Modeling and Optimization of Energy Parameters in Rosmarinus officinalis Drying with Microwave Pretreatment

Document Type : Research Article

Authors

1 Department of Biosystem Engineering, Faculty of Agriculture and Natural Resources, University of Mohaghegh Ardabili, Iran

2 Moghan College of Agriculture and Natural Resources, University of Mohaghegh Ardabili, Ardabil, Iran

3 PhD student, sari Agricultural Sciences and Natural Resouce University, sari, Iran

Abstract

Today, the use of pretreatment operations has been considered to reduce the time and energy with the aim of reducing the cost of agricultural products drying, such as medicinal plants. In this research, the modeling and optimization of energy parameters in the Rosmarinus officinalis drying with microwave pretreatment was evaluated using response surface methodology in three treatments (90 W for 5 min, 180 W for 2.5 min and 360 W for 1.5 min) and control (without pretreatment) in a convection dryer at temperatures of 40, 50 and 60 oC and the constant air flow velocity of 0.4 m/s. The results showed that with increasing power (from 90 to 360 W) and temperature (from 40 to 60 °C), the amount of drying coefficient increased quadratically. The value of energy efficiency, drying efficiency, thermal efficiency and convective efficiency increased by increasing of power and temperature from 90 to 180 W and 40 to 50 oC, respectively, but these amounts decreased by increasing of power and temperature from 180 to 360 W and 50 to 60oC, respectively. The increasing of the power (from 90 to 360 W) and temperature (from 40 to 50 °C) increased the amount of specific heat, specific power and specific energy consumption, while with increasing of temperatures from 50 to 60 °C, these values were reduced during quadratic equation. Based on modeling using RSM, optimum conditions for obtaining of the best energy parameters were determined to be microwave power of 360 W and drying temperature of 60 oC with desirability 99.5%.

Graphical Abstract

Modeling and Optimization of Energy Parameters in Rosmarinus officinalis Drying with Microwave Pretreatment

Highlights

  • Rosmarinus officinalis medicinal plants drying using microwave pretreatment under convection dryer
  • Modeling and optimization of thermodynamic and energy parameters during drying
  • Changes in these parameters during drying with quadratic equation
  • Obtaining of optimum conditions in microwave power of 360 W and drying temperature of 60 oC with desirability 99.5%.

Keywords

Main Subjects

References

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Innovative Food Technologies
Volume 7, Issue 1
November 2019
Pages 17-29

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History

  • Receive Date: 10 February 2019
  • Revise Date: 09 June 2019
  • Accept Date: 07 July 2019

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