The effectiveness (s) of the condenser is.

Question

Saturated vapor is condensed to saturated liquid in a condenser. The heat capacity ratio is $C_{r}=\frac{C_{min}}{C_{max}}.$  . The effectiveness (s) of the condenser is.   

      (a) $\frac{1-exp\left [ -NTU\left ( 1+C_{r} \right ) \right ]}{1+C_{r}}$ 

      (b) $\frac{1-exp\left [ -NTU\left ( 1+C_{r} \right ) \right ]}{1-C_{r}exp\left [ -NTU\left ( 1-C_{r} \right ) \right ]}$ 

      (c) $\frac{NTU}{1+NTU}$ 

      (d) 1–exp(–NTU)

Answer 1

B is the right answer for effectiveness of counter flow heat echanger. while for condensor with counter flow and saturated steam. am not sure this method can be applied. if anyone can help, plz do so.