Kannan V Suresh, Arjunan T V, Vijayan S
Department of Mechanical Engineering, Coimbatore Institute of Engineering and Technology, Coimbatore, Tamilnadu India.
Department of Mechanical Engineering, School of Studies in Engineering and Technology, Guru Ghasidas Vishwavidyalaya (A Central University), Bilaspur, Chhattisgarh India.
J Food Sci Technol. 2021 Feb;58(2):777-786. doi: 10.1007/s13197-020-04595-z. Epub 2020 Jun 23.
In this present study, solid desiccant-based pressure-swing adsorption (PSA) dehumidifier was developed and the process parameters were optimized to deliver the air continuously at 0.1% relative humidity. Mint () leaves are tested to study the drying characteristics at varied flow rates of dehumidified air in the drying chamber. The initial moisture content of 5.059 g water/g dry matter have been reduced to a safe storage level in 360 min at 0.160 m/min volume low rate. The effective moisture diffusivity of the mint leaves was found in the range of 2.07534 × 10m/s to 3.45817 × 10m/s. The percentage of retention of ascorbic acid in dried mint leaves is increased by an increase in the volume flow rate of dry air and a maximum of 70.11% is achieved by 0.160 m/min. The colour measurement and chlorophyll content of the dried samples indicated that the desiccant dehumidified air dryers are suitable for heat sensitive green leafy vegetables.
在本研究中，开发了基于固体干燥剂的变压吸附（PSA）除湿机，并对工艺参数进行了优化，以便以0.1%的相对湿度持续输送空气。对薄荷（）叶进行了测试，以研究在干燥室内不同除湿空气流速下的干燥特性。在0.160米/分钟的体积低流速下，5.059克水/克干物质的初始水分含量在360分钟内已降至安全储存水平。薄荷叶片的有效水分扩散率在2.07534×10米/秒至3.45817×10米/秒范围内。干燥薄荷叶中抗坏血酸的保留百分比随着干燥空气体积流速的增加而增加，在0.160米/分钟时达到最大值70.11%。干燥样品的颜色测量和叶绿素含量表明，干燥剂除湿空气干燥机适用于对热敏感的绿叶蔬菜。
