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| Heat Pump Drying Characteristics and Kinetic Model of Sea Cucumber Apostichopus japonicus |
| ZHANG Jingfeng1, ZHAO Haibo2, QIAO Lingmin3, DAI Jiaao4, WANG Haixiang5, QU Yong5 |
1. School of Civil Engineering, Yantai University, Yantai 264005, China;
2. School of Ocean, Yantai University, Yantai 264005, China;
3. Yantai Aiclunt New Energy Technology Co., Ltd., Yantai 264006, China;
4. College of Environmental Science and Engineering, Donghua University, Shanghai 201620, China;
5. Yantai Oceanaircorp Ground Source Air Conditioning Co., Ltd., Yantai 264004, China |
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Abstract In order to establish the drying kinetic model of sea cucumber Apostichopus japonicus and to investigate its heat pump drying characteristics, fresh sea cucumber with uniform size were selected for pretreatment. After pretreatment, the sea cucumber had dry basis moisture of 550%—650%. Six groups of sea cucumber in drying tests were carried out under different dry air temperature of 30, 35, 40 ℃ and 45 ℃, and relative humidity of 10%, 15% and 20%, and the drying wind speed of 2 m/s for 20 h in each test. The quality of sea cucumber was measured every 30 minutes. When the drying was terminated, the moisture of the dry basis of sea cucumber was varied from 30% to 75%. Based on the experimental data of heat pump drying of sea cucumber, eight commonly used drying models were improved. The coefficients in the drying model were fitted as the function of air temperature and relative humidity, and the coefficients in different models were obtained under four conditions. The fitting degree of different models was compared by using four evaluation indices. The results showed that the temperature and relative humidity of the drying air affected the heat pump drying process of sea cucumber. The higher the drying air temperature was, the lower the relative humidity and the faster the drying rate were. Page model was most suitable to describe the drying process of sea cucumber heat pump, and the simulation accuracy was higher when considering the influence of dry air temperature and relative humidity at the same time than when no considering or considering the influence of only one parameter.
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Received: 28 September 2020
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