Development of a Compact Vacuum Freeze Drying for Jelly Fish (Schypomedusae)
DOI:
https://doi.org/10.11113/jt.v58.1543Keywords:
Vacuum freeze drying, mass losses, moisture ratio, jellyfish (Scyphomedusae), thin layer models, internal cooling, condenser•s heat lossAbstract
A new design of a vacuum freeze drying with internal cooling and heater from condenser’s heat loss was built and tested. The dryer was used to dry jelly fish (scyphomedusae) to study the effect of drying parameter such as temperature within the drying chamber on mass losses (evaporation) during freezing stage and moisture ratio at the end of drying process and also the drying rate of vacuum drying process. The cold trap temperature rise in when activated the heating from condenser’s heat loss. The midili thin layer mathematical drying model was used to estimate and predict the moisture ratio curve base on different drying chamber temperature. The result of this experiment show that mass loss during freezing stage decreased with a decrease in drying chamber temperature with constant pressure. Drying time reduced with an increase in drying temperature. Drying chamber temperature decreasing has a result pressure saturation of material lower than drying chamber pressure have an effect mass transfer should not occurs.References
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