Evaluation of drying of apple slices in a rotating-tray air dryer equipped with heat exchanger

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ghasemkhani hamid; RAFIEE SHAHIN; KEYHANI ALIREZA; Dalvand Mohammad jafar

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Paper Information

Journal: JOURNAL OF RESEARCHES IN MECHANICS OF AGRICULTURAL MACHINERY Year:2019 | Volume:7 | Issue:2 (13) Page(s): 9-19

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Information Journal Paper

Title

Evaluation of drying of apple slices in a rotating-tray air dryer equipped with heat exchanger

Author(s)

ghasemkhani hamid | RAFIEE SHAHIN | KEYHANI ALIREZA | Dalvand Mohammad jafar | Issue Writer Certificate

Keywords

Apple

Drying

Effective diffusivity

Heat exchanger

Rotating-tray air dryer

Abstract

In the present study, a pilot thin-layer rotary tray dryer was designed and fabricated and equipped with an air-to-air cross-flow plate Heat exchanger. Experiments were conducted to assess the effects of the experimental variables (air temperatures of 50, 65 and 80° C, air velocities of 1 and 2 m/s, tray rotation speeds of 0, 6, and 12 rpm with and without application of the Heat exchanger) on the thin layer Drying dynamics, effective moisture diffusivity and activation energy of Apple slices. According to the statistical results (RMSE, SSE and R2), the Midilli et al. model was the best fitted for describing the Drying behavior of Apple slices. Results indicated that temperature has the most important effect on Drying time (75. 5%), followed by air velocity (17. 6%) and tray rotation (7. 8%). The highest effective diffusion was found to be 8. 37×10-9 m2s-1 at air temperature, air velocity and speed rotation of 80 º C, 2 ms-1 and 12 rpm, respectively. The lowest effective diffusion was 2. 7×10-9 m2s-1 at air temperature, air velocity and speed rotation of 50 º C, 1 ms-1 and 0 rpm, respectively. The activation energy value of Apple slice varied between 16. 41-24. 16 kJ/mol. The use of Heat exchanger reduced energy consumption of the dryer by 33%. The results of this study can be applied for recovering the waste heat from exhaust air and improving the performance of forcedconvection dryers.

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APA: Copy

ghasemkhani, hamid, RAFIEE, SHAHIN, KEYHANI, ALIREZA, & Dalvand, Mohammad jafar. (2019). Evaluation of drying of apple slices in a rotating-tray air dryer equipped with heat exchanger. JOURNAL OF RESEARCHES IN MECHANICS OF AGRICULTURAL MACHINERY, 7(2 (13) ), 9-19. SID. https://sid.ir/paper/270440/en

Vancouver: Copy

ghasemkhani hamid, RAFIEE SHAHIN, KEYHANI ALIREZA, Dalvand Mohammad jafar. Evaluation of drying of apple slices in a rotating-tray air dryer equipped with heat exchanger. JOURNAL OF RESEARCHES IN MECHANICS OF AGRICULTURAL MACHINERY[Internet]. 2019;7(2 (13) ):9-19. Available from: https://sid.ir/paper/270440/en

IEEE: Copy

hamid ghasemkhani, SHAHIN RAFIEE, ALIREZA KEYHANI, and Mohammad jafar Dalvand, “Evaluation of drying of apple slices in a rotating-tray air dryer equipped with heat exchanger,” JOURNAL OF RESEARCHES IN MECHANICS OF AGRICULTURAL MACHINERY, vol. 7, no. 2 (13) , pp. 9–19, 2019, [Online]. Available: https://sid.ir/paper/270440/en

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