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Energy efficiency investigation of intermittent paddy rice dryer: Modeling and experimental study

Paper ID Volume ID Publish Year Pages File Format Full-Text
18918 43037 2015 9 PDF Available
Title
Energy efficiency investigation of intermittent paddy rice dryer: Modeling and experimental study
Abstract

•Temperature and drying duration were manipulated to optimize the energy consumption.•Moisture distribution within the grains was analytically obtained.•A correlation for moisture diffusivity was proposed and used based on experimental data.•Employing the tempering stages substantially reduces the energy consumption.•First drying stage was found to be the longest stage with a moderate temperature.

In this study, energy consumption of intermittent drying of paddy rice is considered. Firstly, a mathematical model consists of two parts is established to describe the moisture distribution within a grain for both drying and tempering stages. The model, which is solved analytically, is proposed based on Fick's second law of diffusion within a sphere. Effects of different parameters namely air temperature and velocity are experimentally investigated utilizing a lab-scale fluidized bed dryer. Thereafter, moisture diffusivity is estimated in Arrhenius form using experimental results. Finally, the model is utilized in an optimization problem to minimize the total energy consumption. Based on experimental results, impact of air velocity on drying characteristics is found to be negligible. The optimization results shows that employing the tempering stages substantially reduces the energy consumption. Not only that, it dictates a process beginning with longer drying stages and lower temperatures while the subsequent stages are shorter with higher temperatures.

Keywords
Mathematical modeling; Intermittent drying; Energy consumption; Optimization; Drying characteristics; Paddy rice
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Energy efficiency investigation of intermittent paddy rice dryer: Modeling and experimental study
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Publisher
Database: Elsevier - ScienceDirect
Journal: Food and Bioproducts Processing - Volume 94, April 2015, Pages 275–283
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Bioengineering
Get Full-Text Now
Don't Miss Today's Special Offer
Price was $35.95
You save - $31
Price after discount Only $4.95
100% Money Back Guarantee
Full-text PDF Download
Online Support
Any Questions? feel free to contact us