Hot fluid at enters the tube side of a counter current shell and tube heat exchanger at 93°C and leaves at 40°C. Cold fluid 800 kg/min with a specific heat of 2.5 kJ/kg.K enters at 20°C and leaves at 46°C. Specific heat of hot fluid is 4.184 kJ/kg.K. The log mean temperature difference in °C is approximately a.36.39 b.16.49 c.31.60 d.-31.60

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