Influence of drying condition on the drying constants and activation energy for robusta coffee using heat pump drying

M. B. Fauzi, E. A. Kosasih, M. I. Dzaky
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Abstract

Heat pump drying (HPD) is a method of drying agricultural products which has great potential due to its high efficiency and energy savings. Coffee is a heat sensitive product, HPD was chosen as an alternative to existing drying methods for coffee processing. Understanding of the HPD process is important to know for optimizing the coffee drying process with HPD especially in drying characteristics. The purpose of this research is to determine the number for the drying rate constant and the energy of activation in coffee drying. The material used in this study was wet parchment Robusta coffee beans (Coffea canephora). The research was carried out experimentally for 5 h at 700 lpm air flow with varying drying air conditions by adjusting the drying temperature and specific humidity. The drying temperatures used were 60, 65, 70, 75, and 80 °C. The drying temperature is limited to 80 °C based on SNI 7467-2008. Variations in specific humidity are determined based on temperature settings in the refrigeration system of 10, 15, 20 °C and without a refrigeration system. The maximum drying rate constant was 10.69×10-3 s-1, achieved at a temperature of drying variation of 80 °C while a specific humidity of 6.16 g H2O/kg dry air, while the minimum activation energy value was 23.43 kJ/mol at the same specific humidity. The lowest drying rate constant value was 5.79×10-3 s-1, achieved at a temperature of drying variation of 60 °C and a specific humidity of 17.24 g H2O/kg dry air, while the greatest activation energy level was 26.18 kJ/mol at the same specific humidity.
使用热泵干燥罗布斯塔咖啡时,干燥条件对干燥常数和活化能的影响
热泵干燥(HPD)是一种干燥农产品的方法,因其高效节能而具有巨大潜力。咖啡是一种热敏性产品,因此选择 HPD 作为咖啡加工现有干燥方法的替代方法。了解 HPD 过程对于优化使用 HPD 的咖啡干燥过程非常重要,尤其是在干燥特性方面。本研究的目的是确定咖啡干燥过程中的干燥速率常数和活化能。本研究使用的材料是湿羊皮纸罗布斯塔咖啡豆(Coffea canephora)。研究在 700 升/分钟的气流条件下进行了 5 小时的实验,通过调节干燥温度和湿度来改变干燥空气条件。使用的干燥温度分别为 60、65、70、75 和 80 °C。根据 SNI 7467-2008,干燥温度限制在 80 °C。特定湿度的变化是根据制冷系统中 10、15、20 ° C 和无制冷系统的温度设置确定的。最大干燥速率常数为 10.69×10-3 s-1,是在干燥变化温度为 80 °C、比湿度为 6.16 g H2O/kg 干燥空气时实现的,而在相同比湿度下的最小活化能值为 23.43 kJ/mol。最低的干燥速率常数值为 5.79×10-3 s-1,是在干燥变化温度为 60 °C 和特定湿度为 17.24 g H2O/kg 干燥空气时实现的,而在相同的特定湿度下,最大的活化能值为 26.18 kJ/mol。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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