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首页> 外文期刊>International Journal of Heat Exchangers >Air Side Fouling of Compact Heat Exchangers
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Air Side Fouling of Compact Heat Exchangers

机译：紧凑型热交换器的空气侧结垢

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摘要

This paper reports a study into the fouling of heat exchangers caused by large particles. This type of fouling is a major problem in the agricultural and off highway environments. The fouling mechanism caused by large particles has been found to be fundamentally different to that caused by small particles. An experimental rig has been developed, in which the velocity, temperature and humidity of the air approaching the heat exchanger can be controlled. The mass flow rate of the particles added to the air flow can be varied in order to achieve concentrations similar to those encountered in the field. Some of the findings of this work appear to directly contradict the perceptions within the industry. For example, the received wisdom has always been that flat fin heat exchangers fouled less than the more modern herringbone fin types. The results from experimental testing have shown that instead of being better, the flat fin heat exchanger fouls twice as fast as the equivalent herringbone fin heat exchanger. Propensity of various heat exchanger design geometries to foul have been quantified and empirically correlated, and a number of descriptive parameters defined. An empirical correlation for heat exchanger fouling due to large particles with surface geometry (related to fin geometry and fin density) has been developed.
机译：本文报告了对由大颗粒引起的热交换器结垢的研究。这种污垢是农业和非公路环境中的主要问题。已经发现，由大颗粒引起的结垢机理与由小颗粒引起的结垢机理根本不同。已经开发出实验设备，其中可以控制接近热交换器的空气的速度，温度和湿度。可以改变添加到气流中的颗粒的质量流率，以实现与本领域中遇到的浓度相似的浓度。这项工作的某些发现似乎与行业内的看法直接矛盾。例如，人们一直认为，扁平翅片换热器的结垢少于较现代的人字形翅片。实验测试的结果表明，扁平翅片换热器的阻垢速度不是更好，而是等效人字形翅片换热器的两倍。各种换热器设计几何形状易结垢的可能性已被量化并根据经验进行关联，并定义了许多描述性参数。已经开发了由于具有表面几何形状（与翅片几何形状和翅片密度有关）的大颗粒而导致的热交换器结垢的经验相关性。

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