Expert ForumsHeat Transfer

Topic: Re: Is there an easy formula to calculate the wet heat transfer coefficient?

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The conservative manner is to assume a gas only coefficient throughout. However, if you wish to be more accurate, the unit should be evaluated in the de-superheating regime (80%-100% humidity) and then using a wet surface coefficient for the remainder of the unit. 
The following articles discuss this topic:
Determination of apparent heat transfer coefficient by condensation in an industrial finned-tube heat exchanger: prediction Experimental and computational performances of heat exchangers functioning in wet regime by using the film method.