Water (Cp = 4.18 kJ/kg.K) entering a counter flow heat exchanger at 20°C is to be heated to 60°C by an oil (Cp =2.1 kJ/k

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Water (Cp = 4.18 kJ/kg.K) entering a counter flow heat exchanger
at 20°C is to be heated to 60°C by an oil (Cp =2.1 kJ/kg.K). The
oil enters at 100 °C and leaves at 70°C. If the water flow rate is
XX kg/min (read the instructions below) and the heat exchanger area
is 25 m2 , determine: a) the logarithmic temperature difference and
b) the overall heat transfer coefficient of this heat exchanger.
USE the LMTD method to solve the problem. Write down all your
assumptions. INSTRUTION: By XX use:
a) The two last digits of your student number if they are equal
or greater than 50, example S00000050 then XX=50
b) The two last digits of your student number plus 50 if they
are less than 50, example S00000049 then XX=49+50=99