Saturated vapor is condensed to saturated liquid in condenser. The heat capacity ratio is \({C_r} = \frac{{{C_{min}}}}{{{C_{max}}}}\). The effectiveness (ε) 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. \({{1 - \exp \left[ { - NTU} \right]}}\)