本研究的目的是为灰尘环境中热交换器的实验评估制定参考试验粉尘和试验程序，并分析颗粒污染对四台热交换器在加热和冷却模式下性能的影响。从几种市售粉末中选择参考试验粉尘，对翅片管式换热器的空气侧颗粒污染性能进行试验评估，包括颗粒尺寸分布、密度和材料成本。四种不同翅片密度和形状的换热器在加热和冷却模式下进行了实验测试，分别使用颗粒质量中值直径（MMD）为14.5微米的Masons水合石灰石粉和颗粒质量中值直径（MMD=1067微米）大得多的低成本有机测试粉尘。实验结果表明，空气的影响- 侧面颗粒物污垢对换热器性能的影响主要归因于气流阻力的增加，而由此产生的热阻增加所起的作用不太显著。当换热器用于在含有悬浮石灰石粉末的环境中加热空气时，换热器的气流阻力将逐渐增加，在4小时的强化试验中，从初始状态增加约2.1%到6.7%。在此期间，翅片表面的热导率只会略微降低。然而，当使用有机测试粉尘时，热交换器会很快堵塞，气流阻力会在11.4到76.8分钟内翻倍，同时气流保持恒定。翅片密度较高的换热器堵塞速度更快，压降增加速度更快。当热交换器在冷却模式下使用时，冷凝的存在会产生灰尘/水泥浆，沉积在冷却盘管内，导致气流阻力更快地增加。 在这些冷却试验中，使用有机试验粉尘，气流阻力在运行7.6到21.6分钟内翻倍，比相应的加热情况快50%到260%。当冷却盘管暴露于雾化石灰石粉时，气流阻力的增加速度与有机试验粉尘的情况相当。在我们的实验中，由于颗粒物污染导致的换热器性能降低主要表现为空气侧流动阻力增加，而翅片表面绝缘颗粒物沉积层的传热阻力增加在性能降低中所起的作用较小。引文:ASHRAE Transactions，第118卷，第一部分，伊利诺伊州芝加哥

The purpose of this study was to develop reference test dusts and test procedures for experimental evaluation of heat exchangers in dusty environments and analyze the impact of particulate fouling on the performance of four heat exchangers in both heating and cooling modes. Reference test dusts were chosen among several types of commercially available powders for experimental evaluation of air-side particulate fouling performance of fin-and-tube heat exchangers with respect to particle size distributions, density, and material cost. Four heat exchangers of varying fin densities and shapes were experimentally tested in both heating and cooling modes with Masons Hydrated Limestone powder with a particle mass median diameter (MMD) of 14.5 micrometer and a low cost organic test dust with a much larger particle mass median diameter (MMD=1067 micrometer), respectively. The experimental results showed that the impact of air-side particulate fouling on the performance of a heat exchanger is mainly attributed to increased airflow resistance, while the resulting increase in thermal resistance played a less significant role. When a heat exchanger was used to heat air in an environment with aerosolized limestone powder, the airflow resistance across the heat exchanger would increase gradually, on the order of 2.1% to 6.7% from the initial state in a four-hour intensive test. During this time, the thermal conductivity of the fin surfaces would degrade only slightly. However, when the organic test dust was used, the heat exchangers would clog quickly and the airflow resistance would double in 11.4 to 76.8 minutes while the airflow was held constant. Heat exchangers with higher fin densities clogged much more quickly and led to a faster rate of pressure drop increase. When the heat exchangers were used in a cooling mode the presence of condensation created a dust/water slurry that deposited inside the cooling coils, causing the airflow resistance to increase more rapidly. With the organic test dust in these cooling tests, the airflow resistance doubled within 7.6 to 21.6 minutes of operation, which is 50% to 260% faster than their corresponding heating cases. When cooling coils were exposed to aerosolized limestone powder, the airflow resistance increased at rates comparable to the cases with the organic test dust. In our experiments, the reduction of heat exchanger performance due to particulate fouling was primarily observed as an increased air-side flow resistance, while increased resistance to heat transfer by an insulating particulate deposition layer on fin surfaces played a lesser role in performance degradation.