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Agricultural Process and Food Engineering : Original Article ; Drying Characteristics of Sea Tangle Using Combination of Microwave and Far-Infrared Dryer
( Chung Su Han ) , ( Tae Hwan Kang ) , ( Jeong Hyeon Lee ) , ( Jin Ho Won ) , ( Byeong Hyo Cho ) , ( Sung Chan Cho )
UCI I410-ECN-0102-2017-520-000101102

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℃ and 100℃) 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℃ 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℃ 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℃ 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℃ by a far-infrared dryer.

Introduction
Materials and Methods
Results and Discussion
Conclusions
Conflict of Interest
Acknowledgement
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