The larger the fouling factor is, the worse the test work condition is. In the actual process, the water quality of the air-conditioning water is good, but after using for a period, the surface will have dirt. The best source is from existing operating facilities. When production data is available, it can be used to calculate the actual fouling factors for the system. Together with the maintenance and cleaning history, this provides the best resource for selecting the fouling factors for a application.
The fouling factor of the chiller is F.F: 0.0001, which is often said to be one ten-thousandth of the fouling factor. This is a statement of the previous common engineering units in China, so the unit of 0.0001 is h.m2.c/kcal, which corresponds to the international unit 0.086m2.k/kw, and its corresponding unit is 0.0005h.ft2.F/Btu.
Ask the seniors about the fouling factor of some chillers. Our national standard is the water side fouling coefficient of 0.086m2 °C / KW, while the ARI standard is the evaporator: 0.0176m2 ° C / KW, the condenser 0.044m2 ° C / KW, which of the two standards is better? Is it good or small for the centrifuge? What is the reason?
Reason The thermal resistance becomes about 0.06. If 0.086 manufacturers are used, the actual cooling capacity will be larger. If the cooling capacity is 0.044, the cooling capacity will be too small. In other words, the security performance of 0.086 is higher.
You should first understand that the definition of "national standard is the water side fouling factor 0.086m2°C/KW" and the definition of "ARI standard is evaporator: 0.0176m2°C/KW, condenser 0.044m2°C/KW”, and the difference between them (are not only for the numerical differences). Manufacturers use a small fouling factor to make their heat exchangers more competitive in the market.
If you use a large fouling factor and others choose small one, your heat exchanger will do a lot and the cost will go up. Would you say that it would be worthwhile? However, the water quality in actual use is difficult to control and it is easy to scale. The actual fouling rate is different for each application.
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