Effect of ambient parameters change on mint leaves solar drying

IF 0.9 Q4 CHEMISTRY, MULTIDISCIPLINARY Acta Chimica Slovaca Pub Date : 2021-01-01 DOI:10.2478/acs-2021-0003
A. Noori, Mohammad Jafar Royen, J. Haydary
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引用次数: 4

Abstract

Abstract This study investigates the effect of ambient conditions change on mint leaves solar drying performance and product water activity. Two drying methods, active indirect solar drying (AISD) and open sun drying (OSD) were compared while the experiments were carried out at specific dry climate conditions. During the experimental days, temperature varied from 20 to 30 °C, air relative humidity from 14 to 28.8 % and ambient pressure was around 82 kPa. The effect of air relative humidity change during the day on the rehydration of the product during the drying process was observed. After 7 h of drying, moisture content of mint leaves decreased from 85.29 % to 5.38 % in the AISD and 7.42 % in the OSD system. The 0.97 initial water activity decreased to 0.195 in AISD and 0.79 in OSD. Rehydration during the evening hours caused an increase in product water activity from 0.2 to 0.51. Changes of ambient conditions such as temperature and air relative humidity during the day can significantly affect water activity of dried product due to its rehydration and thus increase the risk of product spoilage.
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环境参数变化对薄荷叶日光干燥的影响
摘要本研究探讨了环境条件变化对薄荷叶太阳能干燥性能和产品水分活性的影响。在特定的干燥气候条件下进行实验,比较了活性间接太阳干燥(AISD)和开放太阳干燥(OSD)两种干燥方法。在实验期间,温度在20至30°C之间变化,空气相对湿度在14至28.8%之间变化,环境压力约为82 kPa。观察了白天空气相对湿度变化对干燥过程中产品再水合的影响。干燥7小时后,在AISD和OSD系统中,薄荷叶的含水量分别从85.29%和7.42%下降。AISD中0.97的初始水活度降至0.195,OSD中降至0.79。晚上的补水使产品水的活性从0.2增加到0.51。白天环境条件(如温度和空气相对湿度)的变化会显著影响干燥产品的水分活度,因为它会重新水合,从而增加产品变质的风险。
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来源期刊
Acta Chimica Slovaca
Acta Chimica Slovaca CHEMISTRY, MULTIDISCIPLINARY-
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12.50%
发文量
11
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