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首页> 外文期刊>Experimental Thermal and Fluid Science: International Journal of Experimental Heat Transfer, Thermodynamics, and Fluid Mechanics >Dynamic dip testing as a method to assess the condensate drainage behavior from the air-side surface of compact heat exchangers
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Dynamic dip testing as a method to assess the condensate drainage behavior from the air-side surface of compact heat exchangers

机译：动态浸入测试是一种评估紧凑型热交换器空气侧表面冷凝水排放行为的方法

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摘要

A new method to assess the condensate drainage behavior of the air-side surface of compact heat exchangers-dynamic dip testing-is introduced. The new method is shown to provide highly repeatable data for real-time drainage. Results from experiments with more than 20 flat-tube and round-tube-and-fin heat exchangers are presented, and the data clearly show geometrical effects such as the impact of the tube type on condensate drainage. By comparing the results from dip testing to wind-tunnel experiments for the same heat exchangers, we find dip testing can serve as a powerful tool for assessing the condensate retention behavior. The coils retaining the most and the least condensate in a steady-state wind-tunnel test, likewise held the most and the least in a dip test. However, different amounts of water are retained on the air-side surface during dip tests and wind-tunnel tests. A model based on gravity, surface tension and drag effects is developed to help understand and predict the drainage behavior of heat exchangers. The new model and experimental approach are useful in screening heat exchangers for condensate retention and for assessing off-cycle drainage behavior. (c) 2005 Elsevier Inc. All rights reserved.
机译：介绍了一种评估紧凑型热交换器空气侧表面冷凝水排放行为的新方法-动态浸入测试-。该新方法显示出可为实时排水提供高度可重复的数据。给出了使用20多个扁平管和圆管翅片式换热器进行实验的结果，数据清楚地显示了几何效应，例如管型对冷凝水排放的影响。通过将相同热交换器的浸入测试结果与风洞实验的结果进行比较，我们发现浸入测试可以作为评估冷凝水保留行为的有力工具。在稳态风洞测试中，线圈保留的冷凝物最多，最少，而在浸入测试中，线圈的冷凝物最多，最少。但是，在浸入测试和风洞测试期间，空气侧表面会保留不同量的水。建立了基于重力，表面张力和阻力效应的模型，以帮助理解和预测热交换器的排水性能。新的模型和实验方法可用于筛选热交换器，以保留冷凝水并评估循环外排水行为。 （c）2005 Elsevier Inc.保留所有权利。

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