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Microwave Vacuum–Assisted Drying of Green Peas Using Heat Pump and Fluidized Bed: A Comparative Study Between Atmospheric Freeze Drying and Hot Air Convective Drying.
- Source :
-
Drying Technology . Apr2013, Vol. 31 Issue 6, p633-642. 10p. 3 Black and White Photographs, 4 Charts, 3 Graphs. - Publication Year :
- 2013
-
Abstract
- This study investigates the performance of microwave vacuum–assisted drying (MVD) of green peas using both fluidized bed and heat pump systems. A comparative study of heat pump–fluidized bed atmospheric freeze drying (HP-FB-AFD) and heat pump–fluidized bed hot air convective drying (HP-FB-HACD) was conducted. The initial drying rates of green peas were 0.04 and 0.12 1/min for HP-FB-AFD and HP-FB-HACD, respectively. Moisture diffusivity of green peas dried in HP-FB-HACD and HP-FB-AFD were 1.04 × 10−9and 6.94 × 10−11 m2/s, respectively. HP-FB-AFD did not entail changes in the starch granules and preserved the sample size and shape with minimal shrinkage (20%), whereas HP-FB-HACD generated significant volumetric shrinkage (50%). HP-FB-AFD+MVD created a desirable porous inner structure of the final product. HP-FB-HACD+MVD significantly increased the hardness of the dried product and produced green peas with a compact structure and tightly packed cells. Neither HP-FB-AFD+MVD nor HP-FB-HACD+MVD significantly influenced the color of dried green peas. To respond to the current demand for high-quality products, the multistage combined HP-FB-AFD+MVD method is an interesting technique for green peas processing. [ABSTRACT FROM PUBLISHER]
- Subjects :
- *PEAS
*MICROWAVES
*HEAT pumps
*FREEZE-drying
*HOT-air heating
*COMPARATIVE studies
Subjects
Details
- Language :
- English
- ISSN :
- 07373937
- Volume :
- 31
- Issue :
- 6
- Database :
- Academic Search Index
- Journal :
- Drying Technology
- Publication Type :
- Academic Journal
- Accession number :
- 87373967
- Full Text :
- https://doi.org/10.1080/07373937.2012.751921