QUESTION $5$

$[25$ Marks$]$

A concentric tube heat exchanger with an area of $50m^3$ operating under the following condtions:

Data;

Heat capacity for hot fluid $=6k\frac{W}{K}$

Heat capacity for cold fluid $=3k\frac{W}{K}$

Hot fluid inlet temperature $=70C$

Cold fluid inlet temperature $=30C$

Hot fluid outlet temperature $=.$

Cold fluid outlet temperature $=60C$

i$.$ Calculate the outlet temperature of hot stream.

$[5$ Marks$]$

ii$.$ From the given information, determine the possible flow configuration the heat exchanger is operating in$.$

ii$.$ Determine the overall heat$-$transfer coefficient.

$[5$ Marks$]$

$[5$ Marks$]$

iv$.$ Calculate the effectiveness of the heat exchanger.

$[5$ Marks$]$

v$.$ Predict the effectiveness of this heat exchanger if it length were greatly increased.

$[5$ Marks$]$