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Drying characteristics and mathematical model of kelp junction heat pump |
1. School of Energy and Power Engineering, Jiangsu University, Zhenjiang, Jiangsu 212013, China; 2. Zhenjiang Jianke Engineering Quality Inspection Center Co., Ltd., Zhenjiang, Jiangsu 212000, China |
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Abstract Using double-evaporator normally closed heat pump drying technology, the kelp was used as material to investigate the drying characteristics and moisture ratio change law of the heat pump under different drying temperatures of 35, 40, 45 and 50 ℃ and loading densities of 8.29, 32.29 and 42.71 kg?m-3. The experimental data were fitted to obtain the drying mathematical model. The results show that in the range of 35 to 50 ℃, with the increasing of drying temperature, the unit dehumidification energy consumption is increased with latter decreasing, while the drying time is decreased with latter increasing. In the range of 8.29 to 42.71 kg?m-3, the larger the loading density and the drying time are, the larger the unit dehumidification energy consumption ratio is. Within the experimental conditions, the drying temperature of 45 ℃ and the loading density of 32.29 kg?m-3 are the optimal drying process parameters for the drying of the kelp junction heat pump, and the unit dehumidification energy consumption ratio is 1.625 kg?(kW?h)-1 with drying time of 260 min. The predicted values of the Page model are basically consistent with the experimental results, which can be used to predict the drying characteristics of kelp junction heat pump and the change law of water ratio with time.
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Received: 11 October 2018
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