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Optimization on drying conditions of a solar electrohydrodynamic drying system based on desirability concept.

Dalvand MJ, Mohtasebi SS, Rafiee S - Food Sci Nutr (2014)

Bottom Line: Electrohydrodynamic (EHD) has been applied for drying of agricultural materials due to several advantages such as energy saving, low cost equipment, low drying temperatures, and superior material quality.The results indicated that increasing the applied voltage from 6 to 15 kV, moisture ratio (MR) decreased, though energy efficiency and energy consumption were increasing.On the other hand, field strength of 5.2 kV cm(-1) was the optimal point in terms of MR.

View Article: PubMed Central - PubMed

Affiliation: Department of Agricultural Machinery Engineering, Faculty of Agricultural Engineering and Technology, University of Tehran Karaj, Iran.

ABSTRACT
The purpose of this article was to present a new drying method for agricultural products. Electrohydrodynamic (EHD) has been applied for drying of agricultural materials due to several advantages such as energy saving, low cost equipment, low drying temperatures, and superior material quality. To evaluate this method, an EHD dryer based on solar (photovoltaic) energy was designed and fabricated. Moreover, the optimum condition for the EHD drying of kiwi fruit was studied by applying the Box-Behnken design of response surface methodology. The desirability function was applied for optimization in case of single objective and multiobjective functions. By using the multiobjective optimization method, maximum desirability value of 0.865 was obtained based on the following: applied voltage of 15 kV, field strength of 5.2 kV cm(-1), without forced air stream, and finally a combination of 17 discharge electrodes (needles). The results indicated that increasing the applied voltage from 6 to 15 kV, moisture ratio (MR) decreased, though energy efficiency and energy consumption were increasing. On the other hand, field strength of 5.2 kV cm(-1) was the optimal point in terms of MR.

No MeSH data available.


Response surface plots for investigating the effect of (A) applied voltage and number of discharge needles, and (B) applied voltage and air velocity on efficiency desirability function.
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fig05: Response surface plots for investigating the effect of (A) applied voltage and number of discharge needles, and (B) applied voltage and air velocity on efficiency desirability function.

Mentions: The main goal of the response surface is to find efficiently the optimum values of the variables such that the response is maximized. Each contour curve represents an infinitive number of combinations of two test variables with the other two maintained at their respective medium level. The maximum predicted value is indicated by the surface confined in the smallest ellipse in the contour diagram. Elliptical contours are obtained when there is a perfect interaction between the independent variables (Muralidhar et al. 2001). The effects of independent variables on optimizing the EHD drying process with desirability function were studied by plotting three-dimensional response surfaces against any two independent variables, while keeping another variable in its respective medium level. The three-dimensional response surfaces curves for the single response method are plotted in Figures4, 5, and 6. Responses include MR, energy consumption, and efficiency of power supply. The corresponding contour plots, represented by the projection of the response surfaces in the x and y planes, provide a straightforward determination of the effects of the independent variables on the dependent variable.


Optimization on drying conditions of a solar electrohydrodynamic drying system based on desirability concept.

Dalvand MJ, Mohtasebi SS, Rafiee S - Food Sci Nutr (2014)

Response surface plots for investigating the effect of (A) applied voltage and number of discharge needles, and (B) applied voltage and air velocity on efficiency desirability function.
© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4256582&req=5

fig05: Response surface plots for investigating the effect of (A) applied voltage and number of discharge needles, and (B) applied voltage and air velocity on efficiency desirability function.
Mentions: The main goal of the response surface is to find efficiently the optimum values of the variables such that the response is maximized. Each contour curve represents an infinitive number of combinations of two test variables with the other two maintained at their respective medium level. The maximum predicted value is indicated by the surface confined in the smallest ellipse in the contour diagram. Elliptical contours are obtained when there is a perfect interaction between the independent variables (Muralidhar et al. 2001). The effects of independent variables on optimizing the EHD drying process with desirability function were studied by plotting three-dimensional response surfaces against any two independent variables, while keeping another variable in its respective medium level. The three-dimensional response surfaces curves for the single response method are plotted in Figures4, 5, and 6. Responses include MR, energy consumption, and efficiency of power supply. The corresponding contour plots, represented by the projection of the response surfaces in the x and y planes, provide a straightforward determination of the effects of the independent variables on the dependent variable.

Bottom Line: Electrohydrodynamic (EHD) has been applied for drying of agricultural materials due to several advantages such as energy saving, low cost equipment, low drying temperatures, and superior material quality.The results indicated that increasing the applied voltage from 6 to 15 kV, moisture ratio (MR) decreased, though energy efficiency and energy consumption were increasing.On the other hand, field strength of 5.2 kV cm(-1) was the optimal point in terms of MR.

View Article: PubMed Central - PubMed

Affiliation: Department of Agricultural Machinery Engineering, Faculty of Agricultural Engineering and Technology, University of Tehran Karaj, Iran.

ABSTRACT
The purpose of this article was to present a new drying method for agricultural products. Electrohydrodynamic (EHD) has been applied for drying of agricultural materials due to several advantages such as energy saving, low cost equipment, low drying temperatures, and superior material quality. To evaluate this method, an EHD dryer based on solar (photovoltaic) energy was designed and fabricated. Moreover, the optimum condition for the EHD drying of kiwi fruit was studied by applying the Box-Behnken design of response surface methodology. The desirability function was applied for optimization in case of single objective and multiobjective functions. By using the multiobjective optimization method, maximum desirability value of 0.865 was obtained based on the following: applied voltage of 15 kV, field strength of 5.2 kV cm(-1), without forced air stream, and finally a combination of 17 discharge electrodes (needles). The results indicated that increasing the applied voltage from 6 to 15 kV, moisture ratio (MR) decreased, though energy efficiency and energy consumption were increasing. On the other hand, field strength of 5.2 kV cm(-1) was the optimal point in terms of MR.

No MeSH data available.