$8-30.$ A $2\mathrm{.}5$ m $-$long coaxial$-$tube heat exchanger consists of a $6\mathrm{.}38$ mm $-$O$.$D$.,4\mathrm{.}5250$ mm$-$I.D$.$ brass tube surrounded by a $9\mathrm{.}63mm-$ I.D$.$ glass tube. The heat exchanger is tested in a laboratory with hot water inside the inner tube and cold water in the annulus. In a counterflow test the following data were recorded:

$m_C^{}=0\mathrm{.}121k\frac{g}{s}$;$T_{Cin}=23\mathrm{.}5C$;$T_{C\text{o}\text{u}\text{t}}=30\mathrm{.}0C$

$m_H^{}=0\mathrm{.}0562k\frac{g}{s}$;$T_{Hin}=44\mathrm{.}8C$;$T_{H\text{o}\text{u}\text{t}}=31\mathrm{.}3C$

Compare the effectiveness obtained in the test with the expected value.