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Effect of two stage, tray and heat pump assisted-dehumidified drying on drying characteristics and qualities of dried ginger

Paper ID Volume ID Publish Year Pages File Format Full-Text
19390 43062 2011 9 PDF Available
Title
Effect of two stage, tray and heat pump assisted-dehumidified drying on drying characteristics and qualities of dried ginger
Abstract

Desorption isotherms for sliced gingers have been measured. A non-linear regression programme was used to fit four moisture sorption isotherm models to the experimental data. The Modified Halsey and Modified Oswin models gave the best fit for Xe = f(RHe, T) and RHe = f(Xe, T), respectively. Tray and heat pump dehumidified drying incorporated by single and two stage drying were conducted. It was found that the modified Page model was the most effective. The drying constant was fitted to drying air temperature using the Arrhenius model. Effective moisture diffusivities were determined using the drying data. The heat pump dehumidified drying incorporated by the two stage drying could reduce the drying time at 40 °C by 59.32% and increase 6-gingerol content by 6%. Quality evaluation by 6-gingerol content, rehydration ratio and ΔE* showed the best quality for dried sliced gingers in the heat pump dehumidified drying incorporated by the two stage drying at 40 °C.

Keywords
Desorption isotherm; Ginger; 6-Gingerol; Heat pump dehumidified drying; Tray drying; Two stage drying
First Page Preview
Effect of two stage, tray and heat pump assisted-dehumidified drying on drying characteristics and qualities of dried ginger
Publisher
Database: Elsevier - ScienceDirect
Journal: Food and Bioproducts Processing - Volume 89, Issue 4, October 2011, Pages 429–437
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Bioengineering