Microwave knowledge
Operating temperature and operating pressure of th
Operating temperature and operating pressure of the drying process
Most dryers operate at near atmospheric pressure, a weak pressure to prevent internal leakage to the outside, in some cases, if not leak to the outside the micro-vacuum operation.
Vacuum operation is expensive, only when the material must be in low temperature, oxygen, or in the temperature or high temperature operation odors circumstances that recommended. High temperature operation is much more effective, thereby evaporation for a given gas flow rate can be lower and a smaller device. The availability of low-temperature heat or heat from the solar collectors to obtain, you can choose low-temperature operation. However, these dryers larger in size.
Vacuum at temperatures below the triple point of water under a freeze-drying operation is a special case. When freeze-dried ice sublimate directly into water vapor. While sublimation heat required is several times lower than the evaporator, but vacuum operation is expensive. For example, the price of coffee is freeze-drying spray drying Romania 2-3 times, but on the other hand, the preservation of product quality and flavor is better.
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