Fluid A and Fluid $B$ are contacted using cocurrent flow in a shell and tube type heat exchanger. If the data tor tluids A and $B$ are as below, calculate the neat Hild A lost and the neat Huld $8$ gained in $kW.$ Also calculate the overall efficiency of the shell and tube type heat exchanger $(50$ points$).$

$F_A=3\frac{L}{m}in,T_{inA}=60C,T_{\text{o}\text{u}\text{t}A}=50\mathrm{.}1C,C_{p,A}$~$=4\mathrm{.}18k\frac{j}{k}g*C,{}_A$~$=989k\frac{g}{m^3}$

$F_B=3\frac{L}{m}in,T_{inB}=15\mathrm{.}2C,T_{\text{o}\text{u}\text{t}B}=19C,C_{p,B}$~$=4\mathrm{.}18k\frac{j}{k}g*C,{}_B$~$=998k\frac{g}{m^3}$