用于苦瓜片干燥的带有单通道太阳能空气加热器的混合温室太阳能干燥器的数值建模:有限元分析

LALAN KUMAR, OM PRAKASH, VIJAY KUMAR PANDEY
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引用次数: 0

摘要

本研究的目的是开发一个有限元模型,用于解释配备单通道太阳能空气加热器的混合温室干燥机在干燥苦瓜片时的干燥性能。该模型利用有限元法(FEM)求解了一组偏微分方程(PDE),描述了干燥过程中的热量和质量的综合传递过程。三维有限元模型直观地显示了苦瓜样品中水分的空间分布。模型中使用的网格由具有小尺寸和二阶几何形状的拉格朗日三角形有限元组成。进行了随时间变化的分析,以捕捉 5 小时干燥过程中水分含量的变化。模型预测作物和地面的最高温度分别为 60.10°C 和 77.20°C,干燥效率为 42.91%。干燥室内的相对湿度为 30.4%。能量效率和放能效率分别为 80.09% 和 53.83%。根据实验数据对预测结果进行了验证,发现混合温室太阳能干燥器内部温度适中,是干燥苦瓜片的合适选择,同时保持了环境的可持续发展。
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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Numerical modeling of a hybrid greenhouse solar dryer with single-pass solar air heater for bitter gourd flakes drying: a finite element analysis

The objective of this study was to develop a finite element model that explains the drying performance of a hybrid greenhouse dryer equipped with a single-pass solar air heater for drying of bitter gourd flakes. The model utilized the finite element method (FEM) to solve a set of partial differential equations (PDEs) that describe the combined heat and mass transfer process during drying. The 3-dimensional finite element model provided a visual representation of the spatial distribution of moisture within the bitter gourd sample. The mesh used in the model consisted of Lagrange triangle finite elements with small sizes and second-order geometry shapes. A time-dependent analysis was performed to capture changes in moisture content during the 5-hour of drying. The model predicted maximum crop and ground temperatures of 60.10°C and 77.20°C, respectively, with a drying efficiency of 42.91%. The relative humidity inside the drying chamber was 30.4%. The energy and exergy efficiencies were determined to be 80.09% and 53.83%, respectively. The predicted results were validated against experimental data and it was found that the hybrid greenhouse solar dryer, with moderate inside temperatures, is a suitable option for bitter gourd flakes drying while maintaining environmental sustainability.

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