F-4 Design Fouling Resistances: Recommended Good Practice

J. M. Chenoweth

The specification of the fouling resistances to be used for the design of a heat exchanger can appreciably affect the amount of heat transfer surface required. There are many parameters that should be considered when selecting fouling resistances for any design. This report describes these parameters and their effect on the rate and extent of fouling. It further discusses the effect that fouling has on the performance of a heat exchanger. Possible approaches to the operation, cleaning, and the use of additives to lessen the impact of fouling are described. Finally, there is a discussion about the interpretation of the HTRI computer program fouling parameter printouts and their implication to sizing and operation of the heat exchanger being simulated.

Various sources of design fouling resistances are identified with some assessment of their basis. TEMA fouling resistances are discussed. And a strategy is suggested for selecting fouling resistances for uncertain services.