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Tray dryers (Practical Action Technical Brief)
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== Cross flow chambers == Although Practical Action has not developed this system it is considered worth mentioning inthis short brief. In this chamber the air is blown, through a series of louvers, directly across the trays and then re-circulated over the heater. In the early stages of drying, when a lot of water is being removed, a high proportion of the air is vented to an exit and replaced by fresh air. As drying proceeds the proportion of vented air is reduced. At the end of the drying cycle no air is vented. This system then overcomes the problems associated with batch and semi-continuous cabinets in that: * labour costs are low as it works like a batch dryer<br> * all the trays dry at the same rate<br> * fuel efficiency is maximised.<br> Cross flow systems are technically more complex and require automatic humidity sensors to control the percentage of air vented during the drying cycle.
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