Atube-in-tube heat exchanger is used to cool engine oil by transforming heat to a flow of 40% ethylene glycol-water solution. the engine oil enters the heat exchanger at th, in= 85°c and flow through the annular space that is formed between the inner and outer tubes while the ethylene glycol flows through the inner tube. the total length of the heat exchanger is l = 12.1 m and the inner tube made of 304 stainless steel with outer diameter do = 1.0 cm and the wall thickness of 1.1 mm. the heat transfer coefficient between the engine oil and the inner tube surface is 350 w/m2-k. the ethylene glycol enters the heat exchanger at tc, in= 22°c and flows through the center tube in a counter-flow configuration with a mass flow rate of 0.012 kg/s. the fouling factor associated with the flow of the engine oil is 0.000179 k-m2/w and the fouling factor associated with the ethylene glycol is 0.00043 k-m2/w. determine the conductance (ua) of the heat exchanger