For a double pipe counter flow heat exchanger with \(\rm \frac{C_{Min}}{C_{Max}}=1\), the effective of heat exchanger is

1
\(\rm 1+\frac{1}{NTU}\)
2
\(\rm \frac{NTU}{NTU-1}\)
3
\(\rm \frac{NTU}{NTU+1}\)
4
\(\rm \frac{1+NTU}{1-NTU}\)

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