Food and Fermentation Industries >

2023 , Vol. 49 >Issue 20: 124 - 132

DOI: https://doi.org/10.13995/j.cnki.11-1802/ts.033061

Effect of heat pump-high voltage electric field combined drying on drying characteristics of yam slices

  • MENG Zhaofeng ,
  • CUI Xiangna ,
  • LIU Yin ,
  • WANG Yiman ,
  • HU Rusheng ,
  • DU Chenyang ,
  • WANG Shun
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  • (School of Energy and Environmental, Zhongyuan University of Technology, Zhengzhou 451191, China)

Received date: 2022-07-21

  Revised date: 2022-08-30

  Online published: 2023-11-20

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Abstract

To study the drying characteristics of heat pump-high voltage electric field combined drying, the drying experiments of yam slices were carried out at the temperature of 50-60 ℃, a voltage of 80-100 kV and a wind speed of 1-3 m/s. Results showed that the combined drying of yam slices was a falling rate drying process. The drying rate, drying time, specific energy consumption and sensory score of the single heat pump drying at 55 ℃ and 60 ℃ were similar to that of the combined drying at 50 ℃ and 55 ℃, respectively. It can be seen that combined drying could effectively reduce the drying temperature by about 5 ℃. Compared with single heat pump drying, the specific energy consumption was reduced by about 19%. With the increase in temperature, the sensory score of combined drying was higher about 10%-28% than that of single heat pump drying. One-way analysis of variance (ANOVA) showed that the rehydration rate of 90 kV combined drying was the highest, which was 9.0% higher than that of single heat pump drying. The total phenolic contents of 80 kV, 90 kV, and 100 kV were 0.5%, 19.6%, and 12.3% higher than that of single heat pump drying, respectively. With the increase in wind speed, the sensory characteristics of 3 m/s were 21.0% higher than that of 1 m/s. Through the analysis of the model parameters, it was found that the Page model was more in line with the variation rule of the drying experimental data, which could well describe the variation rule of the moisture ratio. It provided practical guidance for optimizing the process of heat pump-high voltage electric field combined drying and improving the drying efficiency and product quality.

Key words： high voltage electric field drying; heat pump drying; combined drying; total phenolic; mathematical model

Cite this article

MENG Zhaofeng , CUI Xiangna , LIU Yin , WANG Yiman , HU Rusheng , DU Chenyang , WANG Shun . Effect of heat pump-high voltage electric field combined drying on drying characteristics of yam slices[J]. Food and Fermentation Industries, 2023 , 49(20) : 124 -132 . DOI: 10.13995/j.cnki.11-1802/ts.033061

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