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[GREGORY]

Dear all,

The relation : Preversed(R, NTU)=P(-R,NTU)/[1+RP(-R,NTU)] give the thermal effectiveness of a heat exchanger (defined by P, R and NTU) when you reverse the flow of one of the two fluids. I know that this relation is valid if thermal properties are temperature independent and one of the flow is mixed.
My question is : is this relation still valid in the case of multi-passes on both sides (sheel side and tube side)?

Thanks in advance.

Gregory