Microwave drying of mallow leaves, drying kinetics and energy analyses

Seyedabadi, Esmaeel; Aran, Mehdi; Rahimian Boogar, Abdolrahman

doi:10.22034/aes.2022.339398.1034

Document Type : Original research article

Authors

¹ Department of Agronomy, College of Agriculture, University of Zabol, Zabol, Iran

² Department of Horticultural Science,Faculty of Agriculture, University of Zabol, Zabol, Iran

³ Department of Horticultural Science, Faculty of Agriculture, University of Zabol, Zabol, Iran

https://doi.org/10.22034/aes.2022.339398.1034

Abstract

The drying characteristics of mallow (Malva sylvestris L.) in a microwave dryer were examined at different microwave power levels. To dry 30 g of mallow leaves, microwave power levels of 360, 450, 540, 720, and 900 W were used. The initial moisture content of samples was 6.31±0.01 g water/ g dry base. To determine the kinetic parameters, which were calculated by comparing the ratio of the difference between the initial and final moisture contents to the equilibrium moisture content, experimental data were fitted to seven distinct models. At various microwave power levels, the moisture diffusivity and energy consumption were measured. Based on the results, increasing microwave power from 360 to 900 W resulted in a drying time reduction between 14 and 5 minutes. A comparison of the proposed models demonstrated that the logarithmic model (MR= a.exp(-k.t)+b) provided the best fit because it had the highest coefficient of determination (R²), the lowest sum of squared errors (SSE), and the lowest root mean square error (RMSE). This model can therefore be used to estimate the moisture content of mallow leaves during microwave drying. Also, the maximum and minimum energy consumptions for drying with 360 W and 720 W microwaves were 84.0 and 67.5 W.h, respectively. Moreover, the effective diffusivity of mallow leaves varied from 1.098×10⁻¹⁰ to 3.532×10⁻¹⁰ m²/s for different microwave powers.

Highlights

The drying characteristics of mallow in a microwave dryer were investigated.
The kinetic parameters were calculated by comparing the difference between the initial and final moisture contents to the equilibrium moisture content.
Increasing microwave power from 360 to 900 W reduced drying time by 14 to 5 minutes.
The logarithmic model had the best fit, with the highest R², lowest SSE, and lowest RMSE.

Keywords

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Journal of Emergy, Life Cycle and System Analysis in Agriculture

Microwave drying of mallow leaves, drying kinetics and energy analyses

References

References

Volume 2, Issue 1 - Serial Number 2
June 2022
Pages 53-60

Microwave drying of mallow leaves, drying kinetics and energy analyses

References

References

Volume 2, Issue 1 - Serial Number 2June 2022Pages 53-60

Volume 2, Issue 1 - Serial Number 2
June 2022
Pages 53-60