Evaluation of a simulation model in predicting the drying parameters for deep-bed paddy drying

A simulation model for deep-bed batch drying of paddy was developed to predict the profiles of grain moisture content, grain temperature, air temperature and air humidity during the drying process. In order to evaluate the validity of this model, a laboratory-scale deep-bed batch dryer was designed and fabricated. Comprehensive drying experiments were carried out in three replications under different drying conditions with two independent drying variables, namely, drying air temperature (at two levels of 45 and 50^oC) and air mass flow rate (at three levels of 0.1, 0.16 and 0.22kgm^-^2s^-^1). Good agreement was found between the simulation results and the experimental data. After validation of the model, the dryer performance was optimized by minimizing specific energy consumption under identical moisture removal using the simulation model. Based on this criterion, the treatment with mass flow rate of 0.03kgm^-^2s^-^1 and air temperature of 35^oC was found to be the optimal drying condition.

[1]  I. N. Widiasa,et al.  MODELING AND SIMULATION OF DEEP-BED GRAIN DRYERS , 2001 .

[2]  M. Kalbasi.  Heat and Moisture Transfer Model for Onion Drying , 2003 .

[3]  N. Mandas,et al.  PH—Postharvest Technology: Numerical Simulation Static-Bed Drying of Barley , 2002 .

[4]  Digvir S. Jayas,et al.  Grain Drying: Theory and Practice , 1998 .

[5]  Siaw Kiang Chou,et al.  PH—Postharvest Technology: Modelling the Moisture and Temperature Distribution within an Agricultural Product undergoing Time-varying Drying Schemes , 2002 .

[6]  W. E. Muir,et al.  Modelling the Superheated-steam Drying of a Fixed Bed of Brewers’ Spent Grain , 2004 .

[7]  Antonio López,et al.  SIMULATION OF DEEP BED DRYING OF HAZELNUTS , 1998 .

[8]  Hung Jung Shei,et al.  COMPUTER SIMULATION ON INTERMITTENT DRYING OF ROUGH RICE , 2002 .

[9]  Abdolreza Karbassi,et al.  Sustainability of energy production and use in Iran , 2007 .

[10]  J. J. Barker.  HEAT TRANSFER IN PACKED BEDS , 1965 .

[11]  Somchart Soponronnarit,et al.  A MATHEMATICAL MODEL FOR CONTINUOUS DRYING OF GRAINS IN A SPOUTED BED DRYER , 2002 .

[12]  J. R. Sharp.  A review of low temperature drying simulation models , 1982 .

[13]  J. L. Parry,et al.  Mathematical modelling and computer simulation of heat and mass transfer in agricultural grain drying: A review , 1985 .

[14]  C. B. Akritidis,et al.  A Model to Simulate Chopped Alfalfa Drying in a Fixed Deep Bed , 2004 .

[15]  T. Afzal,et al.  Thin-Layer Infrared Radiation Drying of Rough Rice , 1997 .

[16]  Somchart Soponronnarit,et al.  A TWO-REGION MATHEMATICAL MODEL FOR BATCH DRYING OF GRAINS IN A TWO-DIMENSIONAL SPOUTED BED , 2001 .

[17]  Lalit R. Verma,et al.  Deep-Bed Rice Drying Simulation Using Two Generalized Single-Layer Models , 1986 .

[18]  F. W. Bakker-Arkema,et al.  Drying and Storage Of Grains and Oilseeds , 1992 .