Low-pressure superheated steam drying

Pimpaporn, R, Devahastin, S., Chiewchan, N. (2007). Effects of combined pretreatments on drying kineties and quality of potato chips undergoing low-pressure superheated steam drying. J. Food Eng., 81, 318-329. 

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. 

Devahastin, S., Suvarnakuta, P., 2008. Low-pressure superheated steam drying of food products, in Drying technologies in food processing, (eds X. D. Chen, A. S. Mujumdar), Wiley-Blackwell, West Sussex, UK, pp. 160-189. 

Kittiworrawatt, S., Devahastin, S 2009. Improvement of a mathematical model for low-pressure superheated steam drying of a biomaterial. Chem. Eng. Sci. 64 2644-2650. 

Suvarnakuta, S., Devahastin, S., Sopomonnarit, S., Mujumdar, A. S., 2005b. Drying kinetics and inversion temperature in a low-pressure superheated steam drying system. Ind. Eng. Chem. Res. 44 1934—1941. 

Drying of banana slices using combined low-pressure superheated steam and far-infrared radiation. Journal of Food Engineering, 81(3), 624—633. 

Thomkapanich, O., P. Suvamakuta, and S. Devahastin (2007). Study of intermittent low-pressure superheated steam and vacuum drying of heat-sensitive material. Drying Technology 25 205-223. 

Figure 7.5 Schematics of two low-pressure superheated steam lumber drying systems.

Nimmol, C., Devahastin, S Swasdisevi, T., Sopomoimarit, S 2007b. Drying and heat transfer behavior of a food product undergoing combined low-pressure superheated steam and fer-infrared radiation drying. 

There are two variants of this method low-pressure drying and high-pressure drying. This method is employed mostly in small battery plants or workshops. The superheated steam... 

Steam used for desorption should be saturated at low pressure, though dry or slightly superheated steam works as well. High pressure (temperature) steam is not needed. 

---