Finned heat exchanger
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Experts, for finned heat exchangers that use hot water to heat air, what value should be used for the heat transfer coefficient?
There is a corresponding heat exchanger section; I’ll transfer you there, as it’s more professional there!
This requires knowing all your parameters: wind speed, the size of the face facing the wind, and the aspect ratio; detailed calculations are needed, involving many formulas
There are endless changes; your conditions are far from sufficient.