The pipe in Figure 2 is used to transport a cold fluid at Twi=10C and conviction coefficient (hi) = 200W/m2K. If the inner diameter of the pipe (Di) =20mm, and the outer diameter (D)=23mm, and the hot fluid is at Tm=350K and conviction coefficient (ho)=20W/m2K, Determine: a) The heat gained by the cold fluid per unit tube length if 10mm thick insulation layer with thermal conductivity (k)=0.1 W.m.K is applied. (15 points) b) The heaf gained by tho cold fiuid per unit tube length if the insulation layer was removed. ( 10 points)