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Heat and mass transfer characteristics of indirect evaporate cooling system.

机译：间接蒸发冷却系统的传热和传质特性。

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摘要

Indirect evaporative air coolers show good promise in extending the energy savings (compared with compression air conditioning system) from arid, low humidity areas to more widespread climatic conditions. However, no systematic experiment had been done concerning the effect of the wettability of the plates on the effectiveness of the indirect evaporative cooling system. In this research, testing apparatus was built where only one secondary channel and two primary channels were used so that different surfaces could be easily tested to determine the system effectiveness and the heat transfer coefficient. The advantage of this experimental apparatus is that the materials of the heat exchanger can be easily changed in the test section instead of fabricating a complete heat exchanger for each test. Also, the experiment can be more closely controlled and more detailed data taken leading to a better understanding of the heat transfer mechanism.A dynamic contact analyzer was used to quantitatively specify the wetting properties in terms of advancing and receding contact angles and the water retention capacity of the different surfaces. It was found that most of the wicking surfaces had at least zero receding contact angles and some even had zero advancing contact angles. In this case, the water retention test had to be used to compare different surfaces. A relationship was found between the water retention ability and the system effectiveness.Two computer codes were written. One was to solve all the basic governing equations involved in the process of air flow in the isothermal flat plate channel with and without water evaporation on the surfaces. It was shown that with the water evaporating in the channel, the Nusselt number had been increased greatly. The other was to simulate the real process of this test. It was found out that the predicted effectiveness agrees well with the test results at conditions typical of actual operation of evaporative coolers.
机译：间接蒸发式空气冷却器在将节能（与压缩空调系统相比）从干旱，低湿度地区扩展到更广泛的气候条件方面显示出良好的前景。然而，关于板的可湿性对间接蒸发冷却系统的效果没有进行系统的实验。在这项研究中，建造了仅使用一个次要通道和两个主要通道的测试设备，以便可以轻松地测试不同的表面，从而确定系统效率和传热系数。该实验装置的优点在于，在测试部分中可以容易地改变热交换器的材料，而不是为每个测试制造完整的热交换器。此外，可以更严格地控​​制实验并获取更详细的数据，从而更好地了解传热机理。使用动态接触分析仪从前进和后退接触角以及保水量方面定量指定润湿性能不同的表面。已经发现，大多数芯吸表面具有至少为零的后退接触角，有些甚至具有为零的前进接触角。在这种情况下，必须使用保水测试来比较不同的表面。发现保水能力与系统有效性之间存在关系。编写了两个计算机代码。一种方法是求解等温平板通道中空气流动过程中表面有水蒸发和无水蒸发的所有基本控制方程。结果表明，随着通道中水的蒸发，Nusselt数大大增加。另一个是模拟该测试的真实过程。结果发现，在蒸发冷却器实际运行的典型条件下，预测的效果与测试结果非常吻合。

著录项

  • 作者

    Wang, Tiebin Allan.;

  • 作者单位

    Marquette University.;

  • 授予单位 Marquette University.;
  • 学科 Engineering Mechanical.
  • 学位 Ph.D.
  • 年度 1995
  • 页码 185 p.
  • 总页数 185
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

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