Repeat Problem 8.3, but assume that fouling factor of 0.0009 (m2 K)/W on the inside and 0.0004

Question:

Repeat Problem 8.3, but assume that fouling factor of 0.0009 (m2 K)/W on the inside and 0.0004 (m2 K)/W on the outside respectively have developed.From Problem 8.3: A light oil flows through a copper tube of 2.6 cm ID and 3.2 cm OD. Air is flowing over the exterior of the tube. The convection heat transfer coefficient for the oil is 120 W/(m2 K) and for the air is 35 W/(m2 K). Calculate the overall heat transfer coefficient based on the outside area of the tube(a) Considering the thermal resistance of the tube,(b) Neglecting the resistance of the tube.GIVENAir flow over a copper tube with oil flow within the tubeTube diametersInside (Di) = 2.6 cm = 0.026 mOutside (Do) = 3.2 cm = 0.032 mConvective heat transfer coefficientsOil (hi) = 120 W/(m2 K)Air (ho) = 35 W/(m2 K)Fouling factorsInside (Rdi) = 0.0009 (m2 K)/WOutside (Rdo) = 0.0004 (m2 K)/WASSUMPTIONSUniform heat transfer coefficientsVariation of thermal properties isnegligible