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Chemical and Process Engineering Resources

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Category: Heat Transfer Technology
Question: Are shell and tube exchangers using 3/4" tubes always cheaper that an exchanger with 1" tubes?
Keywords: shell,tube,heat,transfer,exchangers,tube,size,cost,price
Answer: There is an exception to the rule that a shell and tube heat exchanger service using 3/4 inch tubes will be cheaper than one using 1 inch tubes.This is when the tubeside has a much lower heat transfer coefficient than the outside of the tubes and the following conditions are present: The flow will be in laminar flow if two(2) tube passes are used. If four(4) tube passes are used, the tubes in the 3/4 inch selection will have to be significantly shorter than allowed in order to meet pressure drop. On the other hand the 1 inch tube design uses the full allowable tube length. Source: Gulley Computer Associates