What is fouling in heat exchangers


 What is fouling in heat exchangers?

          

        Contamination is the accumulation of unwanted material on the surfaces of the heat exchanger tubes. After a period of operation, the heat transfer surface of the heat exchanger can be covered with various deposits that occur in the fluid system. This layer is an additional resistance to heat flow and therefore reduces performance. Pollution factors are best determined based on experience with similar units in the same or similar service. If such information is not available, it may be necessary to publish data. The most comprehensive table on pollution factors is the one developed by TEMA, which is available from Ref. Contamination can occur through various mechanisms that work alone or in combination. 

  • Corrosion:

          Corrosion products such as rust can gradually build up on tube walls, resulting in reduced heat transmission and eventual tube failure. This type of fouling can be minimized or eliminated by the proper choice of corrosion-resistant materials of construction in the design process.


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