To cool the lubricating oil, a concentric counter-flow heat exchanger (see Figure Q1) is utilized, with the water flowing via an internal pipe with an internal diameter of 0.02 m and a flow rate of...

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Question (b)

Extracted text: To cool the lubricating oil, a concentric counter-flow heat exchanger (see Figure Q1) is utilized, with the water flowing via an internal pipe with an internal diameter of 0.02 m and a flow rate of 0.18 kg/s. The intake and output oil temperatures are 95°C and 65°C, respectively, as the oil runs through the outer annulus (0.04 m) at a flow rate of 0.12 kg/s. The water enters the heat exchanger at a temperature of 30°C. Stating all the necessary assumptions, (b) Considering the effect of fouling during operation through time and the heat transfer resistance would be affected, discuss the design and operation considerations to minimize the fouling problem on the opertion of the heat exchanger during design and operation stages. Consider average value of Engine oil property: C-2131 JM/kg°C; µ=0.0325 Ns/m?; K=0.138 W/m°C Consider average value of water properties: Cy-4174 J/kg°C; u=725x 10-6 Ns/m?; K=0.138 W/m°C; Pr=4.85 Annulus Oil Inner tube d, = 40 mm d, = 20 mm Water Oil Figure Q1