iPad 8:30 PM OUTSIDE PROBLEM A double-pipe heat exchanger is constructed of a stainless steel (k=15.1 W/am.K) inner tube of D = 1.5 cm and outer diameter D = 1.9 cm and an outer shell of inner diameter 3.2 cm. The convective heat transfer coefficient is given to be h₁ = 800 W/m².K on the f,i 0 f,o 2 1 inner surface of the tube and h = 1200 W/m².K on the outer surface. For a fouling factor of R= 0.0004 m².K/W on the tube side and R = 0.0001 m².K/W on the shell side, determine (a) the thermal resistance of the heat exchanger per unit length and (b) the overall heat transfer coefficients, U, and U based on the inner and outer areas of the tube, respectively. 0 82%