Problems with finned tube heat exchangers
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I need to calculate the overall heat transfer coefficient of a finned tube heat exchanger. The formulas I found online are extremely complex; moreover, it is necessary to decide whether to use the outer surface of the bare tube as the reference or the outer surface including the fins. Can the usual formulas used for calculating heat exchangers be applied? In which sources can I find specific formulas for finned tubes? It would be great if formulas for the convective heat transfer coefficients inside and outside the tubes were included as well. Thank you very much to all the experts
This should be considered a technical secret, right? Heat exchange software makes money based on this formula