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首页> 外文期刊>International Journal of Heat and Mass Transfer >Multistage relative humidity control strategy enhances energy and exergy efficiency of convective drying of carrot cubes
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Multistage relative humidity control strategy enhances energy and exergy efficiency of convective drying of carrot cubes

机译：多级相对湿度控制策略可提高胡萝卜块对流干燥的能量和火用效率

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摘要

Industrial drying is one of the most energy intensive unit operations encountered in most industrial sectors. Therefore, much effort has been devoted to energy savings in drying. Most methods applied to convective drying are based on heat recovery from dryer exhaust. However, there are major limitations on how much of the energy can be recovered cost-effectively. Here a new concept based on the relative humidity (RH) control of convective drying of carrot cubes was evaluated with the purpose of enhancing the energy and exergy efficiency of drying. Numerical simulations of heat and mass transfer were performed to investigate hot air drying behavior of carrot cubes. The model fitted well the moisture ratio and the material temperature data with average relative errors of 6.5% and 0.8%, respectively. Results show that both the energy loss caused by exhaust air and the irreversibility loss of thermodynamic process decreased with increase in RH of the drying medium from 4% to 40%. Multistage relative humidity control strategy improved both the drying rate and exergy efficiency. Among the tested schemes, the three-stage RH control strategy, i.e. (1) RH of 40% for 2 h, (2) RH of 20% for 2 h and (3) RH of 4% for 3.5 h was found to be the strategy with the highest exergy efficiency (53.3%). It was almost three times higher than that for constant 4% RH values.
机译：工业干燥是大多数工业部门中遇到的能耗最高的单元操作之一。因此，已经致力于节省干燥中的能量。对流干燥的大多数方法都是基于干燥机排气中的热量回收。但是，对于可以成本有效地回收多少能量有很大的限制。在此基于胡萝卜对流干燥的相对湿度（RH）控制的新概念进行了评估，目的是提高干燥的能量和火用效率。进行了传热和传质的数值模拟，以研究胡萝卜块的热风干燥行为。该模型很好地拟合了水分比和物料温度数据，平均相对误差分别为6.5％和0.8％。结果表明，随着干燥介质的相对湿度从4％增加到40％，由排气引起的能量损失和热力学过程的不可逆损失都降低了。多级相对湿度控制策略提高了干燥速度和火用效率。在测试的方案中，发现了三阶段RH控制策略，即（1）RH为2％的RH为2％，（2）RH为2 h的RH为20％，（3）RH为4小时的4％RH。火用效率最高的策略（53.3％）。它几乎是恒定4％RH值的三倍。

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  • 来源
    《International Journal of Heat and Mass Transfer》 |2020年第3期|119231.1-119231.11|共11页
  • 作者

  • 作者单位

    College of Engineering China Agricultural University P.O. Box 194. 17 Qinghua Donglu Beijing 100083 China Engineering Research Center for Modern Agricultural Equipment & Facilities Ministry of Education Beijing 100083 China;

    Department of Systems Engineering University of Warmia and Mazury in Olsztyn Poland;

    College of Biology Science and Engineering Hebei University of Economics and Business Xinhua District Shijiazhuang Hebei 050061 China;

    Department of Bioresource Engineering McGill University Ste. Anne de Bellevue Quebec. Canada;

    College of Food and Bioengineering. Henan University of Science and Technology Luoyang 471003 China;

  • 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

    Exergy efficiency; Energy efficiency; Numerical simulation; Carrot drying; Heat and mass transfer; Relative humidity;

    机译：火用效率;能源效率;数值模拟;胡萝卜干燥;传热传质;相对湿度;

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