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Tray dryers (Practical Action Technical Brief)
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=== Drying data === Most of the experiences to date have been with drying herbs and fruits. Typical drying times for herbs in semi-continuous dryer at 55Β°C are 4 hours prior to the removal of the first tray, after which a tray of dry herbs can be removed every 15 minutes. Each tray removed is replaced with a tray containing 5kg of fresh herbs. In the case of sliced fruits however it requires 8 to 10 hours to dry the first tray. Thereafter, trays can be removed and loaded every 30-45 minutes. Drying data and production costs for a wider range of products are currently being investigated and Practical Action can access additional information through its network of development organizations. Organizations and enterprises seriously interested in developing dried food products may be interested to know that a test dryer has been designed that can be locally constructed. This allows drying rate curves for a given food to be quickly and cheaply prepared. Such information is invaluable to those involved in equipment design and new product development. The unit consists of one foot box heated (in the same way as the tea-chest dryer) by a domestic hair dryer. The tray of food being investigated is suspended from an electronic balance reading to 0.1g. The weight of product is then simply plotted against time as it dries. Drawings are available from Practical Action.
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