heat design, it could not possibly be a passive system as heat naturally rises.
I have had good luck using normal dehydration methods for tomato dehydration all the way down to a flake. I would line my screens in the solar dehydrator with teflon sheets and not pack the dehydrator too full.
I never made fruit leather as I do not like them .
tom Brue wrote:Is anyone using solar dehydrators in the gulf coast or other very humid areas? I saw mention on one of the radiant heat designs (black metal over single layer trays) about the high humidities in the Midwest. Down here is Houston, the humidity is almost always around 80% or more. If you walk outside and the humidity is oddly low, it's a miracle blessing! Those are "sick" days from work!
Anyway, would the solar driers work if the incoming works ready 80-90% saturated? Would they just be less efficient? Or not dry fast enough? I'm wondering if it's even worth building one here.
d a thermometer in several parts of ours. It gets really really hot here in the summer, and on a 110 degree day the top trays get up towards 125-130, the bottom trays are more like 110-115. I think electric dryers stay below 120. Some people are concerned with their food being exposed to temps more than 110 or even lower.....when the air temperature outside exceeds that I don't know how you'd go about drying food and keeping it cool enough to meet raw foodist standards. Luckily, we do not care.