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
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.
CHANG Z Y, ZHANG Y, ZHENG Z Q, et al. Deve-lopment status of the raft-cultivation harvesting devices for kelp[J]. Fishery Modernization, 2018, 45 (1): 40-48.(in Chinese)
JIANG T, HUANG Y X, OUYANG J, et al. Research advancements on drying techniques for macroalgaes[J]. Fishery Modernization, 2017, 44 (6): 80-88.(in Chinese)
[3]
JANGAM S.Advances in heat pump-assisted drying technology edited by vasile minea[J]. Drying Technology, 2017, 35(4):522-523.
BAI X S,LI B G. Study on drying characteristics and mathematical model for heat pump drying of mushroom[J]. Journal of Refrigeration, 2018, 39(4):42-48.(in Chinese)
LI X Y, LAN Q,XIA C F, et al. Studies on the heat pump drying characteristics and mathematical model of walnuts[J]. Acta Energiae Solaris Sinica, 2017, 38 (1): 91-97.(in Chinese)
JI C Y, JIANG S J,ZHANG B, et al. Heat pump drying properties of chili and optimization of technical parameters[J]. Transactions of the Chinese Society of Agricultural Engineering, 2017, 33 (13): 296-302.(in Chinese)
[7]
MUSTAFA A, ATAOLLAH K, BURAK A, et al. Ana-lysis of a new drying chamber for heat pump mint leaves dryer[J]. International Journal of Hydrogen Energy, 2017,42(28):18034-18044.
[8]
HII C L, LAW C L, SUZANNAH S. Drying kinetics of the individual layer of cocoa beans during heat pump drying[J]. Journal of Food Engineering, 2012, 108(2):276-282.
[9]
MORTEZAPOUR H, GHOBADIAN B, MINAEI S, et al. Saffron drying with a heat pumpassisted hybrid photovoltaicthermal solar dryer[J]. Drying Technology, 2012, 30(6):560-566.
SHI Q L,ZHAO Y,LI Z J,et al. Mathematical mode-ling on heat pump drying of horse mackerel[J]. Tran-sactions of the Chinese Society for Agricultural Machine-ry, 2009, 40 (5): 110-114.(in Chinese)
YANG W J,TANG D B,XU Y J, et al. Drying characteristics and mathematical modeling for heat pump drying of litchi[J]. Food Science, 2013, 34 (11): 104-108.(in Chinese)
SHENG J F, LI L, SUN J X, et al. Drying characteristics and mathematical modeling for heat pump drying of banana chips[J]. Food Research and Development, 2016,37(20):89-94.(in Chinese)
YANG J P, YAN S K, XU L J, et al. Drying characte-ristics and mathematical model of hot air drying for white seedless grape[J]. Food and Machinery, 2017,33(6):79-83. (in Chinese)
XUE Y M, LI B G. Drying characteristics and mathematical model for heat pump low temperature drying of tenebrio molitor[J]. Journal of Refrigeration, 2015,36(3):108-113. (in Chinese)