Journal of Biosystems Engineering

Korean Society for Agricultural Machinery (한국농업기계학회)
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Drying Characteristics of Sea Tangle Using Combination of Microwave and Far-Infrared Dryer

  • Han, Chung-Su (Department of Biosystems Engineering, Chungbuk National University) ;
  • Kang, Tae-Hwan (Major in Bio-Industry Mechanical Engineering, Kongju National University) ;
  • Lee, Jeong-Hyeon (Laboratory of Agricultural and Food Process Engineering, Hokkaido University) ;
  • Won, Jin-Ho (Department of Biosystems Engineering, Chungbuk National University) ;
  • Cho, Byeong-Hyo (Department of Biosystems Engineering, Chungbuk National University) ;
  • Cho, Sung-Chan (Department of Biosystems Engineering, Chungbuk National University)
  • Received : 2016.02.03
  • Accepted : 2016.02.24
  • Published : 2016.03.01
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Abstract

Purpose: The present study is aimed at examining the drying characteristics of sea tangle through a combination of microwave and far-infrared drying experiment and finding the optimal drying conditions. Methods: Sea tangle was cleaned and cut into fine pieces (5mm) before they were subjected to combinational drying by microwave and far-infrared ray. The amount of specimen per drying is 2 kg. The finely cut pieces of sea tangle were preheated in a microwave dryer for three different lengths of time (10, 15, and 20 min). Subsequently, they were dried using a far-infrared dryer at tow temperatures ($90^{\circ}C$ and $100^{\circ}C$) at an air velocity of 0.8 m/s until the final moisture content reduced to 10%. Results: Sea tangle dried under the condition of 20 min of preheating in the microwave dryer and drying at $100^{\circ}C$ by the far-infrared dryer. Of the drying models verified in this study, the logarithmic model showed high accuracy with the coefficient of determination $R^2>0.7825$ and RMSE<0.1095. The rehydration ratio of sea tangle was the highest (12.87 g water/g dry matter) under the condition of 15 min of preheating in the microwave dryer and drying at $100^{\circ}C$ by the far-infrared dryer. The energy consumption for the combination of microwave and far-infrared drying was the lowest (4.78 kJ/kg water) under the condition of 20 min of preheating in the microwave dryer and drying at $100^{\circ}C$ by the far-infrared dryer. Conclusions: Considering the drying time, discoloration during drying, rehydration ratio, and energy consumption for the drying of sea tangle, the optimal drying conditions for high-quality sea tangle are 15 min of preheating in a microwave dryer and drying at $100^{\circ}C$ by a far-infrared dryer.

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