这项工作是在ASHRAE RP-560下进行的。该计划的目的是确定浸没式制冷剂蒸发器所用管道水侧的潜在污垢。该项目分两部分进行。该计划的第1部分涉及现场取样和分析，以确定冷水机组蒸发器中使用的水质。从位于美国大陆31个城市的71台冷水机中采集水样。每个采样点都填写了问卷。它提供了有关冷水机组安装、冷冻水系统、运行状况和维护实践的信息。收集的样本由水处理公司进行分析。然后将结果输入计算机数据库。对水质数据进行分析，以推断建筑物使用、冬季供暖、缓蚀剂使用、地理位置和水软化等因素对污垢的影响。 表中列出了所有污垢指示器的重要统计参数。建立了数据解释的统计模型。该模型用于评估冷冻水对各种污垢机理的潜在影响。定义了指示污垢可能性的阈值。第一部分工作的结果发表在韦布、R.L.、海德尔、S.Imam和梅茨，A.，“水质调查及其对冷水机蒸发器污垢的影响”，ASHRAE Transactions，第97卷，Pt。1，第55-67页，1991年。该计划的第2部分涉及一项实验研究，以测量在约45°E温度下运行的冷水机组浸没式蒸发器管内的污垢热阻。污垢热阻测量是在一个专门设计的测试蒸发器12中进行的。 6英尺长，包含16根管子，与现有的250吨R-ll制冷机蒸发器并联。测试蒸发器使用的水与流经250吨蒸发器管的水相同。来自250吨蒸发器的制冷剂在测试蒸发器管的外表面上沸腾。采集了两组污垢数据，一组用于1990年的冷却季节（5月至10月），另一组用于1991年的冷却季节。数据取自一个内部平面和三个内部增强管几何形状。将每根管子的污垢阻力与每周手动刷两次的同一根管子的污垢阻力进行比较。在第一年，数据是在正常水质下以3.5英尺/秒的水流速度采集的。在第二年，数据是在污水质量为3的情况下采集的。 5和7.0英尺/秒的水流速度。对数据进行分析，以确定在两个冷却季节中获得的污垢阻力。两个冷却季节的结果表明，蒸发器管中的污垢可以忽略不计。第2部分工作的结果发表在S.Imam和Webb，R.L.“浸没式冷水机组蒸发器管侧污垢阻力的实验研究”上，ASHRAE交易，第98卷，Pt。1, 1992.

This work was conducted under ASHRAE RP-560. The objective of the program was to determine the potential for fouling on the water-side of tubes used in flooded refrigerant evaporators. The program was conducted in two parts. Part 1 of the program involving field sampling and analysis to determine the water quality used in water chiller evaporators. Water samples were taken from 71 chillers located in 31 cities across the continental U.S. A questionnaire was filled out for each sampling site. It provided information regarding the chiller installation, chilled water system, operating profile and maintenance practices. The collected samples were analyzed by water treatment companies. The results were then entered into a computer database. The water quality data were analyzed to infer the fouling potential as a function of building use, winter heating, use of corrosion inhibitor, geographic location and water softening. Important statistical parameters of all the fouling indicators were tabulated. A statistical model was developed for the data interpretation. The model was applied to assess the potential of chilled water for various fouling mechanisms. Threshold values, which indicate the potential for fouling, were defined. The results of the Part 1 work were published in Webb, R. L., Haider, S. Imam, and Meitz, A., "A Survey of Water Quality and Its effect on Fouling in Water Chiller Evaporators," ASHRAE Transactions, Vol. 97, Pt. 1, pp. 55-67, 1991. Part 2 of the program involved an experimental study to measure the fouling thermal resistance in the tubes of water chiller flooded evaporators operating at approximately 45° E The fouling resistance measurements were made in a specially designed test evaporator 12.6 ft long containing 16 tubes that was connected in parallel with an existing 250 ton R-ll chiller evaporator. The test evaporator used the same water that flowed through the tubes of the 250 ton evaporator. Refrigerant from the 250 ton evaporator was boiled on the outer surface of the test evaporator tubes. Two sets of fouling data were taken, one for the 1990 cooling season (May through October) and one for the 1991 cooling season. The data were taken for one internally plain and three internally enhanced tube geometries. The fouling resistance of each tube was compared with that of an identical tube, which was manually brushed twice weekly. During the first year, the data were taken with normal water quality at 3.5 ft/sec water velocity. During the second year, the data were taken with dirty water quality at 3.5 and 7.0 ft/sec water velocities. The data were analyzed to determine the fouling resistance obtained in each of the two cooling seasons. The results for two cooling seasons show that negligible fouling will occur in the evaporator tubes. The results of the Part 2 work were published in S. Imam, and Webb, R.L., "An Experimental Study of Tube-side Fouling Resistance in Flooded Water Chiller Evaporators, "ASHRAE Transactions, Vol. 98, Pt. 1, 1992.