Milk enters into the heating section of a high temperature short time (HTST) pasteurization plant at a temperature of $45^{\circ} \mathrm{C}$ and leaves at $72^{\circ} \mathrm{C} .$ Hot water at temperature of $95^{\circ} \mathrm{C}$ enters countercurrently into the heat exchanger and leaves at $77^{\circ} \mathrm{C}$. The effectiveness of the heat exchanger is
(A) 0.18
(B) 0.36
(C) 0.54
(D) 0.84
Milk enters into the heating section of a high temperature short time (HTST) pasteurization plant at a temperature of $45^{\circ} \mathrm{C}$ and leaves at $72^{\circ} \mathrm{C} .$ Hot water at temperature of $95^{\circ} \mathrm{C}$ enters countercurrently into the heat exchanger and leaves at $77^{\circ} \mathrm{C}$. The effectiveness of the heat exchanger is
(A) 0.18
(B) 0.36
(C) 0.54
(D) 0.84