A parallel-flow concentric tube heat exchanger (alike the one given in the figure) is used for engine cooling. The total heat transfer surface area of the exchanger is 5 m. During a test run, engine oil flowing at 0.1 kg/s is cooled from 380 K to 340 K by water supplied at a temperature of 300 K and a flow rate of 0.2 kg/s. By using your open resources (for finding properties of fluids and relevant empirical formulas for inner tube and annulus part of the concentric tube); a) Check consistency of the values of the overall convection coefficient (U) to be calculated by the logarithmic temperature difference method directly and to be calculated by using suitable convection heat transfer coefficients from the relevant empirical formulas; b) Re-evaluate the consistency with the same approach for counter-flow concentric tube heat exchanger case? NOTE: Please use your own judgements/assumptions when selecting suitable empirical formulas to calculate convection heat transfer coefficients for concentric tube. 90- Tum Ti 97 Tso