please do a. and b.

A type-302 stainless steel tube of inner and outer diameters Dd=22mm and D0=27mm, respectively, is used in a cross-flow heat exchanger. The fouling factors, Rf, for the inner and outer surfaces are estimated to be 0.0004 and 0.0002m2,KN, respectively. For the figure shown below, Tw,1=75C,um,=0.5m/s,Vo=20m/s, and To=15C. (a) Determine the overall heat transfer coefficient based on the outside area of the tube, U,, in W/m2K.. (b) Instead of air flowing over the tube, consider a situation for which the cross-flow fluid is water at 15C with a velocity of V0=1 m/s. Determine the overall heat transfer coefficient based on the outside area of the tube, U0, in W/m2,K