Optimization of air drying of foods

Abstract Several optimization problems related with the air drying of foods are studied: maximization of nutrient or enzyme retention, minimization of process time, maximization of nutrient retention with a constraint on the final retention of an enzyme, and maximization of energy efficiency. These problems are successfully solved for three different model systems using an stochastic optimal control algorithm. The air dry bulb temperature and its relative humidity are used as the control variables. The optimal policies obtained are significantly superior to the classical processes in several cases. This suggests further research in order to experimentally evaluate these advantages.

[1]  Ireneusz Zbicinski,et al.  MULTIOBJECTIVE OPTIMIZATION OF DRYING PROCESS , 1989 .

[2]  D. Marinos-Kouris,et al.  Finite element simulation of drying of agricultural products with volumetric changes , 1991 .

[3]  S. Whitaker,et al.  Drying of cellular material—I. A mass transfer theory , 1988 .

[4]  D. Himmelblau,et al.  Optimization of Chemical Processes , 1987 .

[5]  K. Riet,et al.  Inactivation of thermostable α-amylase during drying , 1991 .

[6]  R. Ouhab,et al.  Optimal Drying Conditions of Grains , 1985 .

[7]  D. Pei,et al.  A mathematical model of drying processes , 1989 .

[8]  K. Luyben,et al.  A simplified calculation method applied to enzyme inactivation during drying , 1985, Biotechnology and bioengineering.

[9]  Alberto M. Sereno,et al.  A simplified model for the prediction of drying rates for foods , 1990 .

[10]  Sergio A. Giner,et al.  Modelling of Wheat Drying in Fluidized Beds , 1987 .

[11]  Israel Saguy,et al.  Applications of optimization in food dehydration [Mathematical modeling]. , 1982 .

[12]  K. Luyben,et al.  Enzyme degradation during drying , 1982, Biotechnology and bioengineering.

[13]  F. W. Bakker-Arkema,et al.  Simulation For Design of Commercial Concurrentflow Grain Dryers , 1978 .

[14]  J. K. Liou,et al.  An approximate method for the nonlinear diffusion problem with a power relation between diffusion coefficient and concentration—II. Computation of concentration profiles , 1982 .

[15]  Julio R. Banga,et al.  Optimization of the Thermal Processing of Conduction-Heated Canned Foods: Study of Several Objective Functions , 1991 .

[16]  Marcus Karel,et al.  PREDICTION OF ASCORBIC ACID RETENTION DURING DRYING I. MOISTURE AND TEMPERATURE DISTRIBUTION IN A MODEL SYSTEM , 1980 .

[17]  Qin Zhang,et al.  AN OPTIMIZATION OF INTERMITTENT CORN DRYING IN A LABORATORY SCALE THIN LAYER DRYER , 1991 .

[18]  Israel Saguy,et al.  MINIMIZING ASCORBIC ACID LOSS DURING AIR DRYING WITH A CONSTRAINT ON ENZYME INACTIVATION FOR A HYPOTHETICAL FOODSTUFF , 1983 .

[19]  Marcus Karel,et al.  REDICTION OF ASCORBIC ACID RETENTION DURING DRYING II. SIMULATION OF RETENTION IN A MODEL SYSTEM , 1980 .

[20]  K. Luyben,et al.  Drying of food materials: a review of recent developments , 1978 .

[21]  L. B. Evans,et al.  Optimization theory and its application in food processing , 1982 .

[22]  T. Chang,et al.  Application of Optimal Control Strategy to Hybrid Microwave and Radiant Heat Freeze Drying System , 1985 .

[23]  I. Saguy,et al.  Advances in Optimization of Food Dehydration with Respect to Quality Retention , 1985 .

[24]  N. Sakai,et al.  Two Dimensional Simultaneous Heat and Moisture Transfer in Composite Food , 1992 .

[25]  A. I. Liapis,et al.  Optimal control of a freeze dryer—I Theoretical development and quasi steady state analysis , 1979 .

[26]  Theodore P. Labuza,et al.  Nutrient losses during drying and storage of dehydrated foods , 1972 .

[27]  Shuichi Yamamoto,et al.  Drying of enzymes : enzyme retention during drying of a single droplet , 1992 .

[28]  I. Saguy,et al.  Dynamic Optimization of Dehydration Processes: Minimizing Browning in Dehydration of Potatoes , 1983 .

[29]  Israel Saguy,et al.  Optimization of Nutrient Retention During Processing: Ascorbic Acid in Potato Dehydration , 1984 .