Low-Pressure Superheated Steam Drying LPSSD

Fig. 3.10 Low-pressure superheated steam drying (LPSSD) set-up. (1) Boiler (2) Steam valve (3) Steam reservoir (4) Pressure gage (5) Steam trap (6) Steam regulator (7) LPSSD chamber (8) Steam inlet (9) Electric fan ...

In terms of dried product quality, the volume and density of the carrots changed in a similar manner upon both VD and LPSSD. However, although both vacuum-dried and low-pressure superheated steam-dried carrots exhibited similar volumetric shrinkage (calculated from the change in the volume of a sample compared... 

VD Vacuum drying LPSSD Low-pressure superheated steam drying L, L lightness afier/befbie drying a, a redness/greeimess after/before drying b. b yellowness/... 

The basic fiindamentals of both conventional atmospheric-pressure Superheated steam drying and more novel low-pressure Superheated steam drying are presented in this chapter. The application of these processes to the drying of a wide variety of foods and biomaterials is illustrated and discussed, with emphasis placed on the use of LPSSD to preserve or even improve the properties of the drying materials. 

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