That's not a freeze dryer. That's a dehydrator. It moves air (tepid or hot) over food. You can duplicate it with some screens, cardboard, and a box fan for $20.
A freeze dryer first freezes the food to solidify the water, and then puts it under hard vacuum to cause that water to sublimate directly from ice to vapor. Dehydrators evaporate 90% of the water, freeze dryers sublimate 99% of the water.
You can use a dehydrator to make banana chips and beef jerky. You can use a freeze dryer to make powdered eggs and astronaut ice cream.
That's not a freeze dryer. That's a dehydrator. It moves air (tepid or hot) over food. You can duplicate it with some screens, cardboard, and a box fan for $20.
A freeze dryer first freezes the food to solidify the water, and then puts it under hard vacuum to cause that water to sublimate directly from ice to vapor. Dehydrators evaporate 90% of the water, freeze dryers sublimate 99% of the water.
You can use a dehydrator to make banana chips and beef jerky. You can use a freeze dryer to make powdered eggs and astronaut ice cream.
(post is archived)