远红外辅助热泵干燥对铁棍山药片品质影响

Study on Iron Yam Chips by Far-infrared-assisted Heat Pump Drying

为了研究远红外辅助热泵干燥对铁棍山药片干燥品质的影响,本研究分别在单一热泵和500、1 000、2 000W远红外辅助热泵4种条件下对铁棍山药片进行干燥处理,分析并比较了干燥曲线、水分有效扩散系数、硬度、脆度、体积收缩率、复水率和颜色等指标。结果表明,与单一热泵干燥相比,远红外辅助热泵条件下铁棍山药的水分有效扩散系数和硬度增加,且随着功率增大而增大。在4种处理中,单一热泵和1 000W远红外组合干燥对应2 000.0±10.0 g铁棍山药片的收缩率相对较小、硬度最小、脆度较高、复水能力最强、总色差变化最小。和单一热泵干燥相比,热泵和1 000W远红外组合干燥处理能耗降低约37.22%。结果表明,合适功率的远红外辅助热泵干燥是提高铁棍山药片干燥品质的有效方法。本研究为铁棍山药片生产提供了理论依据。

In order to evaluate the effects of far-infrared radiation assisted heat pump drying on the qualities of dried iron yam chips, which were dried under four conditions of heat pump alone or combining with far-infrared radiation with the power of 500, 1 000, and 2 000 W. Drying curves, effective diffusion coefficient, hardness, brittleness, shrinkage, rehydration and color of iron yam chips were analyzed and compared. The results showed that compared with single heat pump drying, the water effective diffusion coefficients and hardness of iron yam chips were improved under the conditions of far infrared assisted heat pump drying, and increased with the increase of far infrared power. In four kinds of treatments, iron yam chips （2 000.0 ＋ 10.0 g） treated by HP ＋ 1 000FIR showed less shrinkage, the lowest hardness, the highest brittleness, the biggest rehydration, and the lowest color change. Compared with single heat pump drying, the energy consumption of far infrared assisted heat pump drying at 1 000W was saved by 37.22%. Therefore, far infrared assisted heat pump drying with appropriate power is an effective method to improve the drying quality of iron yam chips. This research will provide some theoretical basis for practice.