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Tray dryers (Practical Action Technical Brief)
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== Batch Tray Dryer == Batch cabinets are the simplest and cheapest to construct. The cabinet is a simple large wooden box fitted with internal runners to support the trays of food being processed. The trays are loaded into the chamber, the doors closed and heated air is blown through the stack of trays until the entire product is dry. As the hot air enters below the bottom tray, this tray will dry first. The last tray to dry is the one at the top of the chamber. The advantages and disadvantages of this system are: [[File:tray dryers double chamber batch dryer.jpg|thumb|Figure 3: A typical double chamber batch dryer]] * simple, low cost chamber<br> * low labour costs β simply load and then unload<br> * a tendency to over-dry the lower trays<br> * low efficiency, in terms of furl consumption, in the later stages of drying when most of the trays are dry.<br>
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