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Heat Exchanger Design Question: In a Cross-Flow heat exchanger, is "R" dependent on the number of...

Heat Exchanger Design Question:
In a Cross-Flow heat exchanger, is "R" dependent on the number of tubes in the exchanger?
If so, what formula could be used to determine R?

R is the total thermal resistance
if it is the total, would the number of tubes need to be taken into account?
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