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Design and performance evaluation of a new hybrid solar dryer for banana

机译：新型香蕉混合太阳能干燥机的设计与性能评估

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摘要

A hybrid solar dryer was designed and constructed using direct solar energy and a heat exchanger. The dryer consists of solar collector, reflector, heat exchanger cum heat storage unit and drying chamber. The drying chamber was located under the collector. The dryer was operated during normal sunny days as a solar dryer, and during cloudy day as a hybrid solar dryer. Drying was also carried out at night with stored heat energy in water which was collected during the time of sun-shine and with electric heaters located at water tank. The efficiency of the solar dryer was raised by recycling about 65% of the drying air in the solar dryer and exhausting a small amount of it outside the dryer. Under Mid-European summer conditions it can raise up the air temperature from 30 to 40 ℃ above the ambient temperature. The solar dryer was tested for drying of ripe banana slices. The capacity of the dryer was to dry about 30 kg of banana slices in 8 h in sunny day from an initial moisture content of 82% to the final moisture content of 18% (wb). In the same time it reduced to only 62% (wb) moisture content in open sun drying method. The colour, aroma and texture of the solar dried products were better than the sun drying products.
机译：使用直接太阳能和热交换器设计和制造了一种混合式太阳能干燥机。该干燥机由太阳能收集器，反射器，热交换器兼储热单元和干燥室组成。干燥室位于收集器下方。该干燥机在正常晴天作为太阳能干燥机运行，在阴天期间作为混合太阳能干燥机运行。夜间也使用储存在水中的热能进行干燥，该热能是在阳光照射期间收集的，并使用水箱中的电加热器。通过将太阳能干燥器中约65％的干燥空气再循环并将少量空气排到干燥器外，可以提高太阳能干燥器的效率。在欧洲中部夏季条件下，空气温度可以从周围温度升高30到40℃。测试了太阳能干燥机对成熟香蕉片的干燥。干燥机的能力是在晴天在8小时内干燥约30公斤香蕉片，其初始水分含量为82％至最终水分含量为18％（wb）。同时，在露天晒干法中，水分含量仅降低到62％（wb）。太阳干燥产品的颜色，香气和质地优于太阳干燥产品。

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  • 来源
    《Energy Conversion & Management》 |2010年第4期|P.813-820|共8页
  • 作者

    B.M.A. Amer; M.A. Hossain; K. Gottschalk;

  • 作者单位

    Agricultural Engineering Department, Faculty of Agriculture, Cairo University, Giza 12613, Egypt;

    FMP Engineering Division, Bangladesh Agricultural Research Institute, Gazipur 1701, Bangladesh;

    Leibniz-Institut fuer Agrartechnik Potsdam-Bornim, 100 Max-Eyth-Allee, 14467 Potsdam, Germany;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    banana drying; heat exchanger; reflector; solar dryer; storage energy;

    机译：香蕉干燥;热交换器;反射器太阳能干燥机储能;

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