The traditional vegetable drying (open-air/sun drying) method of harvesting of tomato, potato and onion in the Fogera District in Amhara regional state, Ethiopia, leads to loss of product, reduction in the quality of product and economic loss for the poor farmers. So, this experiment aimed to show the effectiveness of solar dryer technology by increasing the quality of the product in tomato, potato, and onion in Fogera district Northwest Ethiopia, 2018. A simple solar vegetable dryer is experimentally analyzed to alleviate the problem associated with vegetable processing in Woreta city. The first law of thermodynamics energy analysis was carried out to estimate the amount of useful energy gained from solar air dryer and energy utilization ratio of the drying chamber and the energy through drying box. The magnitude of the exergy inflow, outflow and exergy losses in the drying chamber during the drying process was determined by applying the second law of thermodynamics. The average solar drying efficiency was found to be 75.01% to 86.70% for tomato, 75.70% to 87.90% for potato and 58.7% to 85.5% for onion. Regrading the drying period, it took 33 h for tomato, 27 h for potato and 44 h for onion during the experimental test.

中文翻译：

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太阳能蔬菜干燥机的潜力评估和实验分析：以埃塞俄比亚北部为例

埃塞俄比亚阿姆哈拉州州Fogera区的西红柿，土豆和洋葱的传统蔬菜干燥（露天/日光干燥）方法导致产品流失，产品质量下降以及穷人的经济损失农民。因此，该实验旨在通过提高埃塞俄比亚西北部Fogera区的番茄，土豆和洋葱中的产品质量来证明太阳能干燥器技术的有效性，2018年，通过实验分析了一种简单的太阳能蔬菜干燥器以缓解与蔬菜相关的问题在Woreta市加工。进行热力学能量分析的第一定律，以估算从太阳能空气干燥器中获得的有用能量，干燥室的能量利用率以及通过干燥箱获得的能量。火用流入量，通过应用热力学第二定律确定干燥过程中干燥室内的流出和火用损失。番茄的平均日晒效率为75.01％至86.70％，马铃薯为75.70％至87.90％，洋葱为58.7％至85.5％。恢复干燥时间后，在实验测试中，番茄需要33小时，马铃薯需要27小时，洋葱需要44小时。