Although solar drying
is a popular and very inexpensive method, some countries does not have
a suitable climate for it.
Solar dehydration of foods requires very low
humidity (below 60 percent is best) and 4 to 5 consecutive days when
the
temperature is around 100 degrees F. You can buy or prepare your own
solar
dryers.
Solar dryers use a reflectant such as stainless steel, aluminum
foil or glass to increase the sun's temperature by 20º to
30ºF.
To improve air current they have air vents at each end. Cooler air
enters
the dryer, crosses the food, removes moisture and escapes. Frame is
covered
with plastic and prevents rain or condensation from dampening the food
and screens over the vents keep insects off the food.
Solar dryers may need turning
or tilting throughout the day to capture the direct, full sun and food
on the shelves needs to be stirred and turned several times a day.
