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首页> 外文期刊>International Journal of Heat and Mass Transfer >Experimental performance of bubble column humidifier and dehumidifier under varying pressure
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Experimental performance of bubble column humidifier and dehumidifier under varying pressure

机译：鼓泡塔加湿器和除湿器在不同压力下的实验性能

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摘要

The performance of bubble column humidifier and dehumidifier is investigated experimentally under sub-atmospheric pressures for the humidifier and elevated pressures for the dehumidifier. The bubble columns examined are of 10 cm diameter and 25 cm height. They are equipped with internal cooling and heating coils and the air is sparged through perforated plates at its bottom. The pressure tested in the humidifier ranges from 7 psia (0.48 bar) to 15 psia (1.03 bar), while the pressure tested in the dehumidifier ranges from 15 psia (1.03 bar) to 30 psia (2.07 bar). In addition, the water level in the bubble columns and the superficial velocity were varied in the range of 5-7 cm and 2-20 cm/s respectively. The performance was evaluated by measuring the total heat transfer rate and the effectiveness. Moreover, the experimental values of the mass transfer coefficient are presented as a function of the superficial velocity and pressure. The results show that operating the bubble column humidifier at sub-atmospheric pressure enhances the total heat transfer by about 35% and the effectiveness by about 7.1%. However, operating the dehumidifier at elevated pressures, results in higher heat transfer rate by about 27% but lower effectiveness by about 3.2%. It was demonstrated that the liquid height in the column has no significant effect on the performance however; the superficial velocity increases both the heat transfer and effectiveness for the humidifier and dehumidifier. Moreover, a modified effectiveness-number of transfer units (ε-NTU) model for counter flow cooling tower was found to agree well with the experimental results of the effectiveness and NTU. The ε-NTU model is an effective approach to analyze the performance of bubble column humidifier and dehumidifier.
机译：对鼓泡塔加湿器和除湿器的性能进行了实验，研究了在低于大气压的加湿器和升高的除湿器压力下。检查的气泡柱直径为10厘米，高度为25厘米。它们配有内部冷却和加热盘管，空气通过其底部的多孔板喷射。在加湿器中测试的压力范围为7 psia（0.48 bar）至15 psia（1.03 bar），而在除湿器中测试的压力范围为15 psia（1.03 bar）至30 psia（2.07 bar）。另外，鼓泡塔中的水位和表面速度分别在5-7cm / s和2-20cm / s的范围内变化。通过测量总传热速率和有效性来评估性能。此外，传质系数的实验值作为表面速度和压力的函数给出。结果表明，在低于大气压的条件下运行鼓泡塔加湿器可使总传热提高约35％，效率提高约7.1％。然而，在升高的压力下操作除湿器导致较高的传热速率约27％，但效率较低约3.2％。结果表明，塔中的液体高度对性能没有显着影响。表面速度提高了加湿器和除湿器的传热效率。此外，发现改进的逆流冷却塔传输单元有效性数（ε-NTU）模型与有效性和NTU的实验结果非常吻合。 ε-NTU模型是分析鼓泡塔加湿器和除湿器性能的有效方法。

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