HEAT TRANSFER: HEAT EXCHANGER Oil flows in a heat exchanger with a mass flow rate of...

HEAT TRANSFER: HEAT EXCHANGER

Oil flows in a heat exchanger with a mass flow rate of 20 kg/s and is to be cooled from 175 to 65°C with water as a coolant flowing at a rate of 30 kg/s and an inlet temperature of 12°C. The overall heat transfer coefficient is U = 1250 W/m²⋅K.

a) Sketch the temperature profile and calculate the mean temperature for parallel flow, counter flow, and cross flow heat exchangers..

b) Determine the area required to sustain the heat transfer for each heat exchanger stated in (a) Comment on your answer.

c) If fouling with thickness of 2 mm happens on the tubes side, determine the new heat transfer coefficient and evaluate the effectiveness of a 45 m length counter flow heat exchanger before and after fouling. Specific heat capacity of oil and water is given as c_{p, oil} = 2058 J/kg⋅K and c_{p, water} = 4184 J/kg⋅K. Conductivity of fouling is taken as k_f,I = 11 W/m⋅K.

Expert Solution

Amanda K answered 1 month ago

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